As my iPhone 6 discharges, it seems to accelerate. I can get 2 hours out of 100-80%, but then I can only get 45 minutes from 80-70% at the very most. From there, it goes to about 30 minutes per 10%, and it makes my phone go from what looks like will be a 9-10 hour cycle to a 5 hour cycle. Any tips? I can't get my phone to last more than 5-5.5 hours at 15% brightness and all battery draining settings disabled. My iPad frequently gets 9-11 hour cycles, and the drain is very linear, doesn't seem to accelerate much as it discharges. My phone generates warmth just from Safari at 15% brightness while my iPad requires high brightness/games to do this. Any ideas? I've tried restoring and the phone always behaves the same. Can't find anything similar to this around the Internet either.