I have had my 4S since launch and just the last month or so my battery life is on par with the droid x it replaced. I used to get through the day and have 25-30 percent left when I get off work at 6 or 7pm but now I am looking for a charger around 2 or 3. I restored the phone back to original settings through itunes and still no luck. Hoping someone has some insights on what to try.