The MB-D12 multi-power battery pack increases the maximum frame advance rate
to 6 frames per second and extends autonomous operating time when using
batteries. It is ergonomically designed for improved grip with the camera in the
vertical shooting position and is powered by eight AA-size standard batteries or
a specific Nikon battery.
Features alternative shutter-release button, multi-selector and AF start
buttons for use when holding the camera in the vertical shooting position, as
well as secondary main- and sub command dials.