L-ion IMR chemistry is potent yet stable, providing a reliable power source for portable electronic devices. The Acebeam 21700 Li-ion battery is designed for powering high-drain LED flashlights.This rechargeable IMR battery has an impressive 5100mAh capacity. The Acebeam 21700 battery features lithium manganese oxide chemistry, which provides incredible stability and power. In fact, this rechargeable cell is able to provide up to 20A of current, thus making it the perfect power source for premium lights and other portable electronics. The Acebeam 21700 battery is a larger and stronger power source than the more commonly-known 18650 and will take your premium devices to the next level in performance.