How Does Rechargeable lithium battery type 21700, 3.6V 4000mAh Work?

1.What is the battery?

The battery is another lithium-ion battery, and the number denotes the cell size. It comes in 21mm in diameter and 70mm in length. The  battery comes with an ampere power between mAh and mAh.

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While compared to lithium batteries, it is more significant in length and diameter. The lithium ion battery has a technical design to offer a voltage range between 2.5v to 4.2v and a charging voltage of 4.2v. However, the nominal voltage of battery  will be 3.7v. The battery requires about 5 hours for a full recharge, but the charging time may vary subject to the charger voltage, amperage, and battery type.

2.How much does a battery cost?

The price of a lithium ion battery or any other battery depends on various factors. The price may vary depending on the brand's popularity, charging and discharging cycles, battery chemistry, power capacity, protective features, etc. On a general perception, the cost of a battery is between $6.95 to $28.95.

3.What is battery used for?

Like lithium batteries, cells also power many electronic and luminary devices. These batteries are used on flashlights, and electric vehicles. Since these batteries are rechargeable, they can use in all devices that come with built-in rechargers and need a voltage requirement of 3.2/3.7v.

4.How long does a battery take to charge?

A battery pack can typically charge within 4 hours; however, the charging time depends on the charger and battery capacity. You can quickly recharge a battery with a fast recharger than with a slow recharger.

These statistics show that you must use a recharger with a higher capacity for quick recharging.

The lithium ion battery comes with -mAh, so you should use a charger matching the battery capacity for fast charging. If you use a 2A charger to recharge a mAh battery, it will take about 2 hours to complete the charging. Similarly, if you use a 1A charger, the recharging timing will be approximately 3-4 hours.

5.How much does a battery weight?

The weight of a battery will be between 55gms to 75gms, depending on the technology and capacity.

6.Are the same as ?

Both and cells are not the same. Their physical dimension is different to one another. When comes with 18mm diameter and 65mm length, the battery comes with 21mm diameter and 70mm height. The last digit '0' denotes its cylindrical shape. Both are identical in shape, i.e., both are cylindrical. However, is slightly bigger than ; hence,when the battery type is the same, can offer more power than batteries.

On the capacity segment, offers mAh to mAh, while offers mAh to mAh. Both can provide 3.7v output, but the output current of lithium-ion battery is more than 36Amps, but battery offers more than 25Amps.

lithium ion battery has 35% more cell capacity than batteries. Similarly, the energy density of a battery also shows an increment of 20%. As per the data released by Tesla, the energy density of was 250Wh/kg, but when they started using batter, the energy density registered as 300Wh/kg. The energy density of battery in volumetric terms stands 20% higher than batteries.

The volume of a battery is cubic mm, and  battery is cu mm, which means the latter has ~47% more volume. If we consider 10-12% of the volume space used to incorporate the protective features, the batteries still have room to produce more power. So, considering all these factors, and batteries are not the same. Since  battery has extended battery life and high output, it has a better edge over batteries.

7.Which battery is better vs ?

In the lithium battery segment, bigger batteries have high power delivery advantage than smaller batteries. Bigger batteries will have extended battery life than smaller batteries and a better amp rating. While comparing and battery, both have the same length, but one has a 20mm diameter, and the other has a 21mm diameter. Even though both have no considerable difference, batteries shall have a better amp rating and can discharge 30-45 amps continuously.

8.Can I Use batteries in my vape?

Yes, you can use lithium ion batteries in the vaping device. These batteries are the upgraded version of and batteries. The lithium ion batteries are larger than and , hence can deliver more amps continuously. Many companies are using lithium ion batteries for their vaping devices.

9.Are all batteries rechargeable?

The lithium ion batteries are rechargeable. Because of this, it has been used in electric vehicles, vaping devices, flashlights, and many other devices that require power to operate.The beauty of batteries is their size and power delivery capacity. Let us examine a projected situation to understand the convenience of using lithium ion batteries instead of other batteries.

Suppose you want to run a BTU cooling capacity air conditioner that consumes about watts per hour; you can run the air conditioner for one hour by using a battery pack of 74 cells. But to accomplish this task, you must use a lithium ion battery with 3.7v and mAh that can store 3aH to 5aH power and store about 11–18-watt hours.

①Limits of Recharging

All lithium-ion batteries are rechargeable, and they will have a limited recharge cycle. Due to chemical degradation and oxidation, the battery recharging cycle gets degraded over a period. All batteries do have these issues. The lithium ion batteries feature - cycles.

