http://www.nikonchat.com/nikon-d7000-batteries/

Opteka Opteka Does the battery grip and Nikon D80 D7000 D90 with my work?
Any third party battery grip available, please let me know. Thanks Wil even work? i one already, needs the battery for a day of shooting.
The new D7000 uses a battery of new and more advanced so you want to buy a genuine nikon battery grip and batteries real-Ion Nikon. Generic batteries, chargers and battery grips can only lead to problems. They spent more than $ 1,100 for an excellent camera, NOW is not the time to go cheap. Save good money and buy what you need. Perhaps a second Nikon EN-EL15 battery and later the Nikon MB-D11 Battery Grip
nikon d7000 Battery Grip Unboxing