Power your gear with the FenixA(R) Rechargeable V2.0 Battery. This Battery features over-charge protection, over-discharge protection, short-circuit protection, and overheating protection. Plus, pressure vents expel waste gas in the case of an internal short circuit, preventing explosion. New 21700 battery type 5000mAh high capacity Protection circuitry to prevent short circuits Pressure vents to prevent explosions 500 charge cycles