NOVELTY - A direct liquid feed fuel cell system comprises a housing having a cartridge inserting groove, a fuel cell including cathode and anode electrodes on an electrolyte membrane, a liquid fuel cartridge (120) inserted into the cartridge inserting groove to supply liquid fuel to the anode electrodes, and a fuel transport unit between the liquid fuel cartridge and the anode electrodes.    USE - Used in a mobile communication device, e.g. mobile phone.    ADVANTAGE - A liquid fuel supply to a fuel cell can be readily controlled. Mobile communication equipment can be operated for an extended time, and can be operated without the limitation of recharging a depleted battery power supply by replacing the fuel cartridge during the operation of the communication equipment.    DETAILED DESCRIPTION - A direct liquid feed fuel cell system comprises:    (1) a housing having a cartridge inserting groove and a first opening formed in a length direction of the cartridge inserting groove;    (2) a fuel cell within the housing and including cathode electrodes on an electrolyte membrane and anode electrodes on the electrolyte membrane opposite to the cathode electrodes;    (3) a liquid fuel cartridge that contains a liquid fuel, inserted into the cartridge inserting groove to supply the liquid fuel to the anode electrodes; and    (4) a fuel transport unit to transport the liquid fuel to the anode electrodes, where the fuel transport unit is located between the liquid fuel cartridge and the anode electrodes, and the liquid fuel is supplied to the fuel transport unit when the liquid fuel cartridge is rotated in a first direction to a first position, and the supply of the liquid fuel is disconnected when the liquid fuel cartridge is rotated in a direction opposite to the first direction.    An INDEPENDENT CLAIM is also included for a liquid fuel cartridge.    DESCRIPTION OF DRAWING(S) - The figure shows a perspective view of the direct liquid feed fuel cell system.    Liquid fuel cartridge (120)    External pocket (121)    Cap (124)    Holder spring (126)    Cover plate (128)