Patent ID: 7679334

Claim:
A power supply unit for supply of power to an electric apparatus, comprising an indicator unit, a power source containing a nonaqueous electrolyte secondary battery, an introduction-detecting unit for detecting introduction of the electric apparatus into vehicle for transportation of the electric apparatus, a voltage-detecting unit for detecting the voltage of the power source, a memory unit for storing a first voltage and a second voltage lower than the first voltage, a judgment unit for determining whether the voltage of the power source detected by the voltage-detecting unit is not lower than the first voltage, if the introduction of the electric apparatus into vehicle is detected previously by the introduction-detecting unit, and a forced discharge unit for causing the indicator unit to notify that the electric apparatus is in the state prohibiting introduction thereof into vehicle and forcibly discharging the power source until the voltage of the power source detected by the voltage-detecting unit reaches the second voltage by supplying power from the power source to the indicator unit, if the voltage of the power source is judged not lower than the first voltage by the judgment unit.