After using my iPhone 4S for several days, my battery life has gone from horrid to decent. 1st Full Charge: Just under 2 hours usage, and around 10 hours standby. The phone was on all stock settings. 2nd Full Charge: After reading the battery life posts, and suggestions, i made a few tweaks from the stock settings. Little over 3 hours usage. 3rd Full Charge: Modified all settings that would save energy and weren't important to me... turned off most push settings, adjusted the screen brightness, turned off location services that weren't needed, and turned off wi-fi and bluetooth when not needed. Made a HUGE difference. I'm currently at 6 Hours 17 Min Usage, and 1 Day 4 hours standby... and still have 10% battery. Bottom line... like others, i initially thought that i must have a battery problem. I never would have imagined that changing the settings could result in such dramatic variance in battery life. I would have assumed 10% to 30% variance... not 300%. This makes me skeptical that there is a serious issue going around with battery problems. Rather, the initial settings just chew up battery life. And I have comfort that with iOS5 updates, things should only get better.