Instruct: Classify Amazon reviews into positive or negative sentiment
Query: New battery

I originally got this because the battery on my phone was dying only after a day or so and I'm glad I did. This battery works as well as the old one when it was brand new or even better. I was a bit worried that my RAZR would have been too old to have it fit since it was one of the first black models to go out, but it works perfectly fine with it.Now I'm not worried about my phone dying while over at a friend's house. The only reason it gets four stars is because it's just a battery and there's nothing else you can do with it.