The Nikon MB-D10 Grip Multi Power Battery Pack allows the Nikon D300 D300s & D700 to be powered by two EN-EL3e batteries simultaneously - one in the camera body and one in the MB-D10 - effectively doubling your shooting capacity. The MB-D10 also provides a comfortable vertical grip with an additional shutter release and scroll wheel for easy access to the camera functions when shooting in the vertical orientation. With the included MS-D10 AA battery holder users can power the camera with 8 AA batteries or use a Nikon EN-EL4 or EN-EL4A battery (not included) with optional BL-3 Battery Chamber Cover to obtain higher frame advance rates (8 Frames per second in the D300) than the EN-EL3e battery can provide.