| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a secondary battery pack, capable of surely displaying a charge state with a simple structure, using a magnetic display sheet without requiring user operation. Ž<P>SOLUTION: When the secondary battery pack 1 is mounted on a charger 2, a charge current flows to an inductor 26 through a current supply line 21. A magnetic display sheet 13 is colored by a magnetic field which is generated when the current flows to the inductor 26 in charging start, and makes the display change into a display state. The magnetic display sheet 13 in the display state keeps the display state, even in a state of being disconnected from the charger 2. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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