The company has just announced a battery replacement program for some iPhone 5 phones sold between September 2012 and January 2013, whereby these devices may experience " reduced battery life." suddenly or you have to charge more often ".
To know if your device is in replacement, you can click on this link , then enter the serial number of iPhone 5. If you ever have to replace the battery for the machine, contact the service center. Apple authorized operator nearest you to see if you get a refund of 79 USD. Currently the program has started to start in the US and China, other countries will be applied from August 29.
To view iPhone series numbers: few Settings > General settings > About > Serial Number