Reactant supply and effluent storage cartridges adapted for use with a
closed liquid feed fuel cell system, as well as closed liquid feed fuel
cell systems. The cartridge includes at least first and second volumes
and comprises: a first reactant reservoir for holding a first reactant,
the first reactant reservoir being configured to occupy substantially all
of the first volume when filled with the first reactant; a second
reactant reservoir for holding a second reactant, the second reactant
reservoir being configured to occupy substantially all of the second
volume when filled with the second reactant; and an effluent reservoir
for holding effluent produced by the fuel cell system, the effluent
reservoir being configured to occupy, when filled with the effluent
produced by the fuel cell system, a portion of the first volume, a
portion of the second volume, or a portion of the first and second
volumes. The reactant supply cartridge of may further comprise an
electrolyte reservoir for holding an electrolyte. In other embodiments,
the present invention is directed to a computer system comprising the
detachable cartridges and closed liquid feed fuel cell systems disclosed
herein.