NOVELTY - The method involves connecting a metal air secondary battery i.e. zinc air secondary battery (10) with a hydroxide ion conductivity solid electrolyte body (14) i.e. layered double hydroxide dense body. An air electrode (12) i.e. positive electrode, is connected with a surface side of the hydroxide ion conductivity solid electrolyte body. A metal anode (16) is installed on another surface side of the hydroxide ion conductivity solid electrolyte body. Constant temperature in-air humidity is supplied to the air electrode. The metal anode is included with zinc or a zinc alloy.    USE - Method for using a metal air secondary battery e.g. zinc air secondary battery and lithium air secondary battery, of an electric vehicle. Can also be used as a large sized secondary battery, a small secondary battery, a coin-shaped zinc air secondary battery, a button-type zinc air secondary battery, a sheet-type zinc air secondary battery, a laminated-type zinc air secondary battery, a cylindrical zinc air secondary battery, a flat-type zinc air secondary battery, a square-shaped zinc air secondary battery, a coin-shaped lithium air secondary battery, a button-type lithium air secondary battery, a sheet-type lithium air secondary battery, a laminated-type lithium air secondary battery, a cylindrical lithium air secondary battery, a flat-type lithium air secondary battery and a square-shaped lithium air secondary battery.    ADVANTAGE - The method enables supplying constant temperature in air humidity to the air electrode, so that output characteristics of the metal air secondary battery can be ensured, reliability, service life and utilization rate of the metal air secondary battery can be improved and generation of dendrite in the metal air secondary battery can be suppressed.    DETAILED DESCRIPTION - The metal anode is included with lithium or a lithium alloy.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross sectional view of a zinc air secondary battery.    Zinc air secondary battery (10)    Air electrode (12)    Hydroxide ion conductivity solid electrolyte body (14)    Metal anode (16)    Negative electrode container (24)