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NTT DoCoMo and Mitsubishi Electric Issue Advisory for D06 Batteries in D902i Handset


TOKYO, JAPAN, December 7, 2006 --- NTT DoCoMo, Inc. and its eight regional subsidiaries and Mitsubishi Electric Corporation announced today that some D06 series batteries manufactured through May 2006 and installed in DoCoMo FOMA™ D902i handsets could generate excessive heat and possibly rupture during charging if the batteries have been subjected to a strong external impact.

The problem is due to deformed electrode plates installed in the batteries. If the batteries are accidentally subjected to a strong external impact that results in a surface dent or similar depression, the deformed plates could pierce the batteries’ internal insulation, resulting in an electrical short during, or right after, charging.

The companies estimate that some 1.3 million D06 series batteries were manufactured through May 2006. The labels on these batteries bear one of the following clearly marked three-letter codes: OKA, OLA, PAA, PBA, PCA, PDA or PEA.

All D902i handsets owners will be directly mailed letters informing them that they will receive replacement batteries. Also, owners of D902iS and D903i handsets, which may possibly be equipped with the defective D06 batteries, will be directly mailed letters alerting them to check if their batteries bear any of the specified three-letter codes. Replacement batteries will then be sent to users accordingly.

Advisories will also be posted on the companies’ websites, DoCoMo’s i-mode™ portal site and in media advertisements.

For more information, users in Japan may call 0120-800-000 (toll-free) or 151 or 113 (from DoCoMo handsets) between 9 am and 8 pm (including Saturdays, Sundays and holidays) effective today.

To date, DoCoMo has confirmed that one D06 battery has ruptured due to the problem. In addition, 17 other cases of D06 battery rupture or overheating have been reported. So far, DoCoMo has confirmed that in a number of these cases, the malfunctioning batteries had been subjected to extremely strong impact. The other cases are still being investigated.

Sales of the D902i, D902iS and D903i have been suspended for the time being.

About NTT DoCoMo
NTT DoCoMo is the world’s leading mobile communications company. DoCoMo serves more than 52 million customers, including 30 million people subscribing to FOMA™, launched as the world’s first 3G mobile service based on W-CDMA in 2001. DoCoMo also offers a wide variety of leading-edge mobile multimedia services, including i-mode™, the world’s most popular mobile e-mail/Internet service, used by more than 47 million people. With the addition of credit-card and other e-wallet functions, DoCoMo mobile phones have become highly versatile tools for daily life. NTT DoCoMo is listed on the Tokyo (9437), London (NDCM) and New York (DCM) stock exchanges. For more, visit

About Mitsubishi Electric
With over 80 years of experience in providing reliable, high-quality products to both corporate clients and general consumers all over the world, Mitsubishi Electric Corporation (TSE:6503) is a recognized world leader in the manufacture, marketing and sales of electrical and electronic equipment used in information processing and communications, space development and satellite communications, consumer electronics, industrial technology, energy, transportation and building equipment. The company recorded consolidated group sales of 3,410 billion yen (US$ 31.9billion*) in the fiscal year ended March 31, 2005. For more information visit
*At an exchange rate of 107 yen to the US dollar, the rate given by the Tokyo Foreign Exchange Market on March 31, 2005.

i-mode and FOMA are trademarks or registered trademarks of NTT DoCoMo, Inc. in Japan and other countries.
NTT DoCoMo’s FOMA service is only available to subscribers in Japan.


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