Have had this problem out of the box. Battery seems to be lasting very well, but when it gets to around 46%, it shuts off. Then when I plug it in, it shows the connect to charger screen, then turns on and starts charging back up from 46%. I've tried fully depleting and charging, and even tried doing a restore, but no luck. Any suggestions?
iPhone 5, iOS 6
These are features of faulty battery. Either return iPhone to the place where you bought it or make Genius reservation and take to Apple for resolution under Warranty.
I just started having the same problem in the past two weeks and today my iPhone 5 purchased in June 2013 shut off with 50% battery and when plugged in immediately showed no battery left and took 5 minutes before it came on. This happened when shooting video twice in a row. Battery showed 50% and as soon as I pressed the video button the phone turned off.
I called Apple Support and convinced them to give me a replacement iPhone5. They were willing to do so because I have an Apple Care Plus plan in place on my iPhone5. The battery on the new replacement iPhone5 lasts a lot longer. Plus I have implemented some of the things that Apple recommends on it's iPhone Battery page, and now my new replacement iPhone5 lasts all day and evening on a single charge. I turned off location services for everything except Find My Phone and Camera. I turn it on selectively for other apps and turn it off when I am finished using that app. I also turned off Alerts for everything except Calendar, Phone and Reminders. And I turned off Badge App Icons for everything except Messages and App Store. And I turned my screen brightness down to 75% of max. I did not implement the rest of Apple's battery saving recommendations because to do so would essentially make your iPhone5 not useable for much of anything. Those three changes, plus a new replacement iPhone5, solved the problem for me.
Here is a link to the Battery info provided by Apple:
iPhone 5 shuts off once it gets to about the 50% battery level.
