I have been using a 4S since launch. I am usually the first to complain about the battery life. It has been awful for me, no matter what I do. On a typical day I would be down to 10% by about 6pm. I usually keep a charger handy, but with the 4S it's been more of a necessity to have a charger or a mophie. But the past two weeks, all of a sudden, my battery life is awesome. I can't explain it. I have not done anything to modify the phone, no restores, no updates, I haven't even messed with my apps. My usage has not changed at all, I tend to use my phone a lot for web browsing and facebook, etc while I'm at work. I took my phone off the charger yesterday around 10am. I haven't charged it since (now about 37 hours) and I still have 30% of my battery. And the icing on the cake is my phone is and has been jailbroken for several months now, which usually would have the opposite effect if anything. I'm not complaining, but I am a little confused. Mostly I am just curious if this kind of drastic fluctuation has been experienced by anyone else?