| 摘要 |
A battery charger can avoid possibility of output shorting while the secondary battery is not connected and prevent use of a secondary battery other than dedicated one. The battery charger includes battery charging control means for supplying a charge current to a predetermined secondary battery via an output terminal, and output cut-off means for cutting off connection between the output terminal and the battery charging control means when the predetermined secondary battery is not loaded and for establishing connection between the output terminal and the battery charging control means when the predetermined secondary battery is loaded.
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