NOVELTY - Making microfabricated fuel cell integrated into printed circuit board (PCB), involves depositing cathode current collector(s) (210) on the PCB substrate; creating air hole(s) (205) through the PCB substrate; patterning sacrificial polymer on cathode current collector; depositing proton exchange membrane (260) on cathode catalyst; removing sacrificial polymer layer from between the cathode catalyst and the cathode current collector; depositing anode catalyst(s) (270) on the proton exchange membrane; and providing fuel for oxidation at the anode catalyst.    USE - The method is used for making a microfabricated fuel cell integrated into PCB for electronic device. The fuel cell includes inorganic or organic fuel cell, direct methanol fuel cell (DMFC), reformed methanol fuel cell, direct ethanol fuel cell, polymer electrolyte membrane fuel cell (PEMFC), microbial fuel cell, reversible fuel cell, or formic acid fuel cell. The integrated microfabricated fuel cell may be used for electronic battery replacement, mini and microelectronics, car engines, and power plants.    ADVANTAGE - The integrated microfabricated fuel cell can produce significant amounts of electrical power which can be used by the electronic components within and on the PCB. The fuel cell has a high open circuit potential of approximately 0.6 V.    DETAILED DESCRIPTION - Making a microfabricated fuel cell integrated into printed circuit board (PCB), involves depositing cathode current collector(s) (210) on the PCB substrate; and creating air hole(s) (205) through the PCB substrate. A sacrificial polymer is deposited over the cathode current collector, and patterned to expose regions of the underlying cathode current collector. Cathode catalyst(s) is deposited over the sacrificial polymer. A proton exchange membrane (260) is deposited on the cathode catalyst. The sacrificial polymer layer is removed from between the cathode catalyst and the cathode current collector. Anode catalyst(s) (270) is deposited on the proton exchange membrane, and a fuel for oxidation is provided at the anode catalyst. INDEPENDENT CLAIMS are included for:    (1) microfabricated fuel cell integrated into a printed circuit board comprising at least one anode, at least one cathode, at least one proton exchange membrane, and a fuel cell reservoir (290); and    (2) electronic device comprising the microfabricated fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic diagram of a step the fabrication of an integrated microfabricated fuel cell.    Air hole (205)    Cathode current collector (210)    Proton exchange membrane (260)    Anode catalyst (270)    Fuel cell reservoir (290)