Green Extreme MB-D15 Battery Grip for Nikon D7100 & D7200 With EN-EL15 Battery GX-MB-D15-K1
Nikon D7200 battery: what are the options?
Neewer® Vertical Battery Grip Replacement for MB-D15 Works with EN-EL15 Battery or 6 Pieces AA Batteries for Nikon D7100 D7200 Digital SLR Camera – neewer.com