21700 Batteries

A 21700 battery is a type of rechargeable lithium-ion battery that is slightly larger than the more commonly known 18650 battery. The name “21700” comes from its dimensions: 21mm in diameter and 70mm in length. It is known for having a higher energy capacity compared to the 18650, allowing it to store more power in a similar form factor.

The 21700 battery is widely used in applications that require high energy density and longer runtime, such as electric vehicles (EVs), power tools, high-performance flashlights, and laptops. With capacities typically ranging from 4000mAh to 5000mAh, 21700 batteries provide more power and longer operational time than smaller lithium-ion cells.

Due to its higher capacity, the 21700 battery is increasingly popular in electric vehicles, including Tesla, which adopted this format in their Model 3 to enhance energy efficiency and overall performance. As technology advances, the 21700 is becoming the go-to option for applications where both power and size efficiency are critical.