I got my new iPhone 7 Plus about two weeks ago and set it up as completely new. Yesterday afternoon i was checking the battery and it showed 9 hours of usage with 52% still remaining which already didnt seem reasonable. Anyway last night i charged it to 100% and left it unplugged overnight and it was down to 81% and the standby and usage time was the same ... about 6 hours this morning. i charged it again to 100% and now again it shows 30 mins of usage and standby even though i didnt even use it. Cant find any suspicious app activity either. Also push, most location services and background refresh are always deactivated. Any idea?