You should try turning your wifi off, and disable 3g
if you dont know how; just go to settings, general, then network. you'll see the option to disable Wifi if its enabled, as well as 3G. If you have 3G enabled, your iphone will die within 5 hours!! You can tell if your phone is on 3G mode by looking at the top left of it next to your signal bar, and see if there is an "E", a signal strength bar (Wifi), or an E, which is just the standard At&t network that takes less juice to run.
Try it lol
If your iphone is out of warranty you need to send it to apple to get the battery changed
http://www.apple.com/uk/support/iphone/service/battery/
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