after a year of having my RAZR, the battery quickly began to deteriorate. it wouldn't stayed charged for more than a few hours (shorter when i actually made calls). i was about to cancel my plan until a friend suggested buying a new battery. for the past 2wks, i've been so much happier! i can leave my phone on for days at a time, without having to turn it on/off to get power or keep it in the charger all day. definitely get this if you are having similar problems to what i was having....