| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery pack or the like, in which the remaining capacity of a battery cell assembly can be checked even if a user does not perform any special operation after using a tool. SOLUTION: The battery pack includes a battery cell assembly 3 composed of a plurality of battery cells 13 to 36; a remaining capacity detection circuit 220 detecting the remaining capacity of the battery cell assembly 3; an indication lamp 150 indicating the remaining capacity of the battery cell assembly 3 based on detection results of the remaining capacity detection circuit 220; and a driving circuit 230 turning on the indication lamp 150 by operating the remaining capacity detection circuit 220 when the battery pack 1 is removed from an impact driver 100. COPYRIGHT: (C)2010,JPO&INPIT
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