The MB-D10 multi-power battery pack increases the maximum frame advance
rate to 8 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 the EN-EL3E battery (listed under accessories above). 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.