TOKYO - Japan investigates the reason for the defect in Apple Inc.’s iPod after the emission of spark while recharging the digital music players, said a government official.

The reason for Japanese government conducting the investigation is to find out the cause why an Apple iPod nano gets overheated and emit sparks while being recharged.

An official at the trade and economy ministry, which administer the product problems, said a defect is suspected in the lithium-ion battery of the iPod Nano, model number MA099J/A.

The ministry has asked Apple Japan to investigate the cause of the incident. “It is suspected that the incident happened by the product itself,” said the official at the trade and economy ministry.

The problem was noted in January in Kanagawa Region, southwest of Tokyo, and Apple Japan reported this problem to the ministry in March. “No one was injured”, said the official.

Apple Japan refused to comment on the ministry’s statement. The iPod Nano players were sold in most of the countries, and it was not clear that where else beyond Japan the defect model iPod was sold, said Masayoshi Suzuki, the spokesperson of Apple, in Tokyo.

“An investigation has been launched. We will unveil all the information regarding the findings,” said the official. The incident surfaced on Tuesday when the government published a list of “serious accidents” assumed of being caused by consumer products.

The iPod Nano was assembled in China, but it was not specific that who manufactured the lithium-ion battery, said the ministry official. In 2006, Lithium-ion batteries have been held responsible for a series of blasts in laptops which have resulted in massive global recalls.

The Apple iPod has become a symbol of the fashion in recent years. But its sales momentum may be gradually declining. The lithium-ion batteries in Apple products have had some problems in the past, largely about the early exhaust and not about being prone to fires.

The lithium-ion battery is considered as a high-quality technology because of its ability to provide power especially in small size goods. Due to its suspected propensity to catch fire, most of the electronic companies and automakers are cautious in using it.

Lithium ion batteries, which Apple uses for its iPods, are common in consumer electronics, such as personal computers, mobile phones etc. In 2006, Sony was forced to recall millions of their lithium ion battery packs used with its own and other manufacturers’ computers due to fears they might catch fire.

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