Re: iOS 7 battery life iPhone 5
I am having the very same problem, when my battery reaches 35 to 33% my phone shuts off. When I plug it in it comes back on with around 38 to 40% charge remaining. I tried putting my phone in DFU and reinstalling iOS 7, hoping that would fix the problem. No luck! This is definitely an iOS 7 bug, with iOS 6 my phone was fine. I recently had a 2 1/2 hour flight, my phone was in airplane mode for the duration and was completely unused. At the beginning of the flight my phone had 70% battery remaining when I turned it on at the distant end it had 33% remaining. I sent one text message and then the phone shut off. Totally frustrating!
I have also noticed when I plug in my phone when the battery is beginning to get low for instance it is at 38%, as soon as I plug in the charger it will jump up to 52 or 54%. Clearly a battery level reporting bug in iOS 7!