| 摘要 |
A battery device for an electronic apparatus includes a rechargeable secondary battery, a fuel cell, and a run time computing unit receiving, from the secondary battery, data representative of a voltage versus residual-capacity characteristic of the secondary battery, and receiving, from the fuel cell, data representative of a residual capacity of the fuel cell. The computing unit determines data representative of a residual capacity and a run time of the secondary battery in accordance with the data representative of the voltage versus residual-capacity characteristic and with supply voltage and supply current of the secondary battery, determines a run time of the fuel cell in accordance with the data representative of the fuel cell residual capacity and with supply current of the fuel cell, and estimates which of power capacities of the secondary battery and fuel cell reaches predetermined residual capacities earlier. If it is estimated that the power capacity of the fuel cell reaches its predetermined residual capacity earlier, the computing unit determines a run time of the battery device, in accordance with the data representative of the secondary battery residual capacity, the data representative of the fuel cell residual capacity, and the supply currents of the secondary battery and fuel cell. The computing unit supplies data representative of the thus determined run time of the battery device to a power management unit of the electronic apparatus. Thus the battery device including the fuel cell can be used with a conventional electronic apparatus.
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