TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: In the oxidant reduction electrode module: the housing is of a singular molded construction, and configured so that only a single seal (being formed between the housing and the oxidant reduction electrode) is to be immersed into the ionically conductive medium; and the gaseous oxidant allowed into the gaseous oxidant receiving space via the gaseous oxidant inlet is pressurized to maintain a positive pressure in the gaseous oxidant receiving space. The oxidant reduction electrode: is sealed to the housing by a sealant that is impermeable to the ionically conductive medium; and comprises PTFE. The support members: are formed integral to the housing; and comprise baffles for the gaseous oxidant, where portions of the support members are spaced adjacent to one another and separated by a spacing defining a portion of the gaseous oxidant channel, and the spacing is 1-50 mm, preferably 10 mm. The oxidant reduction electrode module is installed into the electrochemical cell housing for an electrochemical cell comprising: the ionically conductive medium; and a fuel electrode comprising a metal fuel and positioned in the housing so that the metal fuel is exposed to the ionically conductive medium for electrochemically oxidizing the metal fuel, so that the oxidant reduction electrode is spaced from the fuel electrode, where the ionically conductive medium conducts ions between the fuel electrode and the ionically conductive medium facing side of the oxidant reduction electrode to support the electrochemical reactions at the fuel and oxidant reduction electrodes. The assembly further comprises: a cell cover containing a cell cover gaseous oxidant inlet configured to couple to the gaseous oxidant inlet of the oxidant reduction electrode module, so as to permit the flow of gaseous oxidant through the cell cover to the oxidant reduction electrode; a second oxidant reduction electrode module comprising an associated oxidant reduction electrode, where the second oxidant reduction electrode module is positioned opposite the oxidant reduction electrode module, the oxidant reduction electrode of the oxidant reduction electrode module faces the oxidant reduction electrode of the second oxidant reduction electrode module, and the fuel electrode is positioned between the oxidant reduction electrode of the oxidant reduction electrode module and the oxidant reduction electrode of the second oxidant reduction electrode module; and a second fuel electrode positioned between the oxidant reduction electrode of the oxidant reduction electrode module and the oxidant reduction electrode of the second oxidant reduction electrode module, where the fuel electrode is associated with the oxidant reduction electrode of the oxidant reduction electrode module, and the second fuel electrode is associated with the oxidant reduction electrode of the second oxidant reduction electrode module. The electrochemical cell system further comprises: a charging electrode comprising the oxidant reduction electrode, or a separate charging electrode spaced from the fuel and oxidant reduction electrodes of each electrochemical cell; and a gaseous oxidant pump configured to pump an amount of the gaseous oxidant into the gaseous oxidant channel. In the electrochemical cell system: each fuel electrode is configured to be mounted to an associated one of the oxidant reduction electrode modules, so that the fuel electrode and the associated oxidant reduction electrode module are jointly immersed in the ionically conductive medium; each fuel electrode and the charging electrode are configured (during re-charge) to reduce a reducible species of the metal fuel to electrodeposit the metal fuel on the fuel electrode, and to oxidize an oxidizable species of the oxidant by application of a re-charge potential difference from a power source; each fuel electrode comprises a series of permeable electrode bodies arranged in spaced apart relation, where (a) the spaced apart relation of the permeable electrode bodies enables the re-charge potential difference to be applied between the charging electrode and at least one of the permeable electrode bodies, (b) the charging electrode functions as the anode and the permeable electrode body functions as the cathode, so that the reducible fuel species are reduced and electrodeposited as the metal fuel in oxidizable form on the permeable electrode body, and (c) the electrodeposition causes growth of the metal fuel among the permeable electrode bodies so that the electrodeposited metal fuel establishes an electrical connection between the permeable electrode bodies; the oxidant reduction electrode modules comprise two oxidant reduction electrode modules configured to surround the fuel electrodes, where the two oxidant reduction electrode modules are positioned opposite each other, so that the oxidant reduction electrode of each of the oxidant reduction electrode modules faces one another, and surrounds the fuel electrodes; and the fuel electrodes comprise a single fuel electrode, common to each oxidant reduction electrode of the two oxidant reduction electrode modules.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The reducible species of the metal fuel comprises ions of zinc, iron, aluminum, magnesium or lithium. The metal fuel is zinc, iron, aluminum, magnesium or lithium. The ionically conductive medium is a liquid or comprises an aqueous electrolyte solution. The aqueous electrolyte solution comprises sulfuric acid, phosphoric acid, triflic acid, nitric acid, potassium hydroxide, sodium hydroxide, sodium chloride, potassium nitrate or lithium chloride.