The CBP-C1 Compact Battery Pack from Bolt will boost the number of flashes and the recycle time of your compatible Canon, Bolt VX-series, Godox TT685 series, Nissin, Yongnuo YN685 series flash. The CBP-C1 can operate on four or eight AA batteries--alkaline, lithium, or nickel-hydride (NiMH). Lights on the pack indicate Standby, Recycle, or Low Power mode. A thermal protection switch prevents overheating. The CBP-C1 can provide up to 595 flashes per charge, and recycle times as fast as 1.24 seconds. The pack, which weighs just 7 oz without the batteries, can also be attached to the bottom of your camera using the tripod socket.