NOVELTY - A rechargeable zinc-air flow battery (1) has tank(s) (2) for containing an aqueous solution (3) of zinc oxide in alkaline metal hydroxide, a battery stack (6) in fluid communication with the tank, and a mechanism (C) for allowing the circulation of the aqueous solution through the battery stack and the tank. The component (6) has a zinc electrode (8) comprising a carbon composite-containing support and metallic zinc electrodeposited on the surface of the support, a cavity (9) adapted to house the aqueous solution, bifunctional air electrode (10), and separator (13).    USE - Rechargeable zinc-air flow battery. Uses include but are not limited to smart grid, energy storage for use in combination with renewable energy resources e.g. wind and solar power, backup power, and residential power.    ADVANTAGE - The economical rechargeable zinc-air flow battery has excellent cycle characteristics, energy density and durability. The internal short circuit and dendrite formation in anode are prevented. The battery, when integrated in the device and/or system, improves efficiency of device and/or systems.    DETAILED DESCRIPTION - A rechargeable zinc-air flow battery has tank(s) for containing an aqueous solution of zinc oxide in alkaline metal hydroxide, a battery stack in fluid communication with the tank, and a mechanism (C) for allowing the circulation of the aqueous solution through the battery stack and the tank. The tank has inlet (4) and/or outlet (5) for allowing circulation of the aqueous solution through the tank. The component (6) has a zinc electrode comprising a carbon composite-comprising support and metallic zinc electrodeposited on the surface of the support, a cavity adapted to house the aqueous solution, a bifunctional air electrode comprising an oxygen reduction layer (11), an oxygen evolution layer (12) and optionally a gas diffusion layer, and a separator provided between the air electrode and the zinc electrode and located within the cavity adapted to house the aqueous solution. The cavity is provided with an inlet (15) and an outlet (16) to allow continuous circulation of the aqueous solution through the cavity. The oxygen reduction layer and the oxygen evolution layer comprise a nickel-based support.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of rechargeable zinc-air flow battery.    Rechargeable zinc-air flow battery (1)    Tank (2)    Aqueous solution (3)    Inlets (4,15)    Outlets (5,16)    Battery stack (6)    Zinc electrode (8)    Cavity (9)    Air electrode (10)    Oxygen reduction layer (11)    Oxygen evolution layer (12)    Separator (13)