My battery life is miserable on my 4S with iOS 6. Went from 6 1/2 hour average usage to 5. I've had the since near launch so its since multiple OTA updates. I'm thinking maybe a fresh copy of iOS will help but I'm finding so much conflicting stuff. What I want to happen. Restore from new and not lose any of my contacts or pictures. I don't care about redownloading apps or losing app data. Can someone for certain tell me how to do that and/or point me in the right direction.