This is the 2nd replacment battery I've bought for my phone. The last one was totally fine and would get me thru a day no problem. This one lasts only about as long as my old one does now, about a half day, that I was going to replace. So now just using it as a backup battery for when the other one runs out of charge when I don't have anywhere to charge it. My phone is a few years old, so that is something to consider too.