I got my Seidio 3500 battery Saturday. Charged it up Saturday night, got up Sunday and it was snowing. Was a good day to TEST this battery. I was on this phone, a couple of phone calls, a couple of texts, about two dozen emails, and web surfing. This phone was on for ten straight hours, the screen on the whole time, all that I have disabled is WiFi and Bluetooth everything else is going. Ten hours straight before the low battery warning came on. Under normal use I should get two days out of it. It adds a little more bulk to the phone but I had a hard time holding it before, it feels better to me now, a lot easier to hold. Well worth the $70.00 imho.