Patent ID: 7955747

Claim:
An electronic device using a fuel cell as a power supply, comprising: voltage detection means for detecting the voltage generated by said fuel cell; residual fuel amount detection means for detecting the residual amount of fuel in said fuel cell; oxidizing agent concentration detection means for detecting the concentration of the oxidizing agent in said fuel cell; judgment means for judging the state of said fuel cell on the basis of the detection results of said voltage detection means, said residual fuel amount detection means and said oxidizing agent concentration detection means; and display means for displaying the state of said fuel cell judged by said judgment means, wherein if the judgment means judges that the voltage detected by the voltage detection means is greater than a specified voltage reference value, the display means displays that the state of the fuel cell is normal, wherein if the judgment means judges that the voltage is less than the specified voltage reference value, the judgment means further judges the residual amount of the fuel detected by the residual fuel detection means, wherein if the judgment means judges that the residual fuel amount is smaller than a specified fuel reference value, the display means displays that the residual fuel amount in the fuel cell is insufficient, and if the judgment means judges that the residual fuel amount is greater than the specified reference fuel value, the judgment means further judges the oxidizing agent concentration detected by the oxidizing agent concentration detection means, and wherein if the judgment means judges that the oxidizing agent concentration is less than a specified oxidizing agent concentration value, the display means displays that the oxidizing agent is insufficient, and if the judgment means judges that the oxidizing agent concentration is greater than the specified oxidizing agent concentration value, the display means displays that the state of the fuel cell is abnormal.