Patent ID: 7901833

Claim:
A fuel cell power system comprising: a fuel cartridge; and a fuel cell; wherein the fuel cartridge comprises: a container for containing methanol solution fuel of a predetermined concentration; a connector having a predetermined shape provided at an outer face of the container for coupling the fuel cartridge to the fuel cell; a positioning member provided at an outer face of the container on or near the connector for determining a rotational position of the fuel cartridge with respect to the fuel cell at a time of mounting the fuel cartridge on the fuel cell; and a concentration distinguishing member for distinguishing a methanol concentration of the methanol solution fuel, the concentration distinguishing member being provided at the outer face of the container on or near the connector; and wherein the fuel cell comprises: a coupler having a shape configured to receive the connector of the fuel cartridge; a position determining member for recognizing a position of the positioning member and determining the rotational position of the fuel cartridge; and a concentration judging member for determining whether a fuel is acceptable if the concentration distinguishing member provided on a container of a first fuel cartridge is aligned with the concentration judging member or is not acceptable if the concentration distinguishing member provided on a container of a second fuel cartridge having a connector of the same shape as the first fuel cartridge but having a different methanol solution fuel concentration is not aligned with the concentration judging member.