Are you sitting down? Good, because this may surprise you: Apple
just fessed up to there being a "small percentage" of iPhone 5
devices that may suddenly experience shorter battery life or need to be charged more frequently. It's not that often that Apple admits to defects -- Steve Jobs told users they were holding the iPhone 4 wrong when reports of poor antenna reception
emerged, and then Apple recycled the same excuse in response to the iPhone 5's camera flaw
. And the fact that it's overly prone to scratches and chips? That's normal
Ah, but we digress. The point here is that some iPhone 5 models have what Apple finally considers a legitimate problem, and that's the battery. It doesn't affect all handsets, just devices that were sold between September 2012 and January 2013 and that also fall within a specific (and limited) serial number range.
If your iPhone 5 seems to experience battery life woes, you can plug your serial number into Apple's iPhone 5 Battery Replacement Program
page to see if you own a defective model. If you do, Apple will replace the battery for you. For that to happen, you have to take the phone to an Apple Authorized Service Provider, Apple Retail Store, or contact Apple Technical Support.
Before taking your phone in for service, Apple asks that you back up your data to iTunes or iCloud, turn off Find my iPhone, and factory reset your device (erase data and settings in Settings > General > Reset > Erase all Content and Settings).