Hi, I have a 32gb iphone 4s that has mediocre battery life (not sure if it is below the 50% threshold) and I want to use applecare (a year left) to get it replaced at the apple store (in the states). I charge it twice a day and constantly worry about the battery life. I turn off bluetooth, minimise notifications, minimise brightness, turned off push mail, fetch once an hour, and I try not to use the phone. The standby time is like 9 hours with reasonable use. Mostly texting and a couple apps. I don't play games. Some ipod. Other issues might be software. It does slow down and it has been crashing a fair bit. Nothing definitively wrong but I'd like a new one because the overall experience has degraded. Can anyone give any relevant experience? I know sometimes you get a nice apple employee or sometimes you can be a really assertive or pushy customer to get more than officially allowed.