Hey guys, Is anyone experiencing poor battery life on iPhone 4S? Since the update to iOS7, my iPhone 4S' battery life has been upside down. It's not even calibrated IMO. I tried to calibrate it (drained the battery completely, left overnight and charged it the next day for over 1 hour even after it was fully charged) once but it looks like it failed. Nothing has changed. It's been quite an issue as I can't even tell for sure how much time is left until the battery is out of juice. I'm seriously thinking about a restore (including a backup of course) but i don't want to lose any of my data (game progress etc..) Any advice will be much appreciated. Thank you!