The first few times I used my phone after charging this battery, I was extremely disappointed--it barely lasted a day. It eventually started to retain more charge over time, but the battery life is still below average compared to other phones I've owned. If your battery life is complete crap, and you're looking to improve it, this will probably help a little. I eventually just decided to scrap my RAZR and go with something else, which was a better move for me.