The Nikon MB-D10 Multi-Power Battery Grip allows the Nikon D300 and 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.