The Nikon MB-D10 Battery Grip is designed specifically for the Nikon D300, D300s and D700, and holds one extra Nikon EN-EL3e battery pack, six AA batteries, or a Nikon EN-EL4a when used with the Nikon BL-3 Battery Chamber Cover. It also features a vertical shutter release and extra camera controls for use while shooting in the vertical position.
