| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a secondary battery pack capable of easily recognizing a state of the secondary battery pack by a simple structure. Ž<P>SOLUTION: A thermo-reversible recording sheet material applied to a concealing label 3 serving as the outer package of a secondary battery pack is discolored during charging by a charger 2 and change its display by developing the color during the use of a digital camera 5. That is, in the charger 2, an "×" display 4 displayed on the thermo-reversible recording sheet material is erased in fully-charged time. Meanwhile, in the digital camera 5, the "×" display 4 is displayed on the thermo-reversible recording sheet material during detecting running out of battery power. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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