The MB-D18 Multi-Power Battery Pack offers both enhanced handling capabilities as well as extended battery life. It accepts one additional EN-EL15 lithium-ion battery pack to increase the camera's battery life or, alternatively, eight AA batteries can be used in conjunction with the included MS-D12 AA Battery Holder. The physical design of the grip improves shooting in the vertical orientation with the inclusion of a secondary shutter release button, AE/AF lock button, multi selector, and main- and sub-command dials.

Nikon MB-D18 Specs