21700 Battery Cells

A 21700 battery is a rechargeable lithium-ion cell widely used in modern technology. The name "21700" comes from its size: 21mm in diameter and 70mm in length. These batteries are highly regarded for their impressive capacity and energy density, making them ideal for demanding applications like electric vehicles, power tools, and powerful flashlights. Compared to the smaller 18650 batteries, 21700 cells provide more energy storage and have a longer lifespan while maintaining a low self-discharge rate. As their advantages become more recognized, many devices that traditionally used 18650 batteries are now adopting the 21700 format for improved performance and efficiency.