② Recharge Frequency of Batteries

Lithium batteries come with a rechargeable feature, and a battery will have - recharge cycles. So, your recharging pattern will decide the battery life. When your battery voltage reduces to 3v from 3.7v, you can put it for recharge. Frequent recharging may reduce the life of the battery, but not so for lithium-ion batteries. Because lithium-ion batteries have no memory effect.. Therefore, instead of going for a regular recharge, check the voltage level, and if it drops below 3v, do a recharge. If a lithium-ion battery voltage drip down to 2.5v, the battery may lock by itself, making it impossible to recharge using an ordinary recharger.

10.Which battery is best?(samsung,lg,panasonic,sony, which is best? )

In the best battery segment, Panasonic stands top. The mAh battery shows a continuous discharge rating of 30A and a nominal voltage of 3.7v. Because of the constant high voltage delivery, it reduces battery usage. The rechargeable battery offers + life cycles, and it can deliver 75 watts. It's high energy density minimizes the battery weight and size. These batteries are famous for their efficiency and can use for an extended period. The battery does not have any memory accumulation issues; hence you can always get a full charge after every recharge.

The LG50 lithium-ion battery is available with an energy capacity of mAh with a nominal voltage of 3.6v is our 2nd preference. The battery can offer a full charge voltage of 4.2v with a variation of +/- 0.05v. With a maximum continuous discharge rate of 7.27A and discharge cut-off voltage of 2.50v, this is an ideal battery for electronic devices that consume low power for an extended period. The battery comes with 500 recharge cycles, but you can recharge it + cycles if appropriately used. It is an unprotected battery, so it is best to use a protected battery management system.
Our third preference is the Sony lithium-ion battery USVTC6A which comes with mAh. It can offer a 40A continuous discharge at a 3.6v nominal voltage and a maximum of 4.2v. It is rechargeable but unprotected. You should use it with a protected battery pack. With a 9A recharger, it can recharge quickly and can let you have 500+ recharge cycles. It sells for US$9 per piece, and with a 3-year shelf life, it is a good option for using high-drain electronic devices that require minimum discharge rates.

Among various lithium ion batteries, Samsung 40T (Lithium Manganese Nickel -LiNiMnCoO2) has better market acceptance than the rest of the competitors and is one of the famous brands. The battery comes with mAh and can deliver 25A continuous power discharge with a maximum discharge current of 35A or 45A with a temperature cut off mark at 80°C. It can let you use 75W continuously without any break for an extended period. It comes with 250+ cycles with a 6A charger and can recharge more than 500 times if appropriately recharged. The battery’s market price is about $7.50 per unit.

Model

Size

Chemistry

Voltage

Capacity

Discharge

Cycles

Panasonic

21x70

INR

3.56v-3.6v

mAh

15A-20A

+

LG50

21x70

INR

3.63v

mAh

7.27A

+

Sony VTC6A

21x70

INR

3.6v-3.7v

mAh

30A

500+

Samsung 40T

21x70

Link to SINC

INR

3.6v-4.2v

mAh

35A

250+

11.Dose Tesla use battery

①Are the same as ?

Previously Tesla has been using lithium batteries to power their electric vehicles. Now they are using cells for new model electric vehicles. As per the data released by Tesla, the energy density of lithium ion batteries is 20% more than batteries. The increased energy density is mainly attributed to the size and new battery chemistry.

Another critical aspect of batteries compared to batteries are their price. As per the data released by Tesla, the cost is less by 9% compared to batteries, which was about $185. The cost of batteries stands around $170. When the system costs about $171 per MH, the will be 9% less and may touch about $155 per Zhn.As per industry experts, the component and weight can also be reduced by 10% by using lithium-ion batteries rather than batteries. So, if the weight of the battery is less, that will eventually have an advantage over the energy density of the vehicle.

② Tesla battery

Tesla has been using batteries for their S and X model vehicles, but for the new Model 3 cars, they are using batteries. These batteries have 46% more cell volume than batteries. Also, as per a report released by Tesla, they are 15% more energy efficient. They have a cell capacity of 21.275Wh and show an energy density of ~877.5Wh/L.

12. Lithium-ion Batteries - Final thoughts

The lithium ion batteries are the best-preferred option for electronic devices and electric vehicles because it comes with ~35% more cell capacity and hence can produce 20% more energy than batteries. These batteries show moderate resistance to temperature fluctuations and short circuit issues. So, they are ideal for devices that require low power drain for an extended period.

