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CatalogIntroductionⅠ AAAA Battery Basics    1.1 What is the AAAA Battery?    1.2 Types of the AAAA Battery    1.3 The AAAA Battery UsageⅡ AAAA Battery Features, Specifications and Replacement    2.1 Features of the AAAA Battery    2.2 Technical Specifications of the AAAA Battery    2.3 Non-Rechargeable AAAA Battery    2.4 Rechargeable AAAA BatteryⅢ 4 Benefits of Powerful AAAA Battery    3.1 They Have a Great Power Output    3.2 They’re Excellent for Practical Everyday Use    3.3 AAAA Batteries are Environmentally Friendly    3.4 They Have a Durable, Heavy-Duty StructureⅣ The Best 4 Types of the AAAA Battery for You to Choose    4.1 What to Look for in AAAA Batteries    4.2 Best Overall: Energizer AAAA Alkaline Batteries    4.3 Best Value: AAAA High-Performance Alkaline Batteries    4.4 Best Rechargeable: EBL Individual Smart Battery Charger with 4 Pack AAAA Rechargeable Batteries    4.5 Streamlight Stylus AAAA Replacement BatteriesⅤ An AAAA Battery Can't Replace 2 AA BatteriesⅥ FAQ1. What is the AAAA Battery Equivalent?2. Where to Buy AAAA Batteries?3. What is the AAAA Battery Used for?4. What are the Differences Between AAAA and AAA Batteries?5. Are A23 and AAAA Batteries the Same?6. Are E96 batteries AAAA?7. Can I Use AAA Battery Instead of AAAA?8. Where Can I Buy AAAA Batteries?9. How Much does the AAAA Battery Cost?10. How Long can AAAA Batteries Last When Unused? 11. Are the 18650 and AAAA Batteries the Same thing?12. What are the Best Rechargeable AAAA Batteries?13. How to Install the AAAA Battery in Your Device?14. What is the Smallest Battery?IntroductionThe AAAA battery (also known as quadruple-A) is 42.5 mm long and 8.3 mm in diameter. The alkaline cell weighs about 6.5 g and produces 1.5 V. This size battery is also known as R8D425 (IEC) and 25 (ANSI/NEDA). This size alkaline battery is also known as Duracell type number MN2500 or MX2500, and Energizer type number E96.This article will tell you all you need to know about the AAAA battery.video:show the free AAAA batteryⅠ AAAA Battery Basics1.1 What is the AAAA Battery?The AAAA battery is a tiny cylindrical cell alkaline battery. The AAAA battery is a reasonably common battery that is manufactured by a variety of prominent companies like Duracell, Atomic, Energizer, and others. Smaller firms and private label battery manufacturers also produce a lot of AAAA batteries. Other businesses make batteries that are comparable in size to the AAAA but have various names and capacities.1.2 Types of the AAAA Battery Zinc–carbonAlkalineNiCdNiMHLi-ionIEC nameR8D425LR8D425KR8D425HR8D425 ANSI/NEDA name25D25A   Typical capacity300 mAh500–600 mAh 325–500 mAh160–170 mAhNominal voltage1.50 V1.50 V1.25 V1.25 V3.7 V1.3 The AAAA Battery UsageAAAA batteries are widely popular and are ideal for applications that require a small but stable battery. The following are some instances of AAAA usage.Medical Devices and InstrumentsCalculatorDigital ThermometerLaser PenSecurity System PanelFlashlightElectronic ToysBattery Pack Application Smoke Detectors Memory BackupA 9-volt battery is opened to reveal six LR61 cells, which are comparable to AAAA batteries.These batteries are not as popular as AAA or AA batteries and, as a result, are not as widely available.Some alkaline nine-volt battery versions have six LR61 cells joined by welded tabs. These cells are comparable to AAAA cells and can be used in some devices in their place, although being 3.5 millimeters (0.14 in) shorter.Ⅱ AAAA Battery Features and SpecificationsAAAA batteries are small, cylindrical batteries that are widely found in small electronic devices such as calculators, flashlights, laser pointers, game consoles, and others.AAAA batteries, like similar but bigger AA and AAA batteries, are available in a variety of chemistries, each with its own set of performance and features, as well as a range of pricing.2.1 Features of the AAAA BatteryAAAA batteries have physical dimensions of 8.3 x 42.5 mm (0.3268 x 1.6732 inches) and are extremely similar to:AAA battery dimensions (D x H): 10.5 x 44.5 mm,AA battery dimensions (D x H): 14.5 x 50.5,except for the AAAA, which is often smaller and longer/thinner.AAAA batteries have numerous labels, including LR8D425 (alkaline, IEC standard),  KR8D425 (NiCd, IEC standard), R8D425 (zinc-carbon, IEC standard), 25A (ANSI standard), HR8D425 (NiMH, IEC standard), MX2500, LR61, Mini, and many others, but almost all manufacturers use the 'AAAA' label to avoid any confusion.Note: Although the true LR61 battery is slightly shorter (3.5 mm, 0.14 inches) than the AAAA battery, several manufacturers identify their AAAA batteries as LR61 batteries. LR61 batteries are rarely used on their own; instead, they are frequently combined to make bigger batteries, such as 6V (4LR61) and 9V (6LR61) batteries.The chart below lists the most common chemical types of AAAA batteries:ChemistryZinc-CarbonAlkalineNickel-CadmiumNickel Metal HydrideLithium-IonRechargeableNoNoYesYesYesTypical Voltage1.5 V1.5 V1.2 V1.2 V3.6 VTypical Capacity300 mAh400 - 600 mAh200-400 mAh350 - 500 mAh170 mAh2.2  Technical Specifications of the AAAA BatteryAAAA Battery Nominal Voltage1.50 VoltsCapacity≈  500-600mAhOperating Temperature0°C – 60°C Diameter8.3mmHeight42.5mmChemistryAlkaline 2.3 Non-Rechargeable AAAA BatteriesNon-rechargeable alkaline AAAA batteries with a nominal voltage of 1.5 volts and a capacity of 400-600 mAh, or even more, are the most prevalent.The actual capacity is determined by the discharge current as well as other discharge parameters. The Energizer AAAA battery, for example (PDF datasheet, opens in a new window), has a capacity of:250 mAh when discharged with 300 mAh current325 mAh when discharged with 200 mAh current475 mAh when discharged with 100 mAh current680 mAh when discharged with 10 mAh currentAlthough zinc-carbon AAAA batteries are less expensive than alkaline AAAA batteries, most manufacturers choose alkaline AAAA batteries due to their superior performance, which includes a more steady output voltage, greater capacity, and longer shelf life (up to 5 years).2.4 Rechargeable AAAA BatteriesNickel Cadmium (NiCd), Nickel Metal Hydride (NiMH), and Lithium-ion batteries are the most common rechargeable AAAA batteries.Because cadmium is a heavy metal and a harmful contaminant, nickel-cadmium (NiCd) AAAA batteries are rarely used anymore.NiCd batteries have a very low internal impedance and can easily provide high currents. They do, however, have a relatively high self-discharge rate, a very strong memory effect, fewer charging/discharging cycles than NiMH batteries, and a lower overall capacity.Furthermore, both NiCd and NiMH batteries have a nominal voltage of 1.2 volts; several devices designed for 1.5V zinc-carbon or alkaline batteries do not function consistently when powered by 1.2 volt NiCd and/or NiMH cells.Actual capacity varies depending on discharge conditions and battery age, although it is often less than that of NiMH batteries.NiMH batteries are preferred over NiCd batteries due to advances in chemistry and the fact that NiCd batteries contain cadmium.Nickel Metal Hydride (NiMH) batteries can withstand more charging/discharging cycles than NiCd batteries and have virtually no memory effect. Furthermore, NiMH batteries have a lower self-discharge rate and a higher capacity.NiMH batteries are the preferred 1.2-volt chemistry for AAAA (and other) batteries since they do not contain hazardous heavy metals.Ⅲ 4 Benefits of Powerful AAAA BatteryFinding AAAA batteries that suit a compact device is one thing, but do they give enough power and lifespan for your needs?It's always inconvenient to have to replace batteries after such a short length of time. That is why it is recommended to seek out the highest quality possible.AAAA batteries (also known as Quadruple-A or LR61) are smaller than the more common AAA and AA types. They power small devices like LED penlights, glucose meters, laser pointers, headphone amplifiers, and powered computer styluses.Despite their small size, they can pack up to 1.5 volts of power in a slender cylindrical cell that is 42.5 mm in length and 8.3 mm in diameter.See how the AAAA alkaline battery compares to other models in terms of general characteristics: Battery TypeLengthDiameterUsesAAAA42.5 mm8.33 mmLaser pointers, LED pen lights, styluses, etc.AAA 44.5 mm10.5 mmTV remotes, cameras, MP3 players, Bluetooth, etc.AA 49.2 mm–50.5 mm13.5 mm –14.5 mmToys, remote controls, clocks, etc.C50 mm26.2 mmTorches, toys, etc.D61.5 mm33.2 mmLarge torches, transistor radios, etc.F91mm33mmHigh current devicesNow that you're more acquainted with quadruple-A battery cells, let's look at the advantages of these little yet important power sources.3.1 They Have a Great Power OutputThe alkaline battery technology utilized in quadruple-A battery cells has a capacity of 500–600 mAh, with non-rechargeable variations having a much lower discharge rate.This implies they can be used for extended periods in electrical equipment, particularly those that consume minimal amounts of power.According to a comprehensive study conducted by Battery University, alkaline-based batteries often have lower discharge currents, resulting in long-lasting performance over their usage period.AAAA alkaline batteries are normally made to last a long time. The addition of graphite, zinc, and manganese in the manufacturing process increases the density of each cell. This allows them to deliver tremendous power even at nominal voltage.3.2 They’re Excellent for Practical Everyday UseMost current electronic devices now come with built-in rechargeable batteries.This is excellent, however, when the battery pack needs to be replaced, it becomes more difficult. This is a headache that may be easily avoided by using AAAA alkaline batteries, which are inexpensive and quick to replace.ConvenienceRemovable batteries offer an advantage over chargeable types in that they can be used in situations where energy is not accessible.If you're out camping and your torch runs out of juice, a quick battery replacement will have you back up and running in no time.Because rechargeable battery choices for many products are still unavailable, the AAAA battery remains relevant and handy in everyday life.AvailabilityAAAA batteries may be more difficult to locate because they are utilized in specialized applications, but they are still generally available both online and offline.Because of our extensive range of powerful batteries, we are Australia's leading provider of high-quality replaceable cells.3.3 AAAA Batteries are Environmentally FriendlyMercury, a heavy element known to harm the environment, is no longer present in modern AAAA dry cells.The packing is done with care, using biodegradable cardboard and as little plastic as possible. This is following consumer product environmental safety norms.When delivered, the safe and environmentally friendly blister pack retains the cells in place and prevents any inappropriate contact.The batteries also come in high number packs that are both cost-effective and environmentally friendly.Consumers are recommended to properly dispose of batteries to avoid undue pollution of land or water resources.The mercury-free cells also contain recyclable ingredients that may be used to make new battery components.  3.4 They Have a Durable, Heavy-Duty Structure  Quadruple-A cells are designed to survive harsh environmental conditions. For example, the average battery cell can endure temperatures ranging from -18 C to 55 C.The batteries' outside casings are constructed with a unique coating that reduces contact resistance for increased reliability. The sturdy design allows them to operate in a variety of situations and power specialty devices adequately, even under harsh conditions.This implies that whether you live in a tropical or frigid climate, you will always have optimal performance.Good quality batteries have a long shelf life and can be stored for up to 7 years without losing capacity.The manufacturers' quality assurance ensures efficient energy output throughout the battery's lifespan.Ⅳ The Best 4 Types of the AAAA Battery for You to Choose If you've ever used a little electronic device, such as a laser pointer, an electronic stylus, or a glucose meter, you've probably benefited from the power of the AAAA battery. However, replacing these batteries is not always simple because they are far more difficult to come by than other, more common ones. We created this list to make your search for AAAA batteries easier by highlighting the top ones on the market right now.3.1 What to Look for in AAAA BatteriesThe battery life will be critical. Another crucial factor to consider is shelf life, especially if you intend to buy extra batteries to store for later use. Battery purchases can add up over time, so consider using rechargeable AAAA batteries as a cost-saving option, especially if you don't mind their shorter battery life per charge.3.2 Best Overall: Energizer AAAA Alkaline BatteriesThese Energizer AAAA Alkaline Batteries have the longest battery life and are the most trustworthy AAAA batteries available. They're suitable for smart pens and other small electronics that require a consistent voltage output for long-term functionality. They also have a longer shelf life than most budget AAAA battery options, making them an excellent choice if you intend to store batteries for future use.3.3 Best Value: AAAA High-Performance Alkaline BatteriesAAAA High-Performance Alkaline Batteries provide 1.45 volts of dependable, long-lasting power and have a 3-year shelf life. These batteries are available in four- or eight-packs and are superior to other inexpensive AAAA battery options, even giving top-tier AAAA battery supplies a run for their money. They are also leak-proof and carefully sealed for further security.3.4 Best Rechargeable: EBL Individual Smart Battery Charger with 4 Pack AAAA Rechargeable BatteriesThe EBL Individual Smart Battery Charger with 4 AAAA Rechargeable Batteries is a terrific alternative for individuals looking for quality AAAA rechargeable batteries and a versatile charger to keep them operational. When compared to other rechargeable manufacturers, the 400-mAh AAAA batteries may be recharged over 1,000 times. The charger is also compatible with AA and AAA rechargeable batteries and includes several useful safety measures.3.5 Streamlight Stylus AAAA Replacement BatteriesThe Streamlight Stylus AAAA Replacement Batteries are an excellent choice for people looking for AAAA batteries to power an electronic stylus or penlight. These batteries last a long time and are dependable, especially given their low price. These batteries are particularly ideal for cameras and medical devices, and they work well in cold climates.