| 摘要 |
A power unit allows insertion of a cell therein, and supplies an electric power output from the inserted cell. A solar cell charges the cell inserted in the power unit. A CPU detects a voltage value of the cell inserted in the power unit, determines that the cell inserted into the power unit is a secondary cell when the detected voltage value is equal to or lower than a predetermined threshold value, and determines that the cell inserted into the power unit is a primary cell when the detected voltage value is larger than the predetermined threshold value.
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