A portable fuel cell power source including a fuel reservoir for storage of fuel which is provided to one or more fuel cells for generating electricity. The fuel supply is controlled by a fuel supply on-off switch. The electricity produced may be optionally modulated by power conditioning electronics before being supplied to an extrinsic device through an electrical connector. The electrical connector may be of a standard or universal type that is found in or may be incorporated into many different types of portable electronic devices. Fuel is supplied to the fuel reservoir via a refueling port which is adapted to be connected to different extrinsic refueling sources, including both stationary and portable refueling sources.