Ⅴ An AAAA battery can't Replace 2 AA batteriesIt's a bit foolish to think that AAAA batteries are equivalent to two AA batteries in any way. The inverse is true.AAAA batteries have the same voltage as AA batteries but only about half the energy. When you connect two AA batteries in series, you obtain 3V, which a single AAAA battery can not provide. They will not be able to share the same placeThe battery size is not proportional to the letter identification. An AA battery is, in reality, significantly larger than an AAAA battery. Even if you had a couple of 1/2 AA batteries (fractional sizes exist for commercial and rechargeable batteries, but not for Wal-Mart batteries), you couldn't use them in place of an AA battery. To fit in an AA socket, two 1/2AA cells would have to be stacked end-to-end in series. That would add the voltages together, giving you a 3V battery instead of the predicted 1.5V battery.IEC and ANSI standards specify battery sizes, however many began as proprietary sizes and were given a letter designation when approved as a standard. The AAA, for example, was introduced in 1917 but did not become a standard until the 1960s. Most common batteries are also known by other names; for example, before 1980, the AAA was known as the U16 cell in the United Kingdom.Ⅵ FAQ1. What is the AAAA Battery Equivalent?Batteries of the same size and capacity as AAAA are referred to in a few different ways depending on the manufacturer. E96, LR8D425, MN2500, and MX2500 are direct replacements for AAAA. The only difference between these batteries and AAAA batteries is their nomenclature.Several batteries are the same size and dimensions as the AAAA battery, but they are not perfect counterparts or direct replacements because they are made of different chemistries that offer varied performances for different applications.Examples include lithium and other rechargeable types. Although these batteries have the same size as an AAAA battery, the differing chemistry allows for variable drain performance, allowing the battery to run for extended periods in low-use applications such as a wall panel. These batteries may not work in all applications that require an AAAA battery.Always reference the owner's handbook of your device to discover the exact battery that is needed for the best results.2. Where to Buy AAAA Batteries?AAAA batteries are very common and well-liked. This implies that a large range of manufacturers produces these batteries, and a wide range of shops sell them. It is critical to remember that not all AAAA batteries are made equal, nor do all sellers have the same commitment to quality. To avoid low-quality or worse, counterfeit batteries, only get your batteries from a highly reputable merchant who sells only the highest-quality brands.3. What is the AAAA Battery Used for?AAAA batteries are mostly used in small specialty devices such as glucose meters, laser pointers, compact headphone amplifiers, computer styluses, and a variety of other small-factor gadgets. 4. What are the Differences Between AAAA and AAA Batteries?Despite having a comparable physical architecture, an AAAA battery is approximately 40% less in weight and thickness than a AAA cell.In addition, quadruple-A batteries are utilized in tiny specialized gadgets such as styluses and glucometers, as opposed to AAA batteries, which are used in common devices such as remote controls and toys.It is important to note that, despite their similarities, these two battery types are not interchangeable. 5. Are A23 and AAAA Batteries the Same?These are two distinct types of batteries. See the table below for the key distinctions:Battery TypeOther NamesVoltageDimensionsCommon UsesAAAALR61R8D4251.5 V–3.7 VLength—42.5mmDiameter— 8.33mmPowered computer styluses, glucometers, laser pointers, LED penlightsA23LRV08GP23A23AEMN211.25V1.5VLength—28.5mmDiameter— 10.33mmBluetooth headsets, garage door openers, keyless car entry systems, home security systems6. Are E96 batteries AAAA?Energizer E96 Batteries are constructed with Energizer Power Seal Technology to provide longer-lasting performance than ordinary alkaline batteries. These AAAA batteries are a substitute for the LR8D425, MN2500, and MX2500.7. Can I Use AAA Battery Instead of AAAA?AAAA is the next size down from AAA. They cannot be used interchangeably.8. Where Can I Buy AAAA Batteries?They are available in convenience stores and supermarkets, although due to their specialized nature, availability is not always guaranteed. You may also buy them online from places like Battery Specialists.9. How Much does the AAAA Battery Cost?An alkaline twin pack costs $7.95 to $9.85, while single rechargeable 300mAh NiMH batteries start at $6.45. Prices may differ from one location to the next.10. How Long can AAAA Batteries Last When Unused? Most alkaline batteries should be able to survive between 5 and 10 years in their original packaging and still function properly.However, it is best to keep them in a cool, dry place away from excessive moisture, heat, or potentially dangerous corrosive substances.11. Are the 18650 and AAAABatteries the Same thing?No, there are two kinds. 18650 is similar to an elongated AA. AAAA is an elongated AAA with the number 041660 that has the same transactions.An AAAA battery has a maximum voltage of 1.5 volts, whereas a 18650 battery has a nominal voltage of 3.7 volts (mid-range) and can reach 4.2 volts. An AAAA battery measures 8.3 x 42.5mm, while 18650 measures 18 x 65mm. The AAAA battery is not usually rechargeable, but the 18650 is designed to be charged/discharged continuously at its nominal voltage. The AAAA battery has a capacity of 635 mah, while the 18650 battery has a capacity ranging from 1000 to 3500 mah. The AAAA battery is intended for laser pointers or other devices with low current demand. The 18650 is intended for usage in circumstances requiring a large draw. The AAAA is an alkaline battery, whereas the 18650 is a lithium battery.12. What are the Best Rechargeable AAAA Batteries?Is your "best" a consideration of worth, or is it a "who cares about money?"My practice emphasizes obtaining the best value while balancing price and capability. I try to buy generic house-brand batteries instead of expensive OEMs like Duracell or Energizer.13. How to Install the AAAA Battery in Your Device?Determine the positive and negative ends of the battery first. The flat side (sometimes with markings) of a common Alkaline AAAA battery is normally the positive side. A little round protrusion should be evident on the opposite side. Typically, the side is the negative end. You can easily align the positive and negative ends of the battery with the relevant markings on your device now that you've determined the positive and negative ends of the battery. Please keep in mind that certain gadgets feature small metallic tabs to help with battery retention and function. These tabs must remain unharmed and undamaged, as doing so may jeopardize the performance of your device.If you happen to move this tab slightly out of place, you can generally fix it by gently readjusting it back into the proper alignment.14. What is the Smallest Battery?The nano battery, at 150 nanometers across, is hundreds of times thinner than a human hair and more than 60,000 times smaller than a AAA battery. How many "A"s are there? Rice University invented the little battery, which is a hybrid of a battery and a supercapacitor.         

CatalogIntroductionⅠ CR123A Battery Basics    1.1 What is a CR123A Battery?    1.2 Maximum Capacity of the CR123A Battery    1.3 The Manner of Applications of the BatteriesⅡ CR123A Battery Specifications    2.1 Technical Specifications of the CR123A Battery    2.2 Non-Rechargeable CR123A Battery Specifications    2.3 Rechargeable CR123A Battery SpecificationsⅢ Top 4 Considerations to Choose the CR123A Lithium BatteryⅣ Choosing the Best CR123A BatteriesⅤ Shopping for CR123A BatteriesⅥ Why Use CR123A Batteries for Arlo Cameras    6.1 Higher Voltage    6.2 No Voltage Drops    6.3 Lighter Weight    6.4 Longer Battery LifeⅦ FAQ    1. Why is it Called a CR123A?    2. Are there Rechargeable CR123A Batteries?    3. Can I Use 2 x CR123A Batteries Instead of an 18650 Battery?    4. Why do I See Names like EL123A, 123A, and K123LA?    5. Are all CR123A Batteries the Same?    6. How Long does a CR123A Battery Last?    7. What Battery is Equivalent to the CR123A Battery?    8. Are CR2 Batteries the Same As CR123A?    9. Where to Buy CR123A Batteries?    10. Are CR123A and CR123 Batteries the Same?    11. Can you Recharge a CR123A Battery?IntroductionCR123A Batteries, also known as 123 batteries, are high-capacity lithium-ion batteries that are widely used in security alarm systems. They are the preferred choice of PIR sensor manufacturers in wireless alarm systems due to their high capacity and long life. A CR123A battery can last up to three years in this application before needing to be replaced.This article will teach you everything you need to know about the CR123A battery.Top 5 batteries that will blow your mind!By this video, you will know which CR123A Battery is best for you. Ⅰ CR123A Battery Basics1.1 What is a CR123A Battery?The CR123A battery is a cylindrical cell lithium battery. The shape is reminiscent of a smaller version of a C Cell Battery, or, to put it another way, it resembles a can. These batteries are widely used in a variety of applications, ranging from medical devices to military-grade technology. Because this battery has so many applications, it is very popular and, as a result, can be difficult to find in stock. Furthermore, the lithium nature of the CR123A battery allows for a shelf-life of up to ten years before use, making storage simple. The CR123 battery, also known as CR17345 and DL123A, is used in professional photography equipment. It measures 34mm in height and 17mm in diameter, has a nominal capacity of 1500mAh and can be used to replace the SF123 and Innotek BAT-003 batteries. CR123A battery1.2 Maximum Capacity of the CR123A BatteryCR123A cells have a higher battery capacity, which is typically rated at 1500 mAh. In general, a higher capacity RCR123A cell will have a lower maximum drain rating than a lower capacity RCR123A cell.1.3 The Manner of Applications of the BatteriesThe most noticeable difference between the two types of CR123 batteries is how they both work. A CR123A power cell is a type of battery that is only intended to be discharged, and it must be properly disposed of once it is drained and empty.RCR123A cells, on the other hand, are rechargeable batteries that can be discharged and recharged multiple times. As a result, they are an excellent choice for small electronic devices that are frequently used. Because of this distinction, each type is suitable for a variety of applications.Ⅱ CR123A Battery Specifications2.1 Technical Specifications of the CR123A BatteryCR123A Battery Nominal Voltage:3.2-3.3 VoltsCR123A Capacity (Lithium)≈  1550 mAhCR123A Operating Temperature:-20°C – 75°CCR123A Height:34.2 mmCR123A Width (Diameter):17.0  mmCR123A Chemistry:Lithium Manganese Dioxide2.2 Non-Rechargeable CR123A Battery SpecificationsA non-rechargeable CR123A cell typically has a capacity of 1500 mAh and a nominal voltage of 3 volts. It has a life expectancy of seven to ten years, making it an excellent choice for home security devices and standby electronics that can be used in emergencies.A non-rechargeable CR123A cell is also designed to withstand high current drains, making it an excellent choice for devices that require a large amount of power in a short period.2.3 Rechargeable CR123A (RCR123A) Battery SpecificationsAn RCR123A or rechargeable CR123A battery typically has a capacity of 500 to 800 mAh and a voltage of 3.6 or 3.7 volts. However, as a cell designed to be recharged and used multiple times, RCR123A is a desirable power cell that is recommended for frequently used devices.