Nikon MB-D14, Multi Battery Power Pack / Grip for D600 & D610 Digital Camera 27065
Pixel Battery grip D600
Digital Power Battery Grip for Nikon D600/D610 XBGND600
Vello BG-N10 Vertical Battery Grip for Nikon D600, D610 at KEH Camera
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
Amazon.com : Meike MK-D600 Vertical Battery Grip Compatible with Nikon D610 D600 DSLR Camera as MB-D14 : Electronics