NOVELTY - The method comprises receiving tube precursor material (502), forming a cathode tube from the tube precursor material (504), forming a hydrophobic layer adjacent to the inner surface of the tube (506), and forming a conductive layer adjacent to the outer surface of the tube. The tube precursor material includes a polymeric material, a catalytic material and a pore forming material. The cathode tube includes an outer surface and an inner surface configured to define a tube wall between the outer and inner surfaces. The formation of cathode tube step includes forming pores within the tube wall.    USE - The method is useful for forming a cathode tube of a rechargeable metal air battery using an apparatus (claimed), where the metal air battery includes zinc air batteries.    ADVANTAGE - The method is capable of economically forming the cathode tube of the rechargeable metal air battery with high efficiency and without damage.    DETAILED DESCRIPTION - The method comprises receiving tube precursor material (502), forming a cathode tube from the tube precursor material (504), forming a hydrophobic layer adjacent to the inner surface of the tube (506), and forming a conductive layer adjacent to the outer surface of the tube. The tube precursor material includes a polymeric material, a catalytic material and a pore forming material. The cathode tube includes an outer surface and an inner surface configured to define a tube wall between the outer and inner surfaces. The formation of cathode tube step includes forming pores within the tube wall, and extruding the tube precursor material through a die. The hydrophobic layer comprises an amorphous fluoropolymer. The formation of conductive layer step comprises seeding the outer surface with palladium, and electroless plating an outer surface with nickel and/or palladium. An INDEPENDENT CLAIM is included for an apparatus for forming a cathode tube of a rechargeable metal air battery.    DESCRIPTION OF DRAWING(S) - The figure shows a flow chart of a method of manufacture of metal air batteries.    Receiving tube precursor material (502)    Forming a cathode tube from the tube precursor material (504)    Forming a hydrophobic layer adjacent to the inner surface of the tube (506)    Arranging tubes in a cathode configuration (510)    Electrically connecting the tubes together. (512)