Sometimes you have to go with the original
Crutchfield Customer Review (What's this?)
There are plenty of generic batteries out there and they are much cheaper, but none of them provide remaining battery life, which is essential if you're recording anything of importance. I've used some of the generic batteries and they work perfectly fine if you don't need the camera feedback on battery life, but for me it's worth the extra cost to have that. The biggest drawback is that these batteries do not have a very long recording time and Canon doesn't offer an extended battery for my video camera. You'll only get about an hour if you're recording at the maximum quality setting, which is the only reason I gave it a 4 instead of a 5. The good news is...You'll know when it's about to die.
Pros: Encoded to show remaining battery life down to the minute.
Cons: Doesn't have a very long recording time before it needs to be recharged.