Good news for you Iphone 5 users who are experiencing battery setbacks.
Apple has determined that a very small percentage of iPhone 5 devices may suddenly experience shorter battery life or need to be charged more frequently. The affected iPhone 5 devices were sold between September 2012 and January 2013 and fall within a limited serial number range.
If your iPhone 5 is experiencing these symptoms and meets the eligibility requirements noted below, Apple will replace your iPhone 5 battery, free of charge.
Go to this website and enter your serial number. https://ssl.apple.com/support/iphone5-battery/