The Canon BG-E7 for the Canon EOS 7D can accommodate up to 2x LP-E6 batteries or 6xAA batteries.

The Canon BG-E7 Battery Grip holds up to two LP-E6 battery packs or six AA Batteries to offer double-length shooting time. The vertical shutter release makes shooting with the camera in a vertical position just as comfortable as shooting horizontally. The following functions are available in the vertical shooting position. Shutter-Release, Main Dial, AF Point Selection, AF/FE Lock, Index, Aperture, Exposure Compensation Button, Reduce Button.