Ⅲ Top 4 Considerations to Choose the Cr123A Lithium BatteryCR123A batteries are fully charged and ready to use when they arrive in the package. They will typically keep a full or near-full charge for at least ten years. They will also keep a fully charged state for roughly the same amount of time even when stored inside the flashlight.Because CR123A batteries have more capacity than rechargeable batteries, they will have longer run times. Because the voltage remains more constant as the capacity of the battery is depleted by use, the light will typically continue to operate at a reduced output even as the capacity of the battery becomes quite drained.When rechargeable 16340/18650 batteries are stored for up to a year, they gradually lose some of their charges, often up to 30%. Their capacity degrades quickly during use, but they keep the voltage at or above their nominally rated level very well. Rather than gradually dimming, your light will continue to provide full output until the batteries are depleted, at which point it will abruptly stop.A standard CR123A battery may be better for you if your tactical light needs a battery that is ready for immediate use, with full capacity even if it may sit relatively unused for periods.Ⅳ Choosing the Best CR123A BatteriesCR123A batteries are widely used in modern digital cameras, security systems, and even high-output flashlights. Even though there are a plethora of CR123A battery options available, the quality and battery life are far from standard.Best CR123A Battery | Batteries (Top 7 best in 2021)Ⅴ Shopping for CR123A BatteriesBattery life and shelf life are both important considerations when shopping for CR123A batteries because they determine how long your batteries will last while being used in electronic devices or sitting in storage. Another important consideration is compatibility, as not all rechargeable CR123A batteries will work in devices that accept standard CR123As. It is best to check your device's owner's manual before purchasing to ensure that a rechargeable option will work for your device. Finally, consider your electronic device's power consumption. If it consumes a lot of power, consider using high-quality batteries with longer battery life or a rechargeable option to save money in the long run.Ⅵ Why Use the CR123A Battery for Arlo Cameras6.1 Higher VoltageThe CR123A battery has a higher voltage than other batteries, so they can provide enough energy to your Alco Security Camera. The voltage of CR123A batteries is 3.0 volts (nominal). The most common voltage for a CRA123A battery is 3.7 volts.6.2 No Voltage DropsThe constant voltage curve of a Lithium CR123A battery allows for high power. Voltage drops can cause erratic performance, putting a security system's performance in jeopardy, especially if it's connected to a wireless network.6.3 Lighter WeightThe CR123A is lighter than most batteries. Most CR123A batteries are significantly lighter than AA batteries.6.4 Longer Battery LifeThe CRA123A has a battery life of 3 – 5 years on average, which is why it is known as a camera battery. When compared to other types of batteries, these batteries are more durable and last longer.Ⅶ FAQ1. Why is it Called a CR123A?The name of a CR123A cell, like that of many other batteries, contains a wealth of information about its chemistry and size. The CR denotes the battery's chemistry, a prefix used by the IEC to indicate the use of lithium chemistry, specifically LiMnO2. The 23A refers to the battery size, which in this case means that the CR123A is two-thirds the length of a standard A-size battery.2. Are there Rechargeable CR123A Batteries?Yes, but they're also known as RCR123A or 16340 batteries. They are 16mm shorter than CR123As, use lithium-ion chemistries, and typically have lower energy capacities. The RCR123A battery typically has a voltage of 3.6–3.7 volts, and not all flashlights and cameras can use both CR123As and their rechargeable counterparts.3. Can I Use 2 x CR123A Batteries Instead of an 18650 Battery?Occasionally, but not always. Some 18650 battery-powered flashlights and devices have long, spring-loaded interiors to account for varying battery lengths, allowing for the use of two CR123A batteries. Because 18650s are slightly thicker than CR123As, a battery sleeve may be required for a secure connection. We always indicate whether our flashlights are compatible with multiple battery sizes so you don't buy the wrong size cell, and you can shop for CR123A flashlights here.4. Why do I See Names Like EL123A, 123A, and K123LA?These are just variations on CR123As, which can also be referred to as 123, 123A, CR23, and other abbreviations. Some battery manufacturers brand their products, such as Duracell's DL123A and Energizer's EL123A.5. Are all CR123A Batteries the Same?No. The size, terminals, and nominal voltage of the CR123A battery are the same as for any other size. Any CR123A battery should fit in any device that requires one, but this is not always the case, as I discovered when I tried to use some cheap ones in my light meter. However, just like an AA battery, there are cheap ones that may only last an hour or two in a device, whereas a good name brand one may last 5 times as long. Most of the time, you get what you pay for. That Duracell battery will outlast an Amazon Basics or Dollar Store brand battery. And, because a CR123A is a 3-volt battery, some are a single lithium cell, while others are two alkaline cells connected in series. Both are functional, but lithium is more powerful.6. How Long does a CR123A Battery Last?The lifespan of a CR123A battery is heavily dependent on the battery's manufacturing quality and application. Assuming the battery is new and purchased from a reputable source, there is still a wide range of service life available depending on usage. A CR123A battery may last less than a month for a frequent application that requires a large amount of energy, such as a soldier's weapon light. With the right conditions, the service life of a more passive application, such as a home security alarm panel, can be over a year. Essentially, how long your CR123A battery will last is determined by what you require it to do.7. What Battery is Equivalent to the CR123A Battery?Although there are no direct replacements for the CR123A battery, there are batteries that are similar in size but have different chemistries and capabilities. The 16340 battery, for example, is the same size and shape as the CR123A, but it is made of lithium-ion rather than lithium manganese dioxide. This means the 16340 is rechargeable and can be used in the same places as a CR123A. Even though the 16430 battery will fit, it may not perform as well as a CR123A battery or have the same life span.8. Are CR2 Batteries the Same As CR123A?The CR2 battery is not interchangeable with the CR123A battery. Because the CR2 battery is slightly shorter than the CR123A battery, it will not fit in the majority of applications that require a CR123A battery. These batteries do have some similarities, such as the fact that they are both made of lithium manganese dioxide and are both 3 volt batteries. 9. Where to buy CR123A Batteries?CR123A batteries are very common and well-liked. This means that a wide range of manufacturers produces these batteries, and a wide range of retailers sell them. It's important to remember that not all CR123A batteries are created equal, and not all retailers are equally committed to quality. To avoid low-quality or, worse, counterfeit batteries, only purchase your batteries from a highly reputable retailer who sells only the highest-quality brands.10. Are CR123A and CR123 Batteries the Same?Yes. The CR123A and CR123 batteries are interchangeable. These batteries are also known as 123, 123A, DL123, DL123A, and SF123.The letter C in CR123A and CR123 denotes a lithium battery. The letter R stands for round, and the number 123 represents one-third. So 123 batteries are one-third the size of cell batteries. Some manufacturers add the letter A to indicate that the cell is an A cell.11. Can you Recharge a CR123A Battery?The CR123A is a non-rechargeable 3v lithium cell with a 17mm diameter and 34.5mm length. Because it is not rechargeable by definition, the answer is no.However, rechargeable batteries of the same size and voltage as a CR123A are available. A 16340 Li-ion cell, for example, is 16mm diameter and 34.0mm long, with a fully charged voltage of 3.7v, so this would be a compatible battery for some devices - you'd need to check with the device manufacturer.     

Introduction 18650 is a lithium-ion battery, where 18 means a diameter of 18mm, 65 means a length of 65mm, and 0 means a cylindrical battery, that is, they get their name from their size. As for scale, it is larger than an AA battery. 18650 battery is a rechargeable battery, has voltage of 3.7V and has capacity between 1800mAh and 3500mAh. You may also know 26650 battery and 21700 battery, what are they? and what is the difference between them? Intro To 18650 Li-ion Cells Catalog Introduction Ⅰ 18650 Battery Basic 1.1 Characteristic 1.2 Protective Function 1.3 Basic Parameters 1.4 Merits and Drawbacks Ⅱ 26650 Battery 2.1 Intro Info 2.2 Basic Parameters 2.3 18650 Battery vs 26650 Battery Ⅲ 21700 Battery 3.1 Info about 21700 3.2 Basic Parameters 3.3 21700 Battery Advantages 3.4 18650 Battery vs 21700 Battery Ⅳ Technical Specifications Comparison Ⅴ FAQ Ⅰ 18650 Battery Basic 1.1 Characteristic ① Large capacity: The capacity of a lithium battery is at least 1200mah or more, or even 3600mah, while the average battery cell is only about 500mah.② High energy storage efficiency and good stability: It can still maintain full performance output under 70°, and there is generally a protection circuit inside to prevent the battery from burning out.③ No memory effect: It is not necessary to discharge all the remaining power before charging, and it can be charged and discharged at any time, which is convenient to use.④ High charge and discharge cycle life: The number of cycles of lithium batteries is tens of thousands and the high temperature resistance is very good.⑤ Environmental protection, no toxic substances: Non-toxic, harmless, non-polluting, certified by RoHS quality. Figure 1. 18650 Battery 2200mAh 3.7V 1.2 Protective Function ① Overcharge protection: When the lithium battery is overcharged, the internal temperature rise of the battery will continue to rise, and a detection system for the battery voltage is added. When the battery overcharge voltage reaches a certain value or time period, the overcharge function will work and stop automatically to protect the battery.② Over-discharge protection: It means that the battery is always in an overloaded output state. Generally, there is discharge protection. At this time, the battery will be in a standby mode.③ Overcurrent protection: The overcurrent protection value can be adjusted, some are a few amperes, and the setting is selected according to the actual situation.④ Short-circuit protection: When the battery is short-circuited, the overcurrent protects the battery from burning.In addition to these four protection functions, some also have functions such as temperature and balance. Generally, the battery has a built-in PCM protection system with multiple protection functions. 1.3 Basic Parameters Number Item Parameter 1 Standard Voltage 7.4V 2 Rated Capacity 2200mAh 3 Continuous Working Current 1-3A 4 Overcurrent Protection Value 2-5A(adjustable) 5 Affordable Equipment Power ≤22V 6 Overcharge Protection Voltage 4.25±0.025V/Cell 7 Discharge Protection Voltage 2.50±0.05V/Cell 8 Charging Mode Constant-current and Constant-voltage 9 Maximum Charging Voltage 8.45V-8.55V 10 Recharging Current 0.2℃-0.5℃ 11 Charging Temperature 0~45℃, 45~85%RH 12 Discharge Temperature -20~55℃, 46~85%RH 13 Storage Temperature and Humidity Range Short term: more than one month -20℃~+55℃, 45~85%RH Medium term: more than three months -20℃~+45℃, 45~85%RH Long term: within one year -5℃~+20℃, 45~85%RH 14 Dimensions Brightness Reference Sample Length Reference Sample Thickness Reference Sample 15 Weight <120g   1.4 Merits and Drawbacks ✅Merits1) Large capacityThe capacity of 18650 battery is generally between 1200mah ~3600mah, and the general battery capacity is only about 800mah. If combined into a 18650 battery pack, it can easily break through 5000mah.2) Long LifeThe 18650 battery has a long service life, and the cycle life can reach more than 500 times during normal use, which is more than twice that of ordinary batteries.3) High Safety PerformanceThe 18650 battery has high safety performance. In order to prevent the short circuit of the battery, the positive and negative electrodes of the 18650 batteries are separated. Therefore, the possibility of short-circuiting has been reduced to the extreme. A protection board can be added to avoid overcharging and overdischarging of the battery, which can also prolong the service life of the battery.4) High VoltageThe voltage of 18650 lithium battery is generally 3.6V, 3.8V and 4.2V, which is much higher than the 1.2V voltage of nickel-cadmium and nickel-metal hydride batteries.5) No Memory EffectIt is not necessary to empty the remaining power before charging, which is convenient to use.6) Small Internal ResistanceThe internal resistance of the polymer battery is smaller than that of the general liquid battery, and the internal resistance of the domestic polymer battery can even be below 35mΩ, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone. This polymer lithium battery that supports large discharge current is an ideal choice for remote control models, and has become the most promising product to replace nickel-metal hydride batteries.7) It can be combined in series or in parallel to form a 18650 lithium battery pack.8) Wide Range of Use18650 batteries can be employed in Notebook computers, walkie-talkies, portable DVDs, instrumentation, audio equipment, model aircraft, toys, video cameras, digital cameras and other electronic equipment.