What is 21700 battery?
The 21700 battery is a type of rechargeable lithium-ion battery that has gained significant popularity in recent years. It is named after its dimensions, with a diameter of 21mm and a length of 70mm. This larger size compared to traditional 18650 batteries allows for a higher energy density and capacity.
The 21700 lithium ion battery offers several advantages over other battery types. Firstly, it has a higher energy density, meaning it can store more energy in the same size battery. This makes it ideal for applications that require long-lasting power, such as electric vehicles, energy storage systems, and portable electronic devices.
Secondly, the 21700 cells has a higher capacity, allowing it to hold more charge and provide longer run times. This makes it suitable for power-hungry devices like drones, laptops, and high-performance flashlights.
Additionally, the 21700 battery cells has a higher discharge rate, meaning it can deliver power more quickly. This makes it suitable for applications that require high power output, such as power tools and electric bikes.
Furthermore, the 21700 battery offers improved safety features compared to older battery technologies. It has better thermal stability and is less prone to overheating or thermal runaway, reducing the risk of accidents or battery failure.
In summary, the 21700 battery is a versatile and high-performance lithium-ion battery that is suitable for a wide range of applications. Its larger size allows for higher energy density, capacity, and discharge rate, making it ideal for electric vehicles, energy storage systems, portable electronic devices, drones, power tools, and more.
How to choose 21700 battery?
When choosing a 21700 battery, there are several factors to consider:
1) Capacity: Look for batteries with higher capacity ratings, typically measured in milliampere-hours (mAh). Higher capacity batteries will last longer between charges.
2) Voltage: Ensure that the battery voltage matches the requirements of your device. Most 21700 batteries have a nominal voltage of 3.6V or 3.7V.
3) Discharge Rate: Consider the maximum continuous discharge rate of the battery, often denoted by a "C" rating. Higher C ratings indicate the battery can deliver power more efficiently.
4)Internal Resistance: the internal resistance range of a 21700 battery is typically between 10-30 milliohms. A lower internal resistance indicates better battery performance, as it can provide higher current output and longer usage time. Therefore, lower internal resistance is crucial for high-performance applications such as electric vehicles and drones.
4) Brand and Reputation: Stick to reputable brands that have a proven track record for producing high-quality batteries. This helps ensure safety and reliability.
For China brand 21700 batteries, Molicel 21700, EVE 21700, Lishen 21700, Svolt 21700 are all popular for your choice. Below data listed for your better checking.
| Model No. | Capacity | Brand | Cycle Life | IR | Peak Discharge Current |
| LR2170LA | 4000mAh | LISHEN | ≥300 Times | ≤ 12mΩ | 10C |
| INR21700/40P | 4000mAh | EVE | ≥600 Times | ≤ 13mΩ | 12.5C |
| INR-21700-P42A | 4200mAh | Molicel | ≥500 Times | ≤ 15mΩ | 10C |
| 21700-4400mAh | 4400mAh | Svolt | ≥800 Times | ≤ 20mΩ | 3C |
| INR-21700-P45B | 4500mAh | Molicel | ≥500 Times | ≤ 15mΩ | 10C |
| 21700-5000mAh | 5000mAh | Svolt | ≥800 Times | ≤ 20mΩ | 2C |
| INR21700/50E | 5000mAh | EVE | ≥1000 Times | ≤ 20mΩ | 3C |
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