TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Method: The method further comprises generating electrical current using the electrochemical cell by oxidizing the metal fuel at the first electrode functioning as an anode and reducing an oxidizer at the second electrode functioning as a cathode, where electrons are generated for conduction from the first electrode to the second electrode via a load, and the oxidized metal fuel ions and reduced oxidizer ions react to form a by-product. In the method, the recharging is performed at 20-60 degrees C. In the method, during charging the electrochemical cell: the electrochemical current is applied between the charging electrode and at least one of the permeable electrode body with the charging electrode functioning as the anode and the at least one permeable electrode body functioning as the cathode, such that the reducible metal fuel ions are reduced and electrodeposited as metal fuel in oxidizable form on the at least one permeable electrode body; and the electrodeposition causing growth among the permeable electrode bodies such that the electrodeposited metal fuel establishes an electrical connection between the permeable electrode bodies. In the ionically conductive medium, the poly(ethylene glycol)tetrahydrofurfuryl is for: enhancing reduction of reducible metal fuel ions for electrodeposition as a metal fuel on a fuel electrode having a cathodic potential during the electrodeposition; or delaying passivation of the metal fuel during oxidation with the fuel electrode having an anodic potential.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The ionically conductive medium is an aqueous electrolyte solution. The aqueous electrolyte solution is alkaline. The aqueous electrolyte solution comprises potassium hydroxide. The metal fuel is zinc and the reducible metal fuel ions are reducible zinc ions.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The charging electrode is: the second electrode; a third electrode spaced from both the first and second electrodes; or at least one body of the first electrode where the first electrode comprises many spaced apart permeable bodies for receiving the metal fuel. The first electrode comprises a series of permeable bodies arranged in spaced apart relation. The second electrode is an air electrode for absorbing and reducing oxygen during discharging. In the electrochemical cell, the first electrode comprises a series of permeable bodies arranged in spaced apart relation, where the spaced apart relation of the permeable electrode bodies enables the electrical current to be applied between the charging electrode and at least one of the permeable electrode body with the charging electrode functioning as the anode and the at least permeable electrode body functioning as the cathode, such that the reducible fuel ions are reduced and electrodeposited as fuel in oxidizable from on the at least one permeable electrode body, where the electrodeposition causes growth of the fuel among the permeable electrode bodies such that the electrodeposited fuel establishes an electrical connection between the permeable electrode bodies.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The poly(ethylene glycol)tetrahydrofurfuryl is in a concentration of 0.5-4 ml/l. The poly(ethylene glycol)tetrahydrofurfuryl has 2-5 ethylene oxide units.