Nikon MB-D15 Multi-function Battery Grip
The MB-D15 Multi-Power Battery Pack is compatible with three different power sources; one EN-EL15 Rechargeable Li-ion Battery, six AA-size alkaline, Ni-MH or lithium batteries (an EN-EL15 is supplied with the camera; AA batteries are available separately) and the EH-5b AC Adapter (with EP-5B Power Connector). When one EN-EL15 is loaded in the D7100 and another in the MB-D15, you can shoot up to approx. 1900 frames*. The Multi-Power Battery Pack comes equipped with AE-L/AF-L button, main/sub command dials, shutter-release button and multi selector, that are handy for vertical shooting. It employs magnesium alloy equivalent to that for the D7100 body to achieve superior dust-prevention and weather-resistant performance.
*Based on CIPA Guidelines.