Im running a 2008 old ios backup that I've used throughout iphone 2G, 3G, 4 and now 5. And had problems
With my new iphone 5, got around 3,5-5h of use. And really(!) bad standby. I tried all battery tips and they did not reay improve that much at all. Maybe slightly but yet so little that I thought it also could be a placebo effect. But then I tried to turn on and off Safari iCloud in settings. Turn off iCloud for Safari and choose to delete info from this device. Then reboot phone and turn on iCloud for safari. I now get 1 day standby and 6,5-7h usage much depending on how much LTE. Try it out and let me hear what u think.