“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 noted below to order a replacement unit, free of charge.”
The 1st Generation iPod Nano can be identified by its White or Black plastic front, and silver metal back. You can check to see if your 1st Generation iPod is affected by the recall by visiting Apple.com and entering the Serial Number on the back of the iPod. Apple is replacing the affected units with a 1st Generation iPod Nano that does not have the defective battery.