| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device in which high capacity, space saving, and long life are realized, the estimation of the life span is easy, and the estimated life span is not affected by the work of maintenance and inspection, and in which the battery replacement date can be displayed surely. SOLUTION: The battery ECU 7 estimates the life period during which a prescribed electric amount can be supplied from a date of manufacture of the battery packs 41, 42, and transmits the estimated life period to the MPU 10. The MPU adds the date of manufacture that is inputted from the input part 11 and stored inside and the life period transmitted from the battery ECU 7, and displays the next replacement date on the display part 12. COPYRIGHT: (C)2004,JPO
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