NOVELTY - The recombinator (245) comprises a housing (250) defining a reaction chamber (255) for receiving a halogen source and a hydrogen source, and a catalyst within the reaction chamber to catalyze the formation of hydrogen halide from the halogen source and the hydrogen source. The halogen source, hydrogen source and hydrogen halide within the reaction chamber are in gaseous form. The halogen source is a bromine source. The catalyst is a precious metal or precious metal alloy, and is supported on a porous ceramic substrate.    USE - The recombinator is useful for a flowing electrolyte battery such as a zinc-bromine flowing electrolyte battery (claimed), zinc-chlorine battery and vanadium flow battery and for returning the gaseous molecular hydrogen back into the circulating electrolyte stream as hydrogen ions to prevent significant pH rises, where the battery is useful in power supply systems.    ADVANTAGE - The recombinator improves the operational life, performance and efficiency of the flowing electrolyte battery.    DETAILED DESCRIPTION - The recombinator (245) comprises a housing (250) defining a reaction chamber (255) for receiving a halogen source and a hydrogen source, and a catalyst within the reaction chamber to catalyze the formation of hydrogen halide from the halogen source and the hydrogen source. The halogen source, hydrogen source and hydrogen halide within the reaction chamber are in gaseous form. The halogen source is a bromine source. The catalyst is a precious metal or precious metal alloy, and is supported on a porous ceramic substrate, which is in thermal communication with a heating tube containing a heating element. The heating element enables the catalyst to attain a working temperature of 0-250 degrees C. A portion of the bromine source is produced by exposing a bromine containing electrolyte to a bromine evaporator. The bromine evaporator comprises an elongate tube with a hollow interior for passage of bromine vapor, apertures, and an open first end for passage of bromine vapor from the exterior into the interior of the bromine evaporator. The bromine evaporator is comprised of a material consisting of a ceramic, glass and a plastic, and partially enclosed by a mesh. The mesh is formed from porous ceramic, glass fibers, plastic fibers or sintered plastic beads or plastic beads encased within a glass fiber sock or ceramic sleeve. The bromine containing electrolyte is introduced onto the mesh enclosing the bromine evaporator and supplied via a bromine pump. The housing comprises a recombinator inlet (240) and a recombinator outlet (260). The recombinator inlet is in fluid communication with the hollow interior of the bromine evaporator, and the recombinator outlet is in fluid communication with a fluid channel, which returns electrolyte to a zinc electrolyte tank. A portion of the recombinator inlet is oriented to prevent the flow of liquid into and out of the reaction chamber, and extends in a direction parallel to the bromine evaporator elongate tube and in a direction at right angles to the direction of flow of reactants and products through the reaction chamber. A portion of the recombinator outlet is vertically elevated with respect to the reaction chamber. The bromine source and hydrogen source are drawn into the reaction chamber through the recombinator inlet, and the hydrogen halide is drawn out of the reaction chamber through the recombinator outlet due to a pressure differential generated by the flow of electrolyte past an open end of the recombinator outlet. The flow of electrolyte past the open end of the recombinator outlet is achieved by action of a zinc electrolyte pump. An INDEPENDENT CLAIM is included for a method of regulating the pH of an electrolyte stream within a flowing electrolyte battery.    DESCRIPTION OF DRAWING(S) - The diagram shows a sectional view of a recombinator.    Recombinator inlet (240)    Recombinator (245)    Housing (250)    Reaction chamber (255)    Recombinator outlet. (260)