A fuel cell system is described which comprises a power source and a fuel storage
unit. A flowable fuel is contained with the fuel storage unit. A first flow path
delivers fuel from the fuel storage unit to the power source. Some or all of this
fuel is deposited into the individual cell cavities within the power source. A
second flow path delivers fuel that is not deposited into the cell cavities to
the fuel storage unit. A third flow path delivers unused and/or partially used
fuel and/or reaction products and/or spent reaction solution from the cell cavities
back to an optional reaction product storage unit and/or the fuel storage unit
and/or to the second flow path. The system may further comprise an optional reaction
product storage unit, an optional regeneration unit, an optional second reactant
storage unit, an optional controller, and an optional power converter.
