Hi, My new iPhone 5 is experiencing terrible battery life. Yesterday I went from 100% to 5% charge in a day - 2.5 usage (all wifi, one 5 min call, rest web browsing etc). 11 hours for standby. I've tried all the possible fixes suggested elsewhere - e.g factory reset, turn off uneccessary features etc. Still no improvement. The thing that makes me think I have a duff phone is that when I charge overnight (phone swicthed off), I never get to 100% charge - its usually at 40-60%. It's fine if I leave it switched on. Any thoughts?