The lithium ion batteries are rechargeable, and by using quick rechargers, you can get the battery charged to the required voltage level. Another highlighted feature of the best lithium on batteries is their nominal voltage discharge rates. They can deliver 3.7v on average and can deliver a maximum of 4.2v.

However, while purchasing the best lithium-ion battery, you need to check its mAh and discharge rates, marked as C-rate. If the discharge is too high, then there is no point in having a battery with high capacity. On average, lithium-ion batteries will have a power capacity of to mAh, but they should also have a corresponding slow discharge rate.

When the discharge rate is very high, it will drain your battery quickly. So, the best way to ensure the discharge rate is whether the C-rate matches the power capacity. If the power capacity is mAh, then the C-rate should be 30A, and if the power capacity is mAh, then the C-rate should be 50A. Any discharge rate more than the corresponding power capacity will fail to give the expected result. Similarly, check the battery's nominal average voltage level.

Any  lithium ion battery with a nominal voltage of 3v is good if it matches your device’s requirement. So, you must check the nominal voltage requirement before deciding on the battery and make sure the battery can match the voltage requirement with the nominal voltage offered by the battery.All cells may look the same in their physical appearance because of their size, 21mm diameter and 70mm length. However, their internal chemistry will be different from one another; their power output, continuous discharge rate, maximum power capacity, and voltage may vary according to the brand and model. Some batteries have protected features, and some don't have that feature. Therefore, you must select battery, matching the device's voltage and power requirement; otherwise, it may damage your device.

What is the Battery?

The battery is a rechargeable lithium-ion battery with a cylindrical shape, measuring 21 mm in diameter and 70 mm in length. It has a nominal voltage of 3.6V to 3.7V and is increasingly popular for its higher capacity, making it ideal for high-drain devices like flashlights. With a capacity ranging from mAh to mAh, the battery offers up to 42% more capacity than the battery.

Its energy density is around 300Wh/kg, surpassing the 's 250Wh/kg. Weighing between 60g and 80g, it typically takes about 4 hours to charge, depending on the charger and battery type. Available in both protected and unprotected variants, protected batteries include a built-in protection circuit to prevent overcharging and over-discharging. The battery can withstand between 300 to recharge cycles and is commonly used in devices such as flashlights, electronics, laptops, vaping devices, power tools, and some electric vehicles.

Battery Features

The battery is a rechargeable lithium-ion battery with a cylindrical shape, 21 mm in diameter and 70 mm in length. It typically has a voltage between 3.6V and 3.7V. Below are the key features of the battery:

Capacity: It can hold mAh or more, higher than the battery. The capacity can vary, ranging from mAh to mAh.

Energy density: The batteries have an energy density ranging from 250 Wh/kg to 300 Wh/kg.

Size and weight: The battery's dimensions are 70 mm in length and 21 mm in diameter3. The weight typically ranges from 50 to 70 grams.

Voltage: The voltage of a battery typically varies between 3.6V to 3.7V when it’s in use.

Types: batteries can be protected or unprotected2. Protected batteries generally have a button top, while unprotected ones typically have a flat top.

Charge cycles: A battery can last between 500 to charge cycles, depending on its chemistry, usage, and maintenance.

The battery is used in devices such as electric vehicles, flashlights, and power tools.

Battery Dimensions

Battery Specifications

Specification Details Battery Type Lithium-ion (Li-ion) Nominal Voltage 3.7V Charging Voltage 4.2V ± 0.05V Capacity mAh - mAh Continuous Discharge Current 10A - 20A Peak Discharge Current 30A - 50A Energy Density 150 Wh/kg - 250 Wh/kg Weight 60g - 70g Dimensions (L x D) 21mm x 70mm Operating Temperature -20°C to 60°C Storage Temperature -20°C to 25°C Cycle Life 500 - cycles Internal Resistance 30mΩ - 80mΩ

Battery Applications

batteries are lithium-ion rechargeable cells with a diameter of 21mm and a length of 70mm. They are used in various high-demand applications due to their high energy density, long lifespan, and reliable performance. Below are some common applications of the  Battery:

Electric Vehicles (EVs): Due to their high energy density and ability to provide a long driving range on a single charge, batteries are utilized in electric cars (like Tesla), e-bikes, and e-scooters. Tesla reported that after using battery packs, battery capacity increased by 35%, and energy density increased by about 20%.

