Apple is offering free battery replacements for some iPhone 5 models sold between September 2012 and January 2013 that are experiencing poor battery life. Owners can check if their device is eligible by entering the serial number on Apple's website. Eligible phones can receive a free replacement battery at an Apple Store, Apple authorized service provider, or by sending it to Apple support. The replacement does not cover additional repairs for broken screens or cases. Customers are advised to back up their data before obtaining the free battery replacement.