❎Drawbacks1) The biggest disadvantage of the 18650 battery is that its size has been fixed, and it is not very well positioned when it is installed in some notebooks or some products. Of course, this can also be said to be an advantage, which is compared to other polymer lithium batteries, etc. This is a disadvantage in terms of the customizable and changeable size of lithium batteries. Compared with some products with specified battery specifications, it has become an advantage.2) The production of 18650 batteries requires a protection circuit to prevent the battery from being overcharged and causing discharge. Of course, this is necessary for lithium batteries, which is also a common drawback of lithium batteries, because the materials used in lithium batteries are basically lithium cobalt oxide materials, and lithium batteries made of lithium cobalt oxide materials cannot be discharged at large currents, and their safety is poor.3) The production conditions of 18650 batteries are high, compared with general battery production, they have high requirements for production conditions, which undoubtedly increases the production cost.   Ⅱ 26650 Battery 2.1 Intro Info The 26650 battery is a cylindrical lithium battery with a diameter of 26mm and a length of 65mm. It is used in power tools, lighting, wind and solar energy storage, electric vehicles, toys, instrumentation, ups backup power supply, communication equipment, medical equipment and military lights. Figure 2. 26650 Battery Size 2.2 Basic Parameters Cycle performance: 2000 times (1C charge/1C discharge, capacity retention rate ≥80%, 100% DOD)Maximum continuous discharge current: 9.6APulse discharge current: 15A, 5sOperating temperature: Charge: 0°C ~ 55°C, discharge: -20°C ~ 60°CStorage temperature: -20°C ~ 45°CBattery weight: 86g (approx.)Nickel-cobalt-manganese ternary lithium-ion 26650 single-cell nominal voltage is generally: 3.6VNominal capacity: 4500mAh (capacity range 4500-4650mAh)AC internal resistance: ≤30mΩ (plus PTC type)Charging conditions: Cut-off voltage 4.2±0.05V, cut-off current 0.01C. (Note: Charge with 0.5C constant current to 4.2V, and charge with constant voltage until the current drops to 0.01C and cut off)Discharge cut-off voltage: 2.75VCycle performance: 500 times (1C charge/1C discharge, capacity retention rate ≥70%, 100% DOD)Maximum continuous discharge current: 13APulse discharge current: 15A, 5sOperating temperature: Charge: 0°C ~ 55°C, discharge: -20°C ~ 60°CStorage temperature: -20°C ~ 45°CBattery weight: 92g (approx.) 2.3 18650 Battery vs 26650 Battery 1) Different Rated CapacityThe rated capacity of IFR26650 is 3000mAh, and the rated capacity of IFR18650 is 1100~1400mAh.2) Different DiametersThe diameter of the IFR26650 is 26mm, and the diameter of the IFR18650 is 18mm. 3) Different Reference QualityThe production test quality of IFR26650 is 94 grams, and the IFR18650 is 45 grams.18650 lithium batteries are used in lighting, industrial supporting lithium battery packs, power tool batteries, electric bicycle batteries, power lithium battery packs, etc., while 26650 batteries are used in integrated solar street light lithium battery packs, energy storage stations, solar energy storage batteries and so on.The 26650 battery will gradually replace the 18650 battery in the application of power batteries. And with the large-scale use of lithium batteries, it will inevitably be a trend that larger-capacity 26650 batteries replace the trendy 18650 lithium batteries in the 3C era.   Ⅲ 21700 Battery 3.1 Info about 21700 The 21700 battery is a cylindrical battery with a diameter of 21mm and a height of 70.0mm. Its charge density is currently the highest energy density and lowest cost battery in the world, and it is cost-effective. Figure 3. 21700 Battery 4000mAh 3.7V   3.2 Basic Parameters The positive electrode is converted to nickel, the performance is not affected, the consistency is good, and it can be directly used as a battery pack.*Rechargeable Li-ion Cell*Size: Diameter 21mm, Length 70mm*Weight: about 65g*Rated voltage: 3.6V*Standard capacity: 4800mAh*Internal resistance: about 13 milliohms*Charging voltage: 4.2V*Discharge cut-off voltage: 2.5V*Discharge current: 10A (15-20A can be discharged instantaneously).*Applications: flashlights, scooters, LED lights, miner's lamps, lighting products, power banks, mobile power supplies, backup power supplies, computers, mobile devices, cars, bicycles, communications, medical, energy storage, solar energy, etc. 3.3 21700 Battery Advantages 1) The energy density of the 21700 type battery is higher than that of the well-known 18650 type battery. The number of single cells in use can be greatly reduced, and the cost will be reduced after grouping. The capacity of a 18650 battery is about 2600-3600 mAh, while a 21700 battery supports more than 4000 mAh, even 5000mAh has appeared on the market. And the larger capacity is increasingly beneficial to extend the battery life of modern devices.2) The single volume of the rechargeable battery is increased by 35%. Taking the Tesla 21700 rechargeable battery as an example, the energy of a single battery can be increased by 34.8ah, an increase of 35%.3) The net weight of the system software is estimated to be reduced by 10%. The total capacity is more than 21,700. With the increase of single volume and the increase of single energy ratio, the total number of batteries required under the same kinetic energy can be reduced by about 1/3, and the total number of metal components and electrical components selected for the battery pack can reduce the difficulty of managing information systems coefficient. After converting SDI (Samsung Digital Interface) to the new 21700 rechargeable battery, it was found that the system software reduced the net weight by 10% over the existing battery. 3.4 18650 Battery vs 21700 Battery The 18650 rechargeable battery has high reliability and stability, and the performance index of the 21700 battery is much higher than that of the 18650 battery. In addition, compared with other battery models, the raw materials, processing technology and technical steps of the 21700 rechargeable battery are more advanced than the 18650 rechargeable battery level. Therefore, the 18650 and 21700 production lines are the best match.   Ⅳ Technical Specifications Comparison 18650 Battery 26650 Battery 21700 Battery Nominal Voltage: 3.6V Voltage: 3.2V Voltage: 3.7V Nominal Capacity: 2,850 mAh Technologie: Lithium Iron Phosphate Capacity: 3500- 5600mAh Minimum Discharge Voltage: 3V Dimension: 26.2 (Ø) x 65.6 (H) mm Operating voltage: 2.5- 4.2V Maximum Discharge current: 1C Weight: 80g Cutoff voltage: 2 - 2.5V Charging Voltage: 4.2V (maximum) Standard capacity: 2300mAh - 0.5C (current value of 2300mA at 1C°) Weight: 55gms to 75gms Charging current: 0.5C Max. charge voltage: 3.65 ± 0.05 V Charge density (Energy per cell): 10.5- 13.7Wh Charging Time: 3 hours (approx) Inner resistance: ≤15mΩ Charge discharge cycle: 500 to 2000 Charging Method: CC and CV Max. discharge voltage: 2.0V Continuous discharge current: 20- 35 amps Cell Weight: 48g (approx) Cycle characteristic: 1500 (C/5) - 300 (10C) Optimum /Minimum charging time: 2.5 hrs to 3.5 hrs Cell Dimension: 18.4mm (dia) and 65mm (height) Working temperature: 0 ~ 55°C Discharge: -20°C ~ 60°C Charging voltage: 4.2V- 5V   Ⅴ FAQ 1. Are 18650 batteries banned?Consumers should not buy or use individual, loose 18650 lithium-ion battery cells without protection circuits due to possible fire risk, according to a warning just issued by the Consumer Product Safety Commission (CPSC). ... Samsung and Sony also warn consumers against using the cells. 2. What battery replaces the 18650?21700 battery18650 batteries are generally 3.6/3.7 volts and have capacity ratings from 2,300 to 3,600 mAh. 21700 – were designed to be a larger and higher capacity replacement for 18650 batteries. Like the 18650, the 21700 has a nominal voltage of 3.6/3.7V. The 21700 was designed to replace the 18650 in EV battery packs. 3. Are AA batteries the same as 18650?No, they are slightly larger and have completely different formula. The 18650 battery is a lithium-ion cell classified by its 18mm x 65mm size, which is slightly larger than a AA battery. They're often used in flashlights, laptops, and high-drain devices due to their superior capacity and discharge rates. 4. What makes 18650 batteries explode?The safety problem of 18650 lithium-ion battery is burning or even exploding. The root cause of these problems lies in the thermal runaway inside the battery. In addition, some external factors such as overcharge, fire source, extrusion, puncture, short circuit, etc. Will cause the battery to explode. 5. How many hours does a 18650 battery last?A standard lithium ion 18650 battery is rated to last between 300 to 500 cycles before noticing a large performance drop. That is a pretty wide range and we'll discuss some things you can do to extend your batteries life to 500 or even more cycles. 6. How can I charge my 18650 without a charger?You need a regulator to apply a minimal charge, and fortunately, small incandescent lamps in light bulbs and decorative lamps are the perfect regulators for this task. You must connect a cable to the lamp you are using and the other end of the cable will be connected to a hot battery, such as the car's battery. 7. Why are 18650 batteries so popular?The 18650 battery has a voltage of 3.6v and has between 2600mAh and 3500mAh (mili-amp-hours). These batteries are used in flashlights, laptops, electronics and even some electric cars because of their reliability, long run-times, and ability to be recharged hundreds of times over. 8. Are 21700 batteries better than 18650?The stronger heating and lower resistance of 21700 cells than the 18650 results in higher polarization in the 18650 and deviations between the voltage curves for the two formats at higher C rates. The 21700 has about 50% greater capacity and energy density than the 18650 for discharge rates up to about 3.75C. 9. Does Tesla use 21700 batteries?Tesla and Panasonic's 21700 cell was huge news when it was announced in 2017. Tesla doesn't currently use 18650 cells, though; it now uses the 21700 standard with cells measuring 21mm by 70mm. ... The new Tesla battery has gone up in size again, this time far more significantly to 4680 or 46mm x 80mm. 10. Does Tesla use 18650 batteries?Currently, Tesla mainly uses the Panasonic 18650 lithium-cobalt-acid battery, the entire battery contains thousands of independent cells, the battery costs about 135 $ / kWh, to provide 233 W / kg of energy. The future of Tesla plans to launch a new 20,700 lithium battery pack. 11. Are 18650 and 26650 batteries interchangeable?Based on their voltage and current outputs, yes, the 18650 and 26650 batteries are interchangeable. However, the two battery types are very different in size. The 26650 has a much greater diameter, so it will not fit in items designed for the slimmer 18650 battery. 12. What battery can I use instead of 26650?Well, 18650s rechargeable lithium-ion batteries can be used alone or with other batteries too including 26650 batteries in order to build battery packs and power banks or devices used for recharging a device. So, depending on the purpose, both 26650 and 18650 battery can be used together. 13. How long does it take to charge a 26650 battery?around 20 hoursIt may take around 20 hours to charge the 26650 battery fully. 14. Are 18650 batteries the same as AAA?AAA Batteries vs 18650 BatteriesAt first, AAA and 18650 batteries don't have much in common - AAA batteries are cylindrical batteries 10.5 mm (0.41 inch) in diameter and 44.5 mm (1.75 inches) in length, while 18650 batteries are cylindrical batteries 18.6 mm (0.73 inches) in diameter and 65.2 mm (2.56 inch) in length. 15. Can I use regular batteries instead of 18650?Technically yes, you can even buy an adapter that takes 3 AA's to replace an 18650, I use them in my tactical torch if the 18650 dies. However AA batteries are generally much lower capacity than an 18650 so they don't tend to last anywhere near as long. 16. Is 26650 battery same as C battery?They may appear the same and or the same size, but the C battery has a 1.5V nominal voltage while the 26650 lithium battery has a 3.6V or 3.7V nominal voltage. 17. What is the best 26650 battery for Vaping?The Hohm Grown 2 is our top pick for 26650s. It is an accurately rated 30A battery and its large capacity will have it running for much longer than your typical 18650 cell. The 26650 battery has been used for vaping for quite some time now. 18. How many 21700 batteries are in a Tesla?Currently, 4,416 (2170) cells are placed inside Tesla Model 3/Y Long-Range battery packs. In contrast, there will only be 960 cells required to fill the same space. 19.What does 18650 mean on a battery?lithium-ion batteryAn 18650 battery is a lithium-ion battery. The name derives from the battery's specific measurements: 18mm x 65mm. For scale, that's larger than an AA battery. The 18650 battery has a voltage of 3.6v and has between 2600mAh and 3500mAh (mili-amp-hours).

