NOVELTY - A power tap device for use in a fuel cell stack having stackable items including separator plates and membrane electrode assemblies each having an anode and cathode, comprises: (i) first and second major outer surfaces that are electrically conductive; and (ii) a dielectric separating the first major surface from the second.    USE - For use in a fuel cell stack (claimed).    ADVANTAGE - The power tap device provides customers or users of fuel cell system with multiple supplies of smaller voltages than the combined voltage produced by a fuel cell stack.    DETAILED DESCRIPTION - A power tap device for use in a fuel cell stack having stackable items including separator plates and membrane electrode assemblies each having an anode and cathode and configured to be respectively stacked between pairs of separator plates, comprises first and second major outer surfaces (40, 42) that are electrically conductive; and a dielectric (44) separating the first major surface from the second. The power tap device is sized and is interposed between separator plates in the stack.    INDEPENDENT CLAIMS are also included for:    (a) a fuel cell stack, comprising first and second conductive plates; bipolar separator plates configured to be stacked between the end plates, having a depth and a height, respectively; membrane electrode assemblies each having an anode and a cathode and each is configured to be stacked between a pair of separator plates; and a power tap device as above, having a depth and height of a separator plate and is configured to be stacked between the end plates with the separator plates and membrane electrode assemblies, and including a passage to direct fuel from a separator plate on one side of the power tap device to a separator plate on the other side of the power tap device;    (b) a method of diving a fuel cell stack of the type configured to produce a voltage and including a stack of separator plates and membrane exchange assemblies each having an anode and cathode, into sub-sections providing lower voltages, comprising providing tap assemblies each including first and second major outer surface as above, and a dielectric as above; and introducing the power tap device into the stack; and    (c) a system, comprising a first power tap device as above; a second tap device as above; and an ultracapacitor electrically coupled between the first major surface of the first tap device and the second major surface of the additional tap device.    DESCRIPTION OF DRAWING(S) - The figure shows an isometric view of a power tap device included in a fuel cell stack.    First and second major outer surfaces (40, 42)    Dielectric (44)