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
Nikon D7100 Digital Camera Battery Lithium Ion (2100 mAh 7.0v) - Replacement For Nikon EN-EL15 Battery - Walmart.com