Base on the press release by Apple, they admitted that a battery fault had led to a small number of its first generation iPod Nanos overheating. But the said problem was “rare”, occurring in 0.001% of devices sold between 2005 and 2006 adding there had been no serious injuries or damage.

This comment came after the Japanese government began investigating a possible battery defect in the Nano. There are two reports of the music players overheating in Tokyo, scorching nearby paper. Economy, Trade and Industry ministry official Hiroyuki Yoshitsune said the government was in touch with Apple to investigate the defect.

Apple said that the overheating problem, which could lead to the iPod failing to work and being damaged, could be traced to a single battery supplier. They also stated that any customer worried about their device, bought between September 2005 and December 2006, should contact customer services.
These Lithium-ion batteries, which are used in iPods, have been blamed for a series of fires in laptops, which resulted in global recalls. In fact last 2006 Apple was forced to recall some 1.8 million lithium-ion Sony-made laptop batteries that were prone to overheating.