Introduction A Capacitor is a component that can store and release electricity, and it is also one of the most commonly used electronic components. Its distinguishing feature is the "Pass Alternating Current (AC), Stop Direct Current(DC)". In a DC circuit, a capacitor is equivalent to an open circuit. Based on this, we will have this question: What the differences betwen ac and dc capacitors? or Are ac and dc capacitors interchangeable? What's the difference between batteries and capacitors? or Why can't we use capacitors instead of batteries? As for capacitor calculations, what the time constant for discharging a capacitor? Here you will get the answers. Figure 1. Capacitor Symbol Catalog Introduction Ⅰ Why Can the Battery (DC) Charge the Capacitors? Ⅱ DC Capacitors vs AC Capacitors Ⅲ Battery or Capacitor? Ⅳ Calculate the Time Constant for the Discharge of the Capacitors? Ⅴ FAQ Ⅰ Why Can the Battery (DC) Charge the Capacitors? In circuit analysis, there are two types of circuit responses: zero-input response and zero-state response. The so-called zero input response means that the input signal is zero; the so-called zero-state response means that the states of all energy storage components and various power supplies in the circuit are zero.When analyzing the zero-state response, short-circuit the voltage source and open the current source. For the capacitor, at the moment of energization in the zero state response, it can be considered as a voltage source with zero voltage, so it is equivalent to a short circuit. Analyze the following figures: Figure one is the circuit structure: power supply E, internal resistance r, switch QF, capacitor C and resistance R. When the switch QF is turned on, let's take a look at the current Ic and voltage Uc flowing through the capacitor: Figure 2. Zero-input Response and Zero-state Response Curve We see that at the moment t=0, the current flowing through the capacitor is the largest. The capacitor at this time is equivalent to a voltage source with zero voltage, and the power source E must be charged to it through the internal resistance r. Therefore, we can understand that it is actually a short circuit, so the maximum charging current, that is, the charging current Icmax at t=0 is: . In the figure, we can see that after 5τ, the current has been zero and the voltage has been charged to almost E. After that, the current flowing through the capacitor will not change any more, and the capacitor at this time plays a role in isolating the direct current. As can be seen in the figure, the charging process of the capacitor is divided into two parts, one is the transient transition process, and the other is the steady state process.Next, analyze the transition process carefully. Let us first look at the opportunity RC of the resistance r and the capacitance C. Resistance is equal to voltage divided by current, and capacitance is equal to electricity divided by voltage, and electricity is equal to current divided by time, so there is: , here T is called the time constant, generally represented by τ.The current thus flowing through the capacitor is: The exponential function here, its exponent is equal to the ratio of time to the time constant, so it is a pure number. When the time is equal to 0, Ic=Icmax; when the time is equal to 5τ, the value of the exponential function is 6.738×10-3. After substituting the above formula, get the current at this time is: At this time, the expression of the capacitor voltage Uc is: Note: Theoretically, the voltage on the capacitor should be charged to ER/(R+r), but because in the steady state, the impedance of the capacitor is infinite, so its voltage can be charged to E.From here we can see that the so-called capacitor blocking DC actually refers to its steady-state characteristics. In the steady state, the equivalent impedance of the capacitor is infinite, and the DC current cannot pass through it, so the current is zero, and there is a very small leakage current at most. In the transient state, the capacitor can flow current, and in the initial stage since the current is similar to a voltage source due to the capacitance, its characteristic is almost a short circuit, so the initial value of the current is the maximum. If our power source is not a battery, but a square wave pulser, what is the voltage of the resistor R after the capacitor? Figure 3. Square Wave Pulser The Figure 3. is a case where the time constant is small, which reflects the impulse response of the capacitor; and the picture below is a case where the time constant is large, which reflects these two effects have a large number of applications. If our power supply is AC, what is the voltage on the resistor R after the capacitor?When discussing the response of the capacitor to the AC current range, we need to temporarily look back at the first picture. From the figure, we can see that when the current takes the maximum value, the voltage is the minimum value, however, when the current takes the minimum value, the voltage is the maximum value. Why is that?The capacitance is equal to the ratio of the electric quantity to the voltage, that is, C=Q/U=It/U, from which the current is obtained: I=CU/t. And the voltage Uc on the capacitor is actually constantly changing. It is a function of time, so the above formula can be written as: This formula is very important, it is the key to unlock the capacitor under the action of AC power.The AC voltage can be expressed as, put it into the expression of the capacitor current , and get: We can see that when the voltage is zero, the current has reached its maximum value. In other words, for an AC power supply, the current I flowing through the capacitor leads the voltage by 90 degrees. It reveals the expression form of capacitance under AC voltage.Capacitors are used to block direct current, but they only have this performance in steady state. When the DC power supply changes rapidly, that is, the power supply continuously changes from zero to the maximum value, and becomes zero again. In this cycle, we can see that the capacitor not only does not block the DC, but becomes a component with almost zero impedance.In fact, it can be known from the capacitive reactance () that when the frequency of the power supply increases, the capacitive reactance of the capacitor decreases linearly with the increase in frequency. When we charge the capacitor with a DC power supply enough, the charging voltage of the capacitor can reach the same level as the electromotive force of the power supply. Here the key is that the capacitor is an energy storage element. Figure 4. Various Capacitors Ⅱ DC Capacitors vs AC Capacitors 1) Whether DC capacitors and AC capacitors are polarized: AC capacitors are also called non-polarized capacitors. As can be seen from the literal meaning, it can be polarity-independent. So it can be used in AC and DC circuits. The DC current uses a polarized capacitor, which has a high capacity, and a relatively small withstand voltage. In addition, both of them will be lost over time.2) The mobility of DC capacitors and AC capacitors are different: the voltage at one end of the DC capacitor is always high, and the current will always be the same and flow in one direction. While the two lines from the AC capacitor power supply, their voltage level is changing, so that the current can flow from A to B, or from B to A, and make certain adjustments and changes over time.3) Direct current and alternating current are different in direction conversion: alternating current can be regarded as two groups of direct current in turn to exert an effect on the load, which can be understood as the vector sum of the two groups of direct current in different time periods. The alternating current can be understood as a group of direct current in one direction in a short enough time. Figure 5. Ceramic Capacitors Ⅲ Battery or Capacitor? Capacitors and batteries are both electrical components, and both are energy storage components. But battery and capacitor are two completely different concepts. The difference between them is:1) Chemical Energy vs Electrical EnergyThe battery stores chemical energy, and then converts it into electrical energy to output. Capacitors store electrical energy, which depends on the two plates to determine the capacity. The former is a chemical change, the latter is a physical change. The main physical feature of a capacitor is to store electric charge, which can be charged and discharged like a battery, but does not undergo a chemical reaction.2) CapacityBatteries store a lot of electrical energy, but capacitors store less.3) Charge and Discharge Figure 6. Charge and Discharge Curve The charging and discharging speed and the number of times are different. Generally, it only takes a few seconds or minutes to charge a capacitor, while a battery usually takes several hours. The number of charging and discharging of the capacitor is at least tens of hundreds to thousands of millions of times, and the battery is generally only a few hundred to a thousand times.4) FunctionsThe purpose of the two is different. Capacitors can be used for coupling, blocking, filtering, phase shifting, RC, LC resonance and as energy storage components for instantaneous large current discharge. The battery is only used as a power source. Replacing Bike Battery with Capacitor Ⅳ Calculate the Time Constant for the Discharge of the Capacitors? Let’s review the calculation formula for the charge and discharge time of the capacitor. Suppose there is a power supply that charges the capacitor C through the resistor R, V0 is the initial voltage value on the capacitor, Vu is the voltage value after the capacitor is fully charged, and Vt is the voltage value at any time t On the capacitor, then the following calculation formula can be obtained:Vt = V0 + (Vu – V0) * [1 – exp( -t/RC)]If the initial voltage on the capacitor is 0, the formula can be simplified to:Vt = Vu * [1 – exp( -t/RC)]...Charging formulaIt can be seen from the above formula that because the index value can only be infinitely close to 0, but it will never be equal to 0, it takes infinite time for the capacitor to be fully charged.🔺When t = RC, Vt = 0.63Vu🔺When t = 2RC, Vt = 0.86Vu🔺When t = 3RC, Vt = 0.95Vu🔺When t = 4RC, Vt = 0.98Vu🔺When t = 5RC, Vt = 0.99VuIt can be seen that after 3~5 RCs, the charging process is basically over. When the capacitor is fully charged, the power supply is short-circuited, and the capacitor C will be discharged through R. At any time t, the voltage on the capacitor is:Vt = Vu * exp( -t/RC)...Discharging formula   Ⅴ FAQ 1. Can you use a capacitor as a battery?A voltage applied across the conductors creates an electrical field in the capacitor, which stores energy. A capacitor operates like a battery in that, if a potential difference is applied across it that can cause a charge greater than its "present" charge, it will be charged up.   2. Why can't we use capacitors instead of batteries?Capacitors don't provide large amount of energy because they have less energy density than batteries. Capacitors are useful to provide short duration power requirements because they can be charged or discharged at a higher rate than the batteries.   3. What is the difference between a battery and supercapacitor?Differences Between Capacitor and BatteryBatteries excel at storing energy, while supercapacitors rate better for power. In practical terms, this means that supercapacitors are better at discharging their stored energy quickly, while batteries save more energy in the same amount of material.   4. Which is better battery or capacitor?A capacitor is able to discharge and charge faster than a battery because of this energy storage method also. ... However, in general batteries provide higher energy density for storage, while capacitors have more rapid charge and discharge capabilities (greater Power density).   5. What is discharging of capacitor?Discharging a capacitor means releasing the charge stored within the capacitor. ... Hence the capacitor current exponentially reaches zero from its initial value, and the capacitor voltage reaches exponentially to zero from its initial value during discharging.   6. Is it safe to discharge a capacitor with a screwdriver?It's often safe to discharge a capacitor using a common insulated screwdriver; however, it is usually a good idea to put together a capacitor discharge tool and use that for electronics with larger capacitors such as household appliances.   7. Can you discharge a capacitor with a multimeter?The multimeter isn't used directly to discharge the stored energy of a capacitor. Instead, people use it to measure the voltage and power of the capacitor to know whether it is fully released or not. You can use different tools such as a light bulb or a DIY discharge tool for the process.   8. Why do we need to discharge a capacitor?You must discharge the capacitors before working on power supply circuits so you won't get shocked. ... Using a screwdriver to discharge the capacitor is not recommended because you can generate a spark and damage the printed circuit board or circuitry of the power supply. You can even blow the power section.   9. What is discharging time of capacitor?RC Discharging Table. Note that as the decaying curve for a RC discharging circuit is exponential, for all practical purposes, after five time constants the voltage across the capacitor's plates is much less than 1% of its inital starting value, so the capacitor is considered to be fully discharged.   10. What is the time constant of a capacitor?The time constant of a series RC (resis-tor/capacitor) circuit is a time interval that equals the product of the resistance in ohms and the capacitance in farad and is symbolized by the greek letter tau (τ). The time in the formula is that required to charge to 63% of the voltage of the source.   11. Is the time constant the same for charging and discharging the capacitor?The time constant of a resistor-capacitor series combination is defined as the time it takes for the capacitor to deplete 36.8% (for a discharging circuit) of its charge or the time it takes to reach 63.2% (for a charging circuit) of its maximum charge capacity given that it has no initial charge.   12. What is the formula of discharging of capacitor?q=ϵC(1−eCR−t) where q is the charge on the capacitor at time t,CR is called the time constant, ϵ is the emf of the battery. Discharging: If the plates of a charged capacitor are connected through a conducting wire, the capacitor gets discharged.   13. What is energy stored in capacitor?Electrical potential energyEnergy stored in a capacitor is electrical potential energy, and it is thus related to the charge Q and voltage V on the capacitor. We must be careful when applying the equation for electrical potential energy ΔPE = qΔV to a capacitor. Remember that ΔPE is the potential energy of a charge q going through a voltage ΔV.   14. Where is energy stored in capacitor?A charged capacitor stores energy in the electrical field between its plates. As the capacitor is being charged, the electrical field builds up. When a charged capacitor is disconnected from a battery, its energy remains in the field in the space between its plates.   15. Which type of current is blocked by a capacitor?Alternating current doesn't really "flow", it just oscillates back and forth. A capacitor acts like an elastic membrane, it allows the oscillation but blocs the flow of DC current.

