The tale of my iPhone 5 battery...
When it came time to upgrade my old iPhone 3GS a couple of years ago, I wavered between the new iPhone 5 and some flavor of Android phone. For a variety of reasons, not all very well thought out, I ended up with the iPhone 5. I had an iPad, and a small investment in apps, so it seemed the way to go. About 9 months ago, around the time of one of the iOS 7 updates, I found my phone would often (as in "constantly") turn itself off and show it needed to be charged when the meter showed about 30% charge remaining. A quick Google showed I was not alone in this annoying behavior. I'd plug the phone in to charge it and it would instantly show as having 35%+ charge remaining. Sometimes doing a hard reset by pressing and holding both the Sleep and Home button would temporarily remind my phone it did indeed have juice, but not always. "Miscalibration," was the term I saw bandied about. I tried backing up my phone and restoring it. No dice. This got worse and worse...