If your heavy on the phone all the time get another battery period!!! I would say that with normal use as in just emails and a little web you will have 30-40% at the end of the day. Once you start making calls you can watch it go down and down and down. I mostly use email and web and maybe 3-4 5 minute calls and im at 40% at 9pm and starting my day at 9am. Its not the best its not the worst battery they have made. Also BB messenger and any other IM app will eat up battery fast. I hope they come out with an extended battery but I dont see that for a while. Make sure you drain your battery all the way down once and charge it over night after that keep topping it off as much as you can.