NOVELTY - Fuel cell system (2) comprises electrical energy storage device (16) for providing electrical potential across first catalytic electrode (21), first electrode-electrolyte assembly (4), and second catalytic electrode (22), and having positive and negative terminals in electrically conductive communication with first and second catalytic electrodes, respectively, for providing process energy for hydrogen formation reaction and removing poisons from first catalytic electrode, and for causing hydrogen to diffuse through first electrode-electrolyte assembly to third catalytic electrode.    USE - Used as fuel cell system.    ADVANTAGE - Fuel cell system is capable of processing organic fuels at ambient temperature (60-100 or up to 180degreesF) and generating an electrical energy output. Transient load following capability of the fuel cell system is enabled, because ramp-up time associated with heating the fuel cell and/or fuel processing system are eliminated.    DETAILED DESCRIPTION - Fuel cell system comprises:    (a) a first electrode-electrolyte assembly having a first catalytic electrode coupled to one side of the first electrode-electrolyte assembly, and a second catalytic electrode coupled to an opposite side of the first electrode-electrolyte assembly;    (b) a first conduit in fluid communication with the first catalytic electrode for delivering fuel to the first catalytic electrode at ambient temperature;    (c) a second electrode-electrolyte assembly (6) having a third catalytic electrode coupled to one side of the second electrode-electrolyte assembly, and a fourth catalytic electrode coupled to an opposite side of the second electrode-electrolyte assembly;    (d) an electrically conductive mesh (8) having apertures extending through it, and positioned between and in sealing engagement with the second catalytic electrode and the third catalytic electrode, such that portions of the second and third catalytic electrodes engage each other in the apertures;    (e) a second conduit in fluid communication with the fourth catalytic electrode for delivering oxidant;    (f) electrical potential provision mechanism for providing an electrical potential across the first catalytic electrode, the first electrode-electrolyte assembly, and the second catalytic electrode; and    (g) an electrical load circuit for using an energy output generated across the third catalytic electrode, the second electrode-electrolyte assembly, and the fourth catalytic electrode.    The electrical potential provision mechanism comprises electrical energy storage device, a battery, and/or a capacitor. The process energy is less than the energy output and during operation of the fuel cell, a portion of the energy output replenishes the electrical potential provision mechanism. INDEPENDENT CLAIMS are included for:    (1) a method of operating a fuel cell system; and    (2) a method of selecting a fuel for a fuel cell system.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the fuel cell system.    Fuel cell system (2)    First electrode-electrolyte assembly (4)    Second electrode-electrolyte assembly (6)    Electrically conductive mesh (8)    Electrical energy storage device (16)    First catalytic electrode (21)    Second catalytic electrode (22)