Amazon.com: Synergy Digital Camera Battery, Compatible with Nikon D7100 Digital Camera, (Li-ion, 7V, 1600mAh) Ultra High Capacity, Replacement for Nikon EN-EL15 Battery : Electronics
Amazon.com: Accessory Kit Compatible with Synergy Digital, Works with Nikon D7100 Digital Camera includes: SDENEL15 Battery, SDM-1536 Charger : Electronics
Amazon.com : Wasabi Power Battery for Nikon EN-EL15 and Nikon 1 V1, D600, D610, D800, D800E, D810, D7000, D7100 : Digital Camera Batteries : Electronics
Amazon.com: Synergy Digital Camera Battery, Works with Nikon D7100 Digital Camera, (Li-Ion, 7.0V, 2100 mAh) Ultra Hi-Capacity, Compatible with Nikon EN-EL15 Battery : Electronics
Amazon.com : Nikon MB-D15 Grip Multi Battery Power Pack for D7200 and D7100 Digital SLR Cameras : Electronics
Amazon.com : Vello - BG-N11 Battery Grip for Nikon D7100 & D7200(6 Pack) : Electronics
Amazon.com : Battery Grip Kit for Nikon D800, D810 Digital SLR Camera Includes Qty 4 Replacement EN-EL15 Batteries + Vertical Battery Grip : Electronics
Amazon.com : Pixel MB-D14 Battery Grip for Nikon D600/D610 Camera Body Compatible with 1PC EN-EL15 or 6pcs AA/LR6 Battery (Battery Not Included) : Digital Camera Battery Grips : Electronics