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Green Extreme MB-D15 Battery Grip for Nikon D7100 & D7200 With EN-EL15 Battery GX-MB-D15-K1
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Amazon.com: Green Extreme Multi Power Battery Grip (MB-D15 Replacement) for Nikon D7100 & D7200 DSLR Camera, Holds EN-EL15 Battery or 8 AA Batteries : Electronics