A couple of things I have done that has improved battery life that I learned from my iPad. First go into settings, store, and sign out. Otherwise it does a lot on pinging. No sense being logged in if you don't use the store everyday. Need to check if there is an update for an app, or to get one, or to go into iTunes, just go back into store and log back on. Next, after I fully charged the first time, I did a reboot with power cord attached. Then I activated phone, and got an app called battery boost which fast charges, then trickle charges, and then does a top off charge. Seems to have made the battery drain better.