In response to a number of issues regarding the battery in some of the first generation iPod nano units released in 2005, Apple has initiated a new global program for replacing the faulty units. Some units of the first generation iPod nano have been evaluated as having faulty batteries that can overheat. Apparently, the risk of overheating increases the older that the nano gets. The new iPod nano replacement program allows users to exchange their existing iPod nano for one that does not have a faulty battery and is described on the Apple website.
“Apple has determined that, in very rare cases, the battery in the iPod nano (1st generation) may overheat and pose a safety risk. Affected iPod nanos were sold between September 2005 and December 2006. This issue has been traced to a single battery supplier that produced batteries with a manufacturing defect. While the possibility of an incident is rare, the likelihood increases as the battery ages.
Apple recommends that you stop using your iPod nano (1st gen) and follow the process … to order a replacement unit, free of charge.
Note: This battery issue is specific to the iPod nano (1st gen) and does not affect any other iPod.”
The program only extends to a limited number of units of the iPod nano that have a battery sourced from a specific manufacturer. You will be able to identify if you own one of the faulty units by entering your device’s serial number on the online form that Apple asks you to submit. It is recommended that you cease using your first generation iPod nano until you can confirm that it is not affected or you receive a replacement unit.