Designed to extend an optic's battery life, the Mini QD External Battery is a picatinny-mounted battery pack that delivers continuous charging with a universal USB Type A cable. With a battery life indicator and a durable flame-retardant ABS body, this external battery pack is a great addition to any shooter's toolkit. USB Cable Magnetic USB Cable Rechargeable lithium-polymer battery Patent-pending toolless quick detach mount 6,000 mAh capacity Powers devices with all USB formats Flame retardant ABS body Battery life indicator LED