Portable Electronics: Many portable devices like laptops, flashlights, power banks, and vape mods are powered by batteries because they provide a high capacity in a compact size. High-performance flashlights utilize cells for extended run times.

Energy Storage: batteries are used in energy storage systems for renewable energy applications, such as solar and wind power systems.

Power Tools: Companies like DeWalt and Makita use cells in their cordless power tools for improved runtime and power output.

Drones: Drones that need extended flight times and higher power output rely on batteries for their long-lasting power.

Motorcycle battery power supply: Motorcycle charging systems use a battery to provide power for starting the bike and to buffer electric energy. The battery is charged by a generator driven by the engine.

Compared to batteries, batteries have a higher energy density and capacity, typically ranging from mAh to mAh. Although batteries are more expensive and larger than batteries, their advantages make them suitable for high-power devices.

Battery Equivalent

Battery Type Dimensions (Diameter x Length) Typical Capacity Common Applications 21mm x 70.0mm -mAh Electric vehicles, power tools, high-performance flashlights 18mm x 65.0mm -mAh Laptops, flashlights, electric vehicles 20mm x 70.0mm -mAh High-drain devices, power tools 26mm x 65.0mm -mAh High-capacity flashlights, solar power storage

The battery has become increasingly popular due to its optimal balance between size and capacity, making it ideal for high-drain applications. While batteries remain widely used, the offers higher capacity in a slightly larger form factor. The battery serves as a close alternative, while the provides even greater capacity at the cost of increased size. Each battery type has its specific applications, with the being particularly favored in electric vehicles and high-performance power tools due to its excellent energy density and discharge capabilities.

Advantages of Using Battery

Compared to its predecessor, the battery, the battery provides a higher energy density, a longer lifespan, and greater power output. The battery measures 21mm in diameter and 70mm in length, while the battery measures 18mm in diameter and 65mm in length. Below are some advantages of batteries:

Higher Capacity: The typically offers a capacity between mAh and mAh, while the ranges from mAh to mAh. The battery can reach a maximum capacity of mAh, a 42% increase from the .

Improved Efficiency: With its higher capacity, fewer cells are needed to achieve the same battery pack size, which reduces complexity.

Better Thermal Management: The cells handle heat more effectively because their larger size spreads heat over a greater area, leading to better performance and safety, especially under high loads.

Longer Lifespan: Enhanced thermal management and energy density contribute to a longer overall battery lifespan. The allows for better performance over more charge cycles compared to cells.

Enhanced Performance: E-bikes with battery packs often experience more consistent power delivery, which translates to smoother acceleration and better handling, especially on challenging terrains.

Cost-Effective: s are cheaper relative to capacity and simplify the building of battery packs. The price of the lithium battery pack is expected to be lower than the battery pack.

Higher Energy Density: batteries typically have an energy density ranging from 250 Wh/kg to 300 Wh/kg, a notable improvement compared to batteries, which usually offer around 180 Wh/kg to 250 Wh/kg. The battery's power density can increase by 20% or more compared to the .

The high energy density and reliability of the make it versatile across various industries and ideal for high-drain applications like electric vehicles.

vs Battery

Feature Battery Battery Size 21mm diameter, 70mm length 18mm diameter, 65mm length Capacity Up to mAh Up to mAh Energy Density ~300 Wh/kg ~250 Wh/kg Max Power Output Up to watts Up to 800 watts Cost Generally more expensive More affordable Availability Fewer compatible devices, higher cost More common, widely compatible with devices Performance Better for high draw/discharge applications Suitable for lower-power applications Longevity Fewer cells in a battery pack improve longevity More cells can result in more variability Suitability Ideal for high-power devices (e.g., EVs, power tools) More suited for moderate-power devices (e.g., flashlights, small gadgets) Newer Trends Larger cells like the are emerging Smaller cells are still widely used

The and batteries are both widely used lithium-ion battery types but differ significantly in terms of size, capacity, and performance. The battery is larger, with a higher capacity (up to mAh) and better energy density (around 300Wh/kg) compared to the 's maximum capacity of mAh and energy density of 250Wh/kg. This means the battery is better suited for high-power, high-drain applications like electric vehicles (EVs), power tools, and devices requiring extended usage times. It can also handle higher power outputs, up to watts, which is advantageous for applications that demand significant power.

