Patent ID: 7947402

Claim:
A fuel cell system configured to receive a cartridge containing fuel, the fuel cell system comprising: a power unit comprising a fuel cell for producing power from the fuel supplied from the cartridge, the power unit being configured to receive start-up power from an electronic device which receives the power produced by the fuel cell; and a port configured to couple to the electronic device, wherein the port comprises: a first channel for receiving the start-up power from the electronic device and for supplying the produced power to the electronic device; a second channel for transmitting a signal indicating attachment of the fuel cell system to the electronic device to the electronic device when the fuel cell system is attached to the electronic device; and a third channel for grounding the electronic device, wherein the fuel cell system is configured to receive the start-up power from the electronic device via the first channel, and is configured to use the start-up power to supply the fuel and air to the fuel cell.