I OverviewValve regulated lead acid battery (VRLA battery) is generally divided into gel battery and AGM battery. Figure 1. Classification of VRLA BatteryGel battery is a valve regulated lead acid battery made by gel technology which not only refers to whether the battery contains gel electrolyte, but also includes the battery design ideas, structural characteristics, manufacturing technology and other technical measures to ensure the corresponding performance of the battery.Figure 2. Gel BatterySimilarly, for AGM battery, it also refers to valve regulated lead acid batteries manufactured by AGM technology. To hold the sulfuric acid in the battery with AGM separator is only one of the technical features of AGM battery.Figure 3. AGM BatteryBecause the two technologies are completely different, there is a great difference in performance between gel battery and AGM battery. In order to better understand the performance difference between gel battery and AGM battery, this article deeply discusses their differences in terms of battery design.Sealed Lead Acid Battery Recovery(The man in the vedio shows how to clean, open, refill, desulfate and test a totally dead sealed lead acid battery.)CatalogI OverviewII AGM vs. Gel Batteries: Electrolyte Fixation TechnologyIII AGM vs. Gel Batteries: ElectrolyteIV AGM vs. Gel Batteries: Polar Group4.1 AGM Battery has Excellent LargeCurrent Discharge Performance4.2 Make Full Use of Active Substances4.3 Conducive to the Transmission of Oxygen4.4 Prevent the Battery from Entering the Life Decline Period RrematurelyV AGM vs. Gel Batteries: Oxygen CycleVI AGM vs. Gel Batteries: CostVII ConclusionVIII AGM vs.Gel Batteries QuizII AGM vs. Gel Batteries: Electrolyte Fixation TechnologyBecause both gel battery and AGM battery adopt cathodic absorption maintenance-free technology based on internal oxygen cycle, there is no essential difference in maintenance-free technology, only in the way of fixing electrolyte.For the AGM battery, the AGM manufacturing technology is adopted, and the electrolyte in the battery, which is dilute sulfuric acid, can be held in the glass separator. The electrolyte is fixed by making use of the porosity of the glass separator, which has a strong adsorption, allowing the electrolyte to become immobilized. Its principle is similar to the principle of water absorbing sponge.Figure 4. Water Absorbing SpongeBecause dilute sulfuric acid is made of pure sulfuric acid and water, the density of pure sulfuric acid is 1.84g/cm3, and the density of pure water is 1.0g/cm3. In the backup battery, the storage battery is kept stationary for a long time. Due to the effect of gravity, the dilute sulfuric acid electrolyte will stratify, that is, the sulfuric acid density at the bottom is high, while the sulfuric acid density at the top is low. In high-type batteries, this delamination phenomenon is particularly evident. Therefore, in conventional batteries, the height of the battery generally does not exceed 400 mm.Figure 5. Delamination of ElectrolyteThe layering of the electrolyte will make the active material on the top of the electrode plate unable to release the capacity it should have because of insufficient acid, and it will be overcharged during charging. And the bottom will be difficult to charge because the sulfuric acid concentration is too high. At the same time, due to the delamination of the acid, concentration polarization back-EMF will also be generated in the upper and lower parts of the electrode plate, which ultimately reduces the operating voltage and capacity of the battery. Furthermore, excessively high sulfuric acid at the bottom will also accelerate the corrosion of the bottom grid and the sulfation of the plates, thereby shortening the battery life.For gel battery, it adopts gel manufacturing technology, and the electrolyte in the battery is fixed in the silicon gel. The fixation of the electrolyte is due to the silicone space network structure formed by the polymerization of gel gel particles to effectively fix the sulfuric acid electrolyte. The principle is similar to the use of jelly to fix the sulfuric acid electrolyte. In the space network, the silica gel is the skeleton supporting the entire network, and the sulfate ion can move freely at a certain level, which can ensure the smooth progress of the battery chemical reaction, that is, the smooth charge and discharge of the battery.Figure 6. Gel Battery ElectrolyteBecause the spatial network structure of silica gel is rich in a large number of silicon oxidation bonds, it can form hydrogen bonds with hydrogen in the sulfuric acid molecule. Due to this weak chemical action, the silica gel easily adsorbs and releases sulfuric acid molecules. Even if the electrolyte is not moved for a long time, due to the existence of this effect, it can basically offset the effect of gravity, so that the diluted sulfuric acid electrolyte is evenly distributed up and down, and it is not easy to cause delamination. Furthermore, the average pore size of the gel itself is about 100 times smaller than the average pore size of the AGM separator, and the comparative area of the gel itself is much larger than the specific surface area of the AGM separator. The small pores or micropores can be better keep sulfuric acid electrolyte. In the gel battery, since the electrolyte is not layered, the active materials on the upper and lower parts of the inner electrode plate of the battery can be fully utilized, so the battery has a long life span and can also be manufactured as a high-type battery.Figure 7. NO Delamination of ElectrolyteIII AGM vs. Gel Batteries: ElectrolyteThe AGM battery uses an AGM separator to fix the sulfuric acid electrolyte. In order to make the oxygen generated in the positive electrode in the later stage of charging easy to pass through the separator to the negative electrode and be absorbed by the negative electrode, a lean liquid design must be adopted to ensure the smooth progress of the internal oxygen cycle. The so-called lean electrolyte design takes the sponge's liquid absorption as an example. Under normal conditions, a sponge can be 100g of water. The actual design is only to allow the sponge to absorb 80~90g of water. This design is a lean electrolyte design. Therefore, the amount of sulfuric acid electrolyte in the AGM battery is relatively small. In lead-acid batteries, the sulfuric acid electrolyte is involved in the electrochemical reaction of the battery. In order to ensure the discharge performance of the battery (the amount of sulfuric acid needs to be sufficient), it can only be achieved by increasing the sulfuric acid concentration. Therefore, AGM batteries generally use higher density/concentration sulfuric acid.Due to the small amount of electrolyte in the AGM battery, the high concentration of sulfuric acid has a series of adverse effects on the battery itself. Since the amount of electrolyte in the AGM battery is relatively small and the heat capacity of the battery is also small, the AGM battery is sensitive to temperature. For batteries with the same capacity that can be fully charged, if the same amount of electricity is charged, the temperature rise of the AGM battery is significantly greater than that of the gel battery.For AGM batteries, due to the use of higher concentration of sulfuric acid, the grid corrosion is faster, and it is easier to produce inert lead sulfate, which makes the battery's charge acceptance worse, and the battery is more difficult to charge. That is, AGM batteries are more prone to early capacity decay. With the extension of battery life, the AGM battery continuously loses water due to overcharging, and the sulfuric acid concentration in the battery rises slowly, which is more serious. In batteries, the sulfuric acid saturation of the AGM separator is usually 95% to 85%. Compared with a fully saturated separator, when the saturation is 85%, the effective internal resistance of the battery increases by 90%. When the sulfuric acid saturation of the separator in the battery is less than 85%, the battery life will quickly end due to excessive tail current, lack of acid and excessive internal resistance. Therefore, for AGM batteries, the battery loses 10% of its water, and the life of the battery is reduced by more than 50%.Figure 8. Influence of AGM Battery Lean Liquid Design on Battery PerformanceThe development of the gel battery itself is based on the improvement of the flooded battery. Because the sulfuric acid electrolyte is fixed by silicon gel, the gas transmission inside the gel battery is completed through the channel formed by the cracks generated by the gel cracking. The amount of electrolyte does not affect the gas transmission channel. Therefore, there is no strict limit on the amount of electrolyte, and the liquid-rich design is usually adopted to ensure that the battery has better performance. Therefore, the amount of electrolyte in the gel battery is relatively large. For large-density batteries, the amount of rich liquid is about 20%, and for medium-density batteries, the amount of rich liquid is about 15%. Gel batteries generally use a lower concentration of acid than AGM batteries. At a lower acid density, the corrosion rate of the grid is lower, and the battery's charge acceptance is also significantly improved, thereby extending the battery's life span. Secondly, the gel battery has more electrolyte. The more electrolyte, the greater the heat capacity of the battery, so the gel battery is not very sensitive to temperature. The high temperature has relatively little effect on the performance and life span of the gel battery. In addition, due to the high voltage or maintenance operations such as equalizing or overcharging the battery during long-term use, the battery may lose water. The gel battery has more electrolyte and a small amount of water loss, which has little effect on the life of the battery. Therefore, the life span is longer and the battery stability is better.How a lead-acid battery works(The man in this vedio explains the essential principles of a lead-acid battery. )IV AGM vs. Gel Batteries: Polar Group In AGM batteries, the assembly compression ratio of the pole group has a very important impact on the battery performance and battery life.Appropriately increasing the pole group assembly pressure of the battery has the following benefits:4.1 AGM Battery has Excellent LargeCurrent Discharge PerformanceThe AGM battery adopts a tight assembly structure, so that the distance between the positive and negative plates is smaller, and the distance of ion conduction in the battery is shorter. Thereby reducing the internal resistance of the battery. Furthermore, with the tight assembly structure, the electrode plate and the separator maintain good contact, and the contact resistance between the separator and the electrode plate is also reduced. These make AGM batteries more conducive to large current discharge.4.2 Make Full Use of Active SubstancesBecause the AGM separator not only plays the role of isolating the positive and negative plates, but also plays the role of storing and maintaining the electrolyte. Adopting a tight assembly structure, the polar plate is close to the AGM separator, which allows the electrolyte to impregnate the entire polar plate, so that the active material is fully utilized, and the use capacity of the battery is increased.4.3 Conducive to the Transmission of OxygenWith a tight assembly structure, the polar plate is in close contact with the AGM separator, which is conducive to the smooth diffusion of oxygen through the separator to the negative electrode. Because the polar plate is under a large pressure, the AGM separator is compressed, and the micropores in the AGM separator perpendicular to the direction of the separator become larger, making oxygen easily penetrate the separator from the positive electrode to the negative electrode.On the other hand, because the AGM separator is compressed, the pores parallel to the direction of the separator plate become smaller, thereby suppressing the escape of oxygen generated in the positive electrode along the plane direction of the separator.4.4 Prevent the Battery from Entering the Life Decline Period RrematurelyTo prevent the battery from entering the life decline period prematurely, AGM separator has a strong liquid absorption performance and a high porosity. It is a separator made of hydrophilic glass fibers and does not contain a binder. The separator itself has poor strength. The material of the AGM separator is shown in Figure 9 below.Figure 9. Glass Fibers Put the AGM separator in boiling water for 1 hour, the AGM separator may disintegrate into pure glass fiber. If the AGM battery is loosely assembled, the escape of oxygen generated at the end of the battery charge may change the microstructure of the AGM separator, making the battery prone to early capacity decay. The tight assembly structure can effectively suppress the softening and shedding of the positive electrode active material, thereby greatly extending the life span of the AGM battery. Therefore, the AGM battery must adopt a tight assembly design. This structure not only makes the oxygen circulation in the battery more smoothly, but also ensures that the AGM battery has excellent large current discharge performance and better life span.In a gel battery, the viscosity of the gel electrolyte is much greater than that of dilute sulfuric acid, so if the assembly is too tight, it is not conducive to the gel electrolyte entering the pole group. Therefore, the assembly of the pole group is relatively loose. The separator used is usually a microporous plastic separator containing ribs to facilitate the gel electrolyte to enter the pole group and the inside of the separator. The separator of the gel battery mainly serves to isolate the positive and negative plates. The gel battery itself is developed on the basis of the rich liquid battery, and basically maintains the characteristics of the original rich liquid battery, and there is no strict requirement for the assembly pressure of the battery pole group. In the gel battery, due to the loose requirements for the assembly of the pole group, the distance between the positive and negative plates is relatively large, and the ion conduction distance in the battery is long, so the internal resistance of the gel battery is usually large, which is more suitable for medium current and small. When the current is discharged, the large current performance of the battery is relatively poor. V AGM vs. Gel Batteries: Oxygen Cycle In VRLA batteries, oxygen is transferred from the positive electrode to the negative electrode, where it is compounded. According to the principle of oxygen circulation, the recombination of oxygen at the negative electrode mainly occurs at this three-phase interface.There are two ways of oxygen transmission: one is vertical transmission, that is, the oxygen generated by the positive electrode first moves to the periphery of the pole group, and then reaches the negative electrode plate. The second is horizontal transmission, that is, the oxygen generated by the positive plate directly penetrates the separator to reach the negative electrode.In VRLA batteries, the gas channel that generates oxygen circulation not only occurs in the separator between the positive and negative plates, but also occurs in the outer space of the pole group. In AGM sealed batteries, the gas generated from the positive electrode needs to grow from small bubbles to larger bubbles at the end of charging or during the float charging process. As the bubbles continue to grow, they expand into the AGM separator, and the sulfuric acid electrolyte in the large pores in the separator is discharged to form a gas channel, and oxygen is transferred from the positive electrode to the negative electrode.Figure 10. VRLA BatteryTherefore, only when the oxygen pressure generated by the positive electrode reaches a certain level, a number of oxygen channels will be formed in the AGM separator. After the gas is transferred to the negative electrode, it is absorbed by the negative electrode, and the discharged sulfuric acid liquid will reoccupy the gas channel in the AGM separator until the bubbles generated on the surface of the positive electrode grow again to form a gas channel. Therefore, in the AGM battery, the gas passage from the positive electrode through the separator to the negative electrode may be unstable or discontinuous.In the AGM battery, due to the fact that after the sulfuric acid electrolyte is added to the separator, the assembly pressure is greatly reduced, and the surface of the electrode plate and the separator is uneven, so that there is always a relatively large gap between the electrode plate and the separator. The direct transmission of oxygen from the positive electrode to the negative electrode is difficult, so in AGM batteries, a considerable amount of oxygen is transferred vertically. Since the pore size of the polar plate is smaller than that of the AGM separator, more electrolyte is retained in the polar plate. The lead and negative electrodes on the side plates of the battery pole group are not covered with colloids, etc., and it is easy to form a three-phase interface of gas, liquid, and solid. In the AGM battery, the reaction between lead and anode and oxygen not only occurs on the surface between the positive and negative plates, but a considerable amount of oxygen circulation also occurs on the negative plates outside the pole group. The rapid recombination of oxygen on the side panel of the pole group also makes the total pressure of the gas chamber inside the battery lower than that of the gel battery. It is reported that stiffening strips on the inner wall of the battery tank can greatly increase the efficiency of oxygen circulation.Figure 11. AGM BatteryIn the study of the gel battery, it was found that in the gel battery, with the extension of the use time and the formation of micro-cracks in the colloid, the total gas chamber pressure in the gel battery is higher than the total gas chamber pressure of the AGM battery at equilibrium, vertical oxygen transmission in the direction is suppressed. In the gel battery, with the extension of use time, the silicone gel will dry crack, forming fine cracks, thereby forming a channel for oxygen to be transferred from the positive electrode to the negative electrode. In a gel battery in normal operation, since both the positive and negative plates are covered with gel, the oxygen compound reaction rate on the negative plate on the side of the pole group is extremely low. The compound reaction of oxygen on the negative electrode mainly occurs on the negative electrode plate corresponding to the positive electrode plate. That is, horizontal transmission is mainly used. Furthermore, in the gel battery, the electrolyte saturation has an important influence on the oxygen transmission mode. When the saturation is higher than 91.5%, the transmission mode is mainly vertical transmission; when the saturation is lower than 91.5%, mainly horizontal transmission. In the oxygen cycle of the gel battery, the transmission of oxygen in the vertical direction is slower than in the AGM battery; Compared with the AGM battery, the gel battery is more conducive to the horizontal transmission of oxygen. In the gel battery, since it is a gas channel formed by dry cracking of the gel, the gas transmission channel is basically stable. VI AGM vs. Gel Batteries: CostThe cost of gel batteries is higher than that of AGM batteries in terms of equipment, separators, and materials:First, the cost of equippment. In the production of gel batteries, not only the equipment for glue distribution but also the special equipment for glue filling is needed. Due to the use of gel electrolyte, the gelation phenomenon may occur due to the high viscosity of the gel electrolyte, so the production process control requirements are completely different from the production process of the AGM battery, the process is more complicated, and the technology is difficult to master.Second, the cost of separators. The gel battery uses a microporous plastic separator, which requires high porosity, good strength, and thin thickness. The cost of a high-quality microporous separator is relatively high. For AGM batteries, the separator is made of ultra-fine glass fiber, and the manufacturing process is relatively simple and the cost is low.Third, the cost of materials. The design margin of the electrolyte of the gel battery is generally larger. Not only does it increase the silicone gel material, it also requires more sulfuric acid electrolyte. The total weight of sulfuric acid electrolyte and silica gel is heavier and the material cost is higher.Therefore, the overall cost of the gel battery is high. As for AGM battery, the production process is relatively simple, the process is better controlled, and the battery is lighter, so the cost is lower than gel battery.Figure 12. AGM vs. Gel Batteries: CostVII ConclusionFrom the foregoing comparative analysis, it can be seen that AGM batteries and gel batteries are two types of batteries manufactured using different design ideas.For AGM batteries, AGM separators are used to fix the electrolyte, which is generally designed with a lean electrolyte and a tight assembly structure, which makes the battery lighter and has better large current discharge performance. Due to the low amount of acid, high-density sulfuric acid is required. The life span of AGM batteries is relatively short, and the manufacturing cost is relatively low.For the gel battery, it adopts a rich-liquid design, the amount of sulfuric acid electrolyte used is large, the density of sulfuric acid is relatively rare, the battery performance is more stable, the life span is longer, and the manufacturing cost is higher. VIII AGM vs.Gel Batteries QuizFigure 13. Quiz1. What is a gel battery?A gel battery (often referred to as a gel cell battery) is a lead-acid battery that is valve regulated. When the electrolyte is mixed with sulphuric acid and silica, it becomes a relatively stationary gel substance. 2. What is better AGM or gel battery?AGM batteries are comparably cheaper than Gel batteries, but they present a longer life span and offer bigger bursts of amps when needed. These batteries work best in high-power usage, such as sports vehicles. 3. What are the advantages of a gel battery?These types of batteries will operate effectively between an incredible -40 degrees Fahrenheit and 140 degrees Fahrenheit. Additionally, their gel make-up makes them better able to withstand corrosion, shock, and vibration. Slower discharging for a longer lifespan. 4. Is AGM a gel battery?AGM (Absorbed Glass Mat) and gel batteries are both examples of VRLA (Valve Regulated Lead-Acid) batteries. ... In common parlance, the term gel battery is used to indicate both AGM and Gel batteries. AGM batteries may also be called “membrane”, “starved electrolyte” or “dry” batteries. 5. Is an AGM battery worth the extra money?Definitely worth the price. The biggest perk is they hold their charge. You can charge it in the fall, come spring it's still 100% charged. I know mine has lasted quite a bit longer than my old lead batteries…that said, I never spent the money on lead then I now do on AGMS.

