What'S The Difference Between 18650 And 21700 Batteries | KET

2025-06-29 What'S The Difference Between 18650 And 21700 Batteries

18650 and 21700 batteries are two common types of rechargeable lithium-ion batteries that are used in a wide range of electronic devices. The primary difference between them is their size and capacity.



18650 batteries have been widely used for many years and have become the standard size for many applications. They measure 18mm in diameter and 65mm in length. These batteries typically have a capacity between 1800mAh and 3500mAh.

On the other hand, 21700 batteries are relatively new and larger than 18650 batteries. They measure 21mm in diameter and 70mm in length. The increased size allows for higher capacity, with typical ranges between 4000mAh to 5000mAh.

The larger size of the 21700 battery makes it more suitable for high-performance applications that require more power, such as electric vehicles, power tools, and high-end flashlights.

In summary, while both 18650 and 21700 batteries are lithium-ion rechargeable batteries, the 21700 battery is larger and has a higher capacity than the 18650 battery, making it a better choice for high-performance applications that require more power.