A method of controlling an electric power source apparatus, which comprises supplying electric power to an electronic device on which a secondary battery is mounted from a power source apparatus having a fuel cell and an auxiliary power source. Electric power is supplied intermittently to a charging terminal of the electronic device by means of a switch for controlling conduction and interruption of an output terminal of the power source apparatus.

 
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< Electrode catalyst for fuel cell, electrode for fuel cell, and fuel cell

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> Portable fuel cell system with removable power adaptor

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