Ⅰ IntroductionLithium batteries are a type of battery that uses lithium metal or lithium alloy as the cathode material and use a non-aqueous electrolyte solution. Lithium battery is an ambiguous term. In 1912, lithium metal batteries were first proposed and studied by Gilbert N. Lewis. In the 1970s, M. S. Whittingham proposed and began researching lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal require very high environmental requirements. With the development of science and technology, lithium batteries (broadly speaking) have now become mainstream. CatalogⅠ IntroductionⅡ HistoryⅢ Li & Li-ion Battery Features3.1 Advantages3.2 DisadvantagesⅣ Lithium Battery VS Lithium Ion Battery4.1 Lithium Batteries4.2 Li-ion BatteryⅤ ApplicationⅥ Battery Security6.1 Battery Storage6.2 Charging Rules6.3 Battery ExplosionⅦ Development ProspectsⅧ One Question Related to lithium metal & lithium ion Battery and Going Further8.1 Question8.2 AnswerⅡ HistoryIn the 1970s, M.S. Whittingham used titanium sulfide as the positive electrode material and metallic lithium as the negative electrode material to make the first lithium battery.In 1980, J. Goodenough discovered that lithium cobaltate could be used as a cathode material for lithium-ion batteries.In 1982, R.R.Agarwal and J.R.Selman of the Illinois Institute of Technology discovered that lithium ions can be embedded into the graphite, which is fast and reversible. At that time, lithium batteries made of metal lithium have attracted much attention because of their safety issues. Therefore, people tried to embed lithium ions to graphite to make rechargeable batteries. Finally, first available lithium-ion graphite electrode was successfully trial-produced by Bell Labs.In 1983, M. Thackeray, J. Goodenough, and others found that manganese spinel is an excellent cathode material, which has good properties of low cost, stability, and excellent electrical and lithium conduction. Its decomposition temperature is high, and its oxidizing property is far lower than that of lithium cobaltate. Even if having a short circuit or overcharge, combustion and explosion can be avoided as far as possible.In 1989, A. Manthiram and J. Goodenough discovered that a positive electrode using a polymeric anion would generate a higher voltage.In 1991 Sony released the first commercial Li-ion battery. Subsequently, lithium-ion batteries revolutionized the development of consumer electronics. For example, the weight and volume of portable electronic devices such as mobile phones, notebooks, and calculators has greatly reduced.In 1996, Padhi and Goodenough discovered that phosphates with an olivine structure, such as lithium iron phosphate (LiFePO4), are more superior than traditional cathode materials, and  become the mainstream cathode materials gradually.Lithium batteries were first used in pacemakers. Lithium batteries have the advantages of low self-discharge rate and gentle discharge voltage, so that the pacemaker implanted in the human body can operate for a long time without recharging. Lithium batteries generally have a nominal voltage higher than 3.0V, making them more suitable as integrated circuit power supplies.To develop a new better lithium battery, various materials have been researched and tested. Ⅲ Li & Li-ion Battery Features3.1 Advantages1) High energy density. With high storage power density, it has reached 460-600Wh / kg, which is about 6-7 times that of lead-acid batteries. It is one of the major advantages of lithium ion battery technology. For example, high energy-dense 18650 cells can deliver over 3,000mAh and the costs have dropped further today.2) Long cycle life, the service life can reach more than 6 years. For example, the battery 1C (100% DOD) with lithium ferrous phosphate as the positive electrode is charged and discharged about 10,000 times.3) High rated voltage, a single battery working voltage is 3.7V or 3.2V, which is approximately equal to the series voltage of 3 Ni-Cad or Ni-MH rechargeable batteries, in addition, it is convenient to form a battery power pack. What’s more, lithium batteries can use a new type of voltage regulation technology to adjust the voltage to 3.0V to suit the use of small appliances.4) High power resistance capacity. For example, phosphate lithium-ion battery for electric vehicles can reach 15-30C charge and discharge capacity, which is convenient for high-intensity startup acceleration.5) Low self-discharge rate. It is one of the most outstanding performances of the battery, which can generally be less than 1% per month, and it is much lower than that of other rechargeable cells such as Ni-Cad and NiMH batteries.6) Light weight, about 1 / 6 to 1 / 5 of lead acid products under the same volume.7) Good performance at high and low temperature. For example, the battery can be used in the environment of -20 ℃ ~ 60 ℃, after processing, it can be used in the environment of -45 ℃.8) Less harm to environment. Regardless of production, use and scrap, it does not contain or produce any toxic and harmful heavy metal substances, such as lead, mercury, cadmium.9) There are several types available. It means that the right technology can be used for the special application required. 3.2 Disadvantages1) Lithium primary batteries have poor safety and risk of explosion.2) Li-ion batteries (lithium cobaltate) cannot be discharged at high currents.3) Li-ion batteries need protecting circuit to prevent the battery from being overcharged and over discharged.4) Li-ion batteries will only last two or three years from the date of manufacture whether you use them or not.5) High production requirements and costs.6) Limited use conditions, because they are extremely sensitive to temperature.7) As for air transportation/travel, many airlines limit the number of lithium ion batteries they take.Ⅳ Lithium Battery VS Lithium Ion Battery4.1 Lithium Batteries4.1.1 ChemistriesLithium batteries are primary batteries that have metallic lithium as an anode, and metallic lithium or other alloy metals used as cathode, regarded PP or PE film as the the separator.Note: Discharge reaction: Li+MnO2=LiMnO2They have low self-discharge rate, annual self-discharge can be ≤1%. The service life of fully sealed (metal welded, lazer seal) batteries up to 10 years, and semi-sealed batteries are generally 5 years.Lithium metal is used as the negative electrode, and the positive electrode and the electrolyte are thionyl chloride (sulfoxide). Cylindrical batteries have electricity after assembly. The voltage is 3.6V, which is one of the most stable types of batteries. It is suitable for use on electronic instruments and equipment that cannot be maintained frequently, providing subtle current. 4.1.2 Battery StructureLithium batteries usually come in two shapes: cylindrical and square. The inside of the battery is a spiral winding structure, and a very fine and highly permeable polyethylene film separator is used to separate the positive and negative electrodes. The positive electrode contains a current collector composed of lithium cobaltate (or nickel-cobalt lithium manganate, lithium manganate, lithium ferrous phosphate, etc.) and the aluminum foil. The negative electrode consists of a current collector composed of graphitized carbon material and the copper foil. The battery is filled with an organic electrolyte solution. It is also equipped with a safety valve and a PTC element (partially cylindrical) to protect the battery from damage during abnormal conditions and output short circuits. 4.1.3 Battery Material AnodeThere are many choices of anode materials, for example, LiFePO4 is mostly used as mainstream products.  Chemistry ReactionThe lithium ion is embedded when discharge, and de-embedded in the charge.On Charge：LiFePO4 → Li1-xFePO4 + xLi+ + xe-On Discharge：Li1-xFePO4 + xLi+ + xe- → LiFePO4 CathodeGraphite is commonly used, and new research has found that titanate may be a better material. Chemistry ReactionThe lithium ion is de-embedded when discharge, and embedded in the charge.On Charge：xLi+ + xe- + 6C → LixC6On Discharge：LixC6→ xLi+ + xe- + 6C Conductive CoatingThe conductive coating is also called pre-coating. In industry, it usually refers to a layer of conductive coating applied to the surface of the positive electrode current collector-aluminum foil. The earliest experiments on aluminum foil in batteries can be traced back to the 1970s. With the development of new energy industry, especially the development of LiFePO4 batteries, it has become a hot new technology in the industry.The conductive coating can effectively improve the adhesion of the pole pieces in the lithium battery, reduce the amount of binder used, and also significantly improve the battery's electrical performance:1) Contact resistance decreases 40%2) Adhesive reduces 50%3) Battery voltage increases 20%at the same magnification.Material and current collector adhesion increases 30%, and no delamination after long-term cycling.In addition, carbon coated aluminum foil is another coating which made of conductive carbon-based composite paste and high-purity electronic aluminum foil by transfer coating process. 4.1.4 Shell CharacteristicsTo improve safety and voltage, scientists have invented materials such as graphite and lithium cobaltate to store lithium atoms. The molecular structure of these materials forms nano-scale small storage lattices that can be used to storage. In this way, even if the battery case is broken and oxygen enters, the oxygen molecules will be too large to enter these small storage cells, so that lithium atoms will not react with the oxygen to avoid explosion.  4.2 Li-ion Battery4.2.1 TerminologyLithium-ion battery is a type of batteries with non-aqueous electrolyte that uses lithium alloy metal oxides as anode material, graphite as cathode material.Li-ion batteries currently include liquid lithium-ion batteries (LIB) and polymer lithium-ion batteries (PLB). Among them, the liquid lithium ion battery refers to a secondary battery whose Li + is compound. The positive electrode uses lithium cobaltate and lithium manganate, and the negative electrode uses a lithium-carbon interlayer compound. Li-ion batteries have advantages of high operating voltage, small size, light weight, high energy, no memory effect, no pollution, small self-discharge, and long cycle life. Note:Reaction on anode: LiCoO2==Li(1-x)CoO2+XLi++Xe-(electron)Reaction on cathode: 6C+XLi++Xe- = LixC6Total reaction: LiCoO2+6C = Li(1-x)CoO2+LixC6Its practicality has greatly reduced the weight and volume of portable electronic devices such as mobile phones and notebook computers, and the using time is greatly extended. Because lithium-ion batteries do not contain heavy metal cadmium, compared with nickel-cadmium batteries, the environmental pollution is greatly reduced. 4.2.2 Li-ion Battery Characteristics High energy densityThe weight of a Li-ion battery is half that of a nickel-cadmium or nickel-hydrogen battery of the same capacity, and the volume is 20-30% of a nickel-cadmium battery and 35-50% of a nickel-hydrogen battery. High voltageThe operating voltage of a lithium-ion battery cell is 3.7V (average value), which is equivalent to three nickel-cadmium or nickel-metal hydride batteries connected in series. Small pollutionLi-ion batteries do not contain harmful metal substances such as cadmium, lead, and mercury. No lithium metalLi-ion batteries do not contain metallic lithium, so they are not subject to the ban imposed by airlines of carrying lithium batteries in passenger aircraft. Long cycle lifeUnder normal conditions, the charge-discharge cycle of a lithium-ion battery can exceed 500 times, and a iron phosphate battery can reach 2000 times. No memory effectThe memory effect refers to the phenomenon that the capacity of the battery decreases during the charge and discharge cycle of the nickel-cadmium battery. Lithium-ion batteries do not have this effect. Quick chargeUsing a constant current & voltage charger with a rated voltage of 4.2V, the lithium-ion battery can be fully charged in 1.5 ~ 2.5 hours; and the newly developed lithium iron phosphate battery can be fully charged in 35 minutes. 4.2.3 Matters of UseKeeping lithium-ion batteries regularly charged and discharged can extend battery life. Lithium-ion battery power is maintained at 10% ~ 90% is better for the battery. This means that you don't need to reach 100% when charging batteries for digital products such as mobile phones and laptops. Under normal circumstances, 50% of the power is best for lithium-ion battery storage.When digital products equipped with lithium-ion batteries are exposed to sunlight or stored in hot cars, it is best to turn these products off because lithium-ion batteries will age faster if the operating temperature exceeds 60℃. 4.2.4 Li-ion Battery SelectionLi-ion batteries are divided into liquid lithium-ion batteries and polymer lithium-ion batteries. The electrolyte of a lithium-ion battery is fluid, so it is more unstable than a lithium polymer battery, and it may explode if it is hit by an external force or if a non-compliant charger is used. And now that the popularization of portable electronic products such as smart phones, e-books, tablets, and laptops uses batteries as a power source, battery hidden troubles will break out at any time. To prevent these, we must pay attention to the following:1) The capacity is clearly marked. Batteries without a clearly marked capacity (such as 1000mAh) are likely to be inferior or recycled.2) Standby time. It is the continuous use time from the time the battery is loaded to the next charge.3) Safety protection circuit board. Without it, the lithium battery is at risk of deformation, leakage, and explosion.Lithium Ion Vs Lithium Polymer BatteriesⅤ ApplicationWith the development of microelectronic technology, more and more miniaturized devices have been put forward, which places high requirements on power sources. Lithium batteries have subsequently entered a large-scale practical stage.The earliest application was lithium sub primary battery, used in pacemakers. Due to the low self-discharge rate and gentle the discharge voltage, this makes it possible to implant the pacemaker into the human body for long-term use.Lithium manganese batteries generally have a nominal voltage higher than 3.0V, which is more suitable for integrated circuit power supplies and is widely used in computers, calculators, and watches.Li-ion batteries are widely used in mobile phones, notebook computers, power tools, electric vehicles, street light backup power supplies, navigation lights, and small household appliances, which can be said to be the most popular type.