TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The fuel cell is configured to be disconnected from a fuel delivery system during at least a portion of the service life. The casing is configured to be liquid-tight regardless of orientation. The first chamber is filled at least partially with a liquid fuel and the second chamber is filled at least partially with a liquid electrolyte. The cathode comprises an air-breathing cathode. The anode comprises a metal capable of catalyzing an electrochemical oxidation of the liquid fuel. The fuel cell lacks a membrane. The first chamber is configured to retain 2000 ml of liquid fuel. The second chamber is configured to retain up to 1000 ml of liquid electrolyte. The casing has a rectangular outer shape. A largest outer dimension of the casing is at most 50 cm. The fuel cell comprises a free inner volume of 4000 (preferably 1.5-3000) ml. The casing comprises sealable opening(s) communicating with each chamber. The casing comprises ports configured for multiple opening and resealing operations. It also comprises valves. The fuel cell further comprises an ancillary power supply device, preferably a supercapacitor, for peak power requirements.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Materials: The liquid fuel may comprise a lower alcohol, trimethyl ammonium borohydride ((CH3)3NHBH3), sodium carboxylate (NaCOOH), or potassium carboxylate (KCOOH).    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Materials: The liquid fuel may comprise lithium aluminum hydride (LiAlH4), potassium borohydride (KBH4), sodium borohydride (NaBH4), lithium borohydride (LiBH4), sodium aluminum hydride (NaAlH4), sodium cyanoborohydride (NaCNBH3), calcium hydride (CaH2), lithium hydride (LiH), sodium hydride (NaH), potassium hydride (KH), sodium thiosulfate (Na2S2O3), sodium hypophosphite (NaH2PO2), potassium thiosulfate (K2S2O3), potassium hydrogen phosphite (K2HPO3), or potassium hypophosphite (KH2PO2). The liquid electrolyte comprises an aqueous inorganic hydroxide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Materials: At least a portion of the casing comprises a plastic material, preferably polyolefin, polycarbonate, polyvinyl chloride, acrylonitrile-butadiene-styrene terpolymer, polyurethane, polytetrafluoroethylene, or silicone rubber.    TECHNOLOGY FOCUS - METALLURGY - Preferred Materials: At least a portion of the casing comprises metal or a metal alloy, preferably stainless steel, nickel, chromium, or titanium.