To perform appropriate monitoring of the residual quantity of a battery, corresponding to its maximum load without being affected by the type change in an electrical device, etc. when monitoring the residual quantity of a battery that supplies the electrical device with power, and to cope with the fault occurrence in the electric device, in a simpler configuration.
This battery residual quantity monitoring device A for a battery for electrical device is equipped with a voltage-measuring means 11 which measures the voltage of the battery from the start of operation of the electrical device to the finish of operation, a comparison means 12, which compares the measured voltage value with a first and a second thresholds (with second threshold
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