On the other hand, the battery is more affordable and commonly used in smaller devices like flashlights and portable gadgets. It generally has a lower energy density, but its smaller size and cost-effectiveness make it ideal for less power-hungry applications. Additionally, there are more devices compatible with the battery, making it more accessible and versatile in the market.

The ’s higher energy density also results in longer battery life for devices like the Fenix HT18 hunting flashlight, which can provide brighter and more sustained lighting than the . However, the larger size and higher cost of the might make it less suitable for applications where cost and space are primary concerns.

Comparison between , , and batteries

Here is the comparison between the , , and batteries:

Feature Battery Battery Battery Size 18mm diameter, 65mm length 26mm diameter, 65mm length 21mm diameter, 70mm length Capacity mAh to mAh mAh to mAh mAh to mAh Voltage 3.6V to 3.7V 3.6V to 3.7V 3.6V to 3.7V Applications Laptops, flashlights, vaping devices High-drain applications (e.g., EVs, power tools, solar systems) Consumer electronics, EVs, renewable energy storage Performance Compact and reliable for low-to-medium power devices High-power applications, extended run-time Balanced for high-power applications, higher discharge rates Cost Generally more affordable More expensive Generally more expensive Availability Widely available, common in the market Less common, limited availability Increasing availability, especially in EVs and consumer electronics Lifespan 300-500 cycles 500-800 cycles 500-800 cycles Emerging Trends Long-standing presence, well-established in the market Larger cells for high-drain applications Newer size with advanced chemistries, gaining popularity

Summary

The , , and batteries are each unique in their size, capacity, and power requirements, which render them suitable for a variety of applications.

• batteries are the most compact and are frequently employed in consumer electronics, including laptops, flashlights, and vaporizer devices. They are widely available and affordable, and they provide a dependable solution for low-to-medium power applications. Nevertheless, they possess the lowest capacity and lifespan in comparison to the other two sizes.
• batteries are larger and have a higher capacity, with a capacity spanning from mAh to mAh. They are optimal for high-drain applications, including solar energy storage systems, power tools, and electric vehicles. They are appropriate for devices that necessitate high output and extended runtime due to their capacity to manage continuous power draw. However, they are generally more expensive and less prevalent than the .
• batteries provide a balance between capacity and dimensions, with a typical range of mAh to mAh. Power-hungry applications such as electric vehicles and advanced flashlights, they are acquiring popularity in consumer electronics and electric vehicles, as they offer superior performance compared to batteries. The battery is becoming a new standard for high-performance devices due to its higher discharge rate and lifespan of 500-800 cycles, which surpasses that of the .

In conclusion, the is the most cost-effective and widely accessible option for low-to-medium power requirements. For high-power applications, the and are more appropriate. The is a more recent technology with more sophisticated chemistries and is increasingly being used in electric vehicles and other high-drain devices.

Are and Batteries interchangeable?

While you can use a battery instead of an , ensure your device supports it. The is larger (21mm x 70mm) than the (18mm x 65mm), so it may not fit in all devices. Always check specifications before replacing batteries. From a chemistry and voltage standpoint, there is no reason an battery won't work in your -size flashlight. However, the batteries are simply too short and narrow to make a solid connection. If you want to still use your batteries, look for battery flashlights that include an battery magazine like the NEW P12. This special adapter will make up for the extra length and diameter and allow you to use either size battery in your flashlight interchangeably. Both battery types typically operate at a nominal voltage of around 3.7V, making them electrically compatible. However, ensure that your device can handle any potential variations in voltage output.

In some cases, substituting a for an may be feasible if: The device has adjustable battery compartments capable of accommodating larger cells. The application does not require strict adherence to size specifications. You are using custom-built devices where you can modify the battery compartment. They technically all can since a has the same lithium technology and voltage as an . The only issue is physical compatibility.

How Long Do Batteries Last?

The lifespan of a battery is influenced by several factors, including its chemistry, usage, maintenance, and charging habits. On average, a battery can last between 500 to charge cycles before it starts to lose capacity, though some models can endure anywhere from to recharge cycles. Compared to smaller batteries like the , batteries are better at handling daily wear and tear. Using a lower amp charger can help reduce stress on the battery, thereby extending its lifespan. Proper storage is also crucial—keeping the battery in a cool, dry place and avoiding exposure to high heat or freezing conditions can prevent performance degradation. With proper care, a battery can last between 3 to 6 years, typically with 300 to 500 charge/discharge cycles, offering longevity and reliable performance over time.

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