Hi guys! Same sad story here. After upgrading to iOS 7 (from 6.1.3) iPhone 4s is draining the battery with a ridiculous rate of 1% every 1-2 mins. I've already tried to restore it and set up as a new phone, but with no luck. Even when the phone is switched off, battery drops a 1-2% (maybe this is due to the booting up). It's a tragedy, I mean... the battery sucked already before, but now... man, we need a socket everywhere we go if we want to use our iPhones seriously.
I'we read that this behaviour doesn't show on iPhone 5, many users are reporting a battery life improvements. So the thing is related to iPhone 4s and maybe to iPhone 4.
I've found so far this tricks to make the battery last more:
- switched off the background app auto refresh;
- switched off the GPS (disabling the many system services, like iAd, traffic, ect.);
- reduced the brightness and choosen a dark wallpaper;
- disabled notifications of apps I don't care of.
I hope Apple is reading this and taking care of many customers that want to enjoy the new OS, but at the same time are frustating of not using it completely because the battery doesn't last half a day.
Just to finish up this story, we can't downgrade our iPhone anymore since Apple blocked the restoring process yesterday... a fix must be released ASAP!