Canon Battery Grip BG-E13 for Canon 6D is an optional power adapter specially designed for the Canon EOS 6D. It contains up to two LP-E6 batteries or six AA batteries, doubling the recording time. This is convenient when you are using Movie Mode, Live View Mode, and other modes that use more power. The BG-E13 contains various controls such as shutter buttons, main command dial, AF point select button, AE lock / AE lock button, AF start button, multi-controller, and multi-function button.