Ntt Docomo, Inc.

Mitsumi Electric Company Ltd.

Keiichi Kitamura

Yoshihide Majima

Kazuhiko Takeno

Yasuyuki Kanai

Haruo Uemura

A battery condition detector configured to detect a micro short circuit of a rechargeable battery is disclosed. The battery condition detector includes a processing part configured to calculate the remaining capacity and the full-charge capacity of a rechargeable batteryand to determine the micro short circuit of the rechargeable batteryby detecting an overcharge of the rechargeable batterybased on a charged capacity charged during the charging of the rechargeable battery, the remaining capacity calculated at a calculation time immediately before the start of the charging, and the full-charge capacity calculated before the start of the charging; and a communications partconfigured to output a signal according to the determination result of the processing part

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Tokyo, Japan

Keiichi Kitamura