| 摘要 |
A portable computer having a battery used as a main power source, a load which is variable, and a battery-voltage detecting circuit for detecting the output voltage of the battery. A plurality of predetermined voltage values is set in the battery-voltage detecting circuit. One of these voltage values is selected in accordance with the condition of the load, and is compared with the output voltage of the battery. It can therefore be accurately determined, regardless of the variation of the load, whether or not the power remaining in the battery is sufficient.
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