Nikon Multi Battery Power Pack for Nikon D610 and D600 Digital SLR - Walmart.com
Amazon.com : Rechargeable Li-ion Battery for Nikon EN-EL15 and Nikon D600, D610, D800, D800E, D7000, D7100 Digital SLR Camera and Nikon 1 V1 Digital Camera : Electronics
Nikon D610, Battery Grip, WU-1B WiFi dongle: For Sale and Wanted Forum: Digital Photography Review
Amazon.com : Battery Grip Kit for Nikon D600 D610 Digital SLR Camera Includes Qty 2 Replacement EN-EL15 Batteries + Vertical Battery Grip : Digital Camera Accessory Kits : Electronics