Made from a tough magnesium alloy, the BG-D800M for the Nikon D800 is the pro's choice - the ultimate battery grip. This battery grip can hold one EN-EL 15 or 8 AA size batteries to offer double-length shooting time. It is also equipped with a vertical-grip shutter button, dual controls dials, multi-function controller and an AF-ON bottom to make shooting with the camera in a vertical positions just as comfortable as shooting horizontally. The grip includes holders for AA and EN-EL 15 batteries.