Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Battery

I think these batteries are great. I use mine with my XTi with the grip, so you use 2 batteries at once, and I've shot 1,500 pictures in one day and never had to use a spare battery during that shoot. That's pretty awesome in my opinion. I don't know how many more I could have taken, that's just how many I shot in that one day.