If you’re shooting all day long and can’t be bothered to change out batteries in your Canon camera body that accepts LP-E6 batteries, the LP-E6A AC Power adapter allows you to plug your DSLR into a wall outlet for consistent, constant power. This is great if you’re shooting time lapses or working in a busy studio environment while using power intensive functions like live view. Just plug the dummy battery into the camera body and the plug into a wall outlet and you’re off to the races.
