Drastic reduction
iPhone 4S drains 10% per 30-35 minutes with little use. With normal use I typically need to add my mobi external battery late afternoon and that is fine to get me through the rest of the day. This is with moderate use of the phone, safari, and various apps. After installing iOS 6 starting with a full iPhone and mobi charge, I was completely dead in 8 hours with far less usage than normal. With the external battery I have never had to even think about running out of battery before. This was a dramatic noticeable change. Can I uninstall 6?