Canon 7d Battery.
If you want a cheaper alternative, look at sterling tek batteries. I purchased four of them and two went bad. Sterling Tek replaced them no questions asked. Here's an RMA and label. Send it back. Replacement in a week.
Excellent customer service, but 50% failure doesn't say much for their product.
Still, Sterling Tek batteries generally have a very good reputation.-- hide signature --
Unapologetic Canon Apologist
True, but I have bought two more for my T3i and they are doing just fine. i'm impressed with the no questions asked replacement. Just like Sandisk did with two of their CF's for me.