Ⅵ Battery Security6.1 Battery Storage6.1.1 Lithium BatteryPrimary lithium battery can be discharged continuously or intermittently. Once the power is exhausted, it can no longer be used, and it is widely used in electronic products with low power consumption such as cameras. It has a low self-discharge rate and can be stored for up to 3 years. In addition, it is good to store lithium primary batteries in low temperature to get better storage.Note: Lithium primary batteries are different from lithium ion batteries, the former cannot be charged. 6.1.2 Li-ion BatteryAlso called secondary lithium battery. It can be stored for more than half a year at 20°C. This is due to its low self-discharge rate and most of its capacity can be recovered.The self-discharge phenomenon e4xists in lithium batteries. If the battery is stored below 3.6V for a long time, it will cause the battery to over-discharge and damage the internal structure of the battery, reducing the battery service life. Therefore, long-term storage of lithium batteries should be recharged every 3 to 6 months, that is, keeping the battery voltage at 3.8 ~ 3.9V, and it is appropriate to maintain the discharge depth at 40% ~ 60%. The battery should be stored in a dry environment at 4 ℃ ~ 35 ℃ or in a moisture-proof packaging. In addition, Keep away from heat sources and sunlight.Storage requirements: In the environment with a temperature of 20 ± 5℃ and a humidity of no more than 50%, the air and water vapor must be prevented from contacting the aluminum foil during transportation. 6.2 Charging Rules Charging voltageGenerally, the battery voltage of a mobile phone is 3.7V, but the voltage of a general charger is 5V, but it will not affect the use. Shallow charge and dischargeThis is more beneficial for lithium batteries. Only when the power module of the product is calibrated for lithium batteries, it is necessary to deepen and deep charge. Therefore, lithium-ion-powered products do not have to be constrained by the process. Overcharge and overdischargeThe rated voltage of a lithium-ion battery is generally 3.7V. Depending on different materials, the positive electrode of lithium iron phosphate is 3.2V. The international standard for termination charge voltage when fully charged is 4.2V, and iron phosphate is 3.6V. Overdischarge or self-discharge reaction at low voltage will cause decomposition and destruction of lithium active material, and may not be recovered. And any kind of overcharging of lithium-ion battery will cause severe damage to the battery performance and even cause explosion. Therefore, the lithium-ion battery must avoid overcharging during the charging process.6.3 Battery Explosion6.3.1 Explosions ExpressThe type of battery cell explosion can be summarized into three types: external short circuit, internal short circuit, and overcharge. Here, the “external” refers to the outside of the battery cell and includes short circuits caused by poor internal insulation design of the battery pack. When a short circuit occurs outside the battery cell and the electronic component fails to cut off the circuit loop, high heat will be generated inside the battery cell, causing some of the electrolyte to vaporize, which will expand the battery case.When the internal temperature of the battery reaches 135 degrees Celsius, a good quality separator paper will close the pores, the electrochemical reaction will be terminated almost, the current will drop suddenly, and the temperature will decrease slowly, avoiding the explosion. However, if the pore closing rate is too poor, or the separator paper with poor quality, the battery temperature will continue to increase, causing more electrolyte vaporize, and finally the battery case will be broken, even be exploded.The internal short circuit is mainly caused by piercing diaphragm by the burrs of copper foil and aluminum foil piercing the diaphragm, or dendritic crystals of lithium atoms.These tiny needle-like metals can cause micro-short circuits. The copper and aluminum foil burrs are caused during the production process, and the observed phenomenon is that the battery leaks too quickly, and most of them can be detected by the cell plant or assembly plant. Moreover, because the burr is small, it is sometimes blown out, which makes the battery return to normal. Therefore, this kind of explosion is less happened. Therefore, the explosion caused by the internal short circuit is mainly caused by overcharge.After overcharging, needle-shaped lithium metal crystals are everywhere on the pole pieces, piercing points are everywhere to make micro short circuits. Therefore, the temperature of the battery will gradually increase, and finally the electrolyte is vaporized at high temperature. In this case, whether the temperature is too high to damage electrode materials and the battery housing burns and explodes, both situations will cause an explosion.Based on the above types of explosions, we can focus on batteries protection in three aspects: overcharge, external short circuits, and improvement of battery safety.When designing a battery system, two electronic protections must be provided for overcharge, overdischarge, and overcurrent. Final protection method, the safety level of batteries, which can be roughly differentiated according to the ability to withstand short circuit and overcharge. In addition, before the battery explodes, if lithium atoms accumulate on the surface of the battery, the explosion power will be greater. Comparing the performance of aluminum shell cells with steel shell cells, aluminum shells have high safety advantages. Moreover, consumers use inferior chargers. Thus the ability of cells to resist overcharge is more important than the ability to withstand external short circuits. 6.3.2 Explosion Causes1) Large internal polarization2) The pole piece absorbs water and reacts with the electrolyte.3) The quality and performance of the electrolyte.4) The amount of injection does not meet the process requirements.5) Poor sealing performance during laser welding in assembly process.6) Manufacturing dust is easy to cause micro short circuit.7) The positive and negative plates are thicker according to technological requirements, and it is difficult to insert the case.8) Sealing problem of liquid injection, for example, poor sealing of steel ball causes air drum.9) The shell is too thick, and the deformation of the shell will affect the thickness.10) High external ambient temperature. 6.3.3 Protection MeasuresTo avoid over-discharging or over-charging due to improper use, a triple protection mechanism is provided in the single-cell lithium-ion battery. The first is the use of switching elements. When the temperature in the battery rises, its resistance value rises, if the temperature is too high, the power supply will automatically stop. The second is to choose an appropriate separator material. When the temperature rises to a certain value, micron-sized micropores on the separator will automatically dissolve, so that lithium ions cannot pass through, and the internal reaction of the battery stops. The third is to set a safety valve (that is, the vent hole on the top of the battery). When the internal pressure of the battery rises to a certain value, the safety valve will automatically open to ensure the safety of battery.Sometimes, although the battery itself has safety control measures, due to some reasons, for example, security control fails, or the lack of a safety valve, or the gas is too slowly to release through the safety valve, therefore, the internal pressure of the battery will rise sharply and cause an explosion.In general, the total energy stored in a lithium-ion battery is inversely proportional to its safety. As the battery capacity increases, the battery volume also increases, its heat dissipation performance becomes poor, and the possibility of accidents will increase significantly. For Li-ion batteries for mobile phones, the basic requirement is that the probability of a safety accident is less than one in a million. For large-capacity lithium-ion batteries, especially electric vehicles, the use of forced heat dissipation is particularly important.Choose a safer electrode material, for example lithium manganate material, to ensure that the molecular structure is fully charged, the lithium ions of the positive electrode have been completely embedded in the carbon pores of the negative electrode to avoid the generation of dendrites is fundamentally. At the same time, the stable structure of lithium manganate makes its oxidation performance much lower than that of lithium cobaltate, and the decomposition temperature exceeds 100 °C of lithium cobaltate. The danger of burning and explosion caused by the precipitation of metallic lithium is avoided when having short circuit or overcharge.After the lithium battery cell is overcharged to a voltage higher than 4.2V, side effects will begin to occur. The higher the overcharge voltage, the higher the danger. Because the number of lithium atoms remaining in the positive electrode material is less than half, at this time, the storage cell collapses, causing the battery capacity to permanently decrease. If you continue to charge, since the storage cell of the negative electrode is already filled with lithium atoms, subsequent lithium metal will accumulate on the surface of the negative electrode material. These lithium atoms will grow dendritic crystals from the surface of the negative electrode toward the lithium ions. These lithium metal crystals will pass through the separator paper, making the positive and negative electrodes short-circuit. Sometimes the battery explodes before a short circuit occurs.When at a  overcharge process, materials such as the electrolyte will vaporize, which will cause the battery case or pressure valve to swell and rupture, allowing oxygen to enter and react with the lithium atoms accumulated on the negative electrode surface.Therefore, when charging a lithium battery, the upper limit of the voltage must be set to guarantee the battery life, capacity, and safety. The optimal charging voltage limit is 4.2V. There is also a lower voltage limit when the lithium battery is discharged. When the cell voltage is lower than 2.4V, some materials will start to be destroyed. In addition, when the lithium battery is discharged from 3.0V to 2.4V, the released energy accounts for only about 3% of the battery capacity. Therefore, 3.0V is an ideal discharge cutoff voltage. When charging and discharging, the limitation of current is also necessary. If the current is too large, lithium ions have no time to enter the storage cell, and will collect on the surface of the material, which will affect the battery performance.After these lithium ions have obtained electrons, lithium atom crystals will be generated on the surface of the material, which will cause danger, like overcharge. Therefore, the protection of lithium-ion batteries must include: the upper limit of the charging voltage, the lower limit of the discharge voltage, and the upper limit of the current. In general, except the lithium battery cell, there is a protective plate in the lithium battery pack.Ⅶ Development ProspectsTo develop more excellent batteries, various materials have been studied. For example, lithium sulfur dioxide batteries and lithium thionyl chloride batteries are very characteristic. Their positive electrode active materials are solvents for the electrolyte. This structure made only in non-aqueous electrochemical systems. Therefore, the research of lithium batteries has also promoted the development of electrochemical theory of non-aqueous systems. Except the use of various non-aqueous solvents, polymer thin film batteries has also been studied.Lithium batteries are widely used in energy storage systems such as hydropower, thermal power, wind power and solar power, telecommunications, electric vehicles, military equipment, aerospace and other fields.Lithium-ion batteries have been widely used in portable appliances such as laptop computers, video cameras, and mobile communications due to their unique performance advantages. With the shortage of energy and environmental protection, lithium battery is widely used in the electric vehicle industry, especially the emergence of lithium iron phosphate material batteries, which has promoted the development and application of the lithium battery industry. Ⅷ Questions Related to Lithium & Lithium-ion Batteries1. Is a lithium battery the same as a lithium ion battery?Lithium batteries feature primary cell construction. This means that they are single-use—or non-rechargeable. Ion batteries, on the other hand, feature secondary cell construction. This means that they can be recharged and used over and over again. 2. Do lithium-ion batteries need a special charger?Ultimately, using a battery charger with a specific Lithium charge algorithm is the best option for maximum performance and lifespan of any lithium battery. 3. Can you overcharge a lithium battery?In a lithium-ion battery, overcharging can create unstable conditions inside the battery, increase pressure, and cause thermal runaway. ... At best, this will lead to reduced capacity and shortened life cycle, and at worst this could cause thermal runaway. 4. Which is better lithium ion or lithium polymer battery?High powerBoth lithium-ion and lithium-poly batteries are suitable with high and robust power usages. However, lithium-ion batteries are more efficient and popular than lithium-polymer. They have higher energy levels and powers and are more suitable for heavy usages. 5. What is the difference between a lithium battery and a lithium-ion battery?Lithium batteries feature primary cell construction. This means that they are single-use—or non-rechargeable. Ion batteries, on the other hand, feature secondary cell construction. This means that they can be recharged and used over and over again.