The Canon BP-A30 Battery Pack for EOS C300 Mark II, C200, and C200B mounts on your camera and provides 45 watt-hours of power. It is a rechargeable lithium-ion battery compatible with Canon s Intelligent Battery system. The battery features a removable contact cover that can help keep the contacts clean and helps prevent short circuit discharges when the battery is not mounted on the camera. The battery incorporates a small push button that activates the remaining power indicators on the battery, allowing you to quickly determine the approximate power level of the battery without having to attach it to a camera.