The nikon MB-D12 is an ergonomically designed Battery, grip for the nikon
D800, D800e and D810 DSLR cameras. The grip allows you to attach additional
batteries for more power and extended shooting times (increases max frame rate
to 6 fps). The MB-D12 is supplied with two Battery, trays – one that offers
space for an EN-EL15 rechargeable Battery, and one that holds 8 AA batteries
(batteries not included). The MB-D12 Battery, grip also offers extra stability
and includes an 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.