NOVELTY - Producing a metal air battery (400), comprises: forming a corrosion resistant coating on a surface of an anode core to form a composite anode (300), where the anode core comprises a first metal, and the corrosion resistant coating comprises a second metal that is different from the first metal; and storing an electrolyte in contact with the composite anode, where the electrolyte is configured to precipitate the corrosion resistant coating during electropolishing of the composite anode.    USE - The method is useful for producing metal air battery (claimed), which is useful in portable electronics (cell phones, portable computers, cameras and personal digital assistants), hearing aids, emergency back-up systems, mobile soldier applications, military applications and aerospace applications.    ADVANTAGE - The method provides the metal air battery, which: does not include a storage tank (capable of storing the electrolyte separate from the composite anode) and a pump system (capable of controlling the flow of the electrolyte to the composite anode) that increases the complexity of the battery and reduces the energy density of the battery; utilizes corrosion resistant coated anode core, hence does not exhibit corrosion during storage; exhibits long-life and increased internal resistance; and is prevented from collection of corrosion resistant coating on the cathode while electropolishing.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) operating the metal air battery, comprising: electropolishing the composite anode by removing at least a portion of the corrosion resistant coating to expose a surface of the anode core portion of the composite anode; precipitating the removed corrosion resistant coating out of an electrolyte that is in contact with the composite anode; and discharging the metal air battery via the exposed surface of the anode core;    (2) a metal air battery (I), comprising: the composite anode comprising the anode core and the corrosion resistant coating coupled to the surface of the anode core; a cathode (406) configured to discharge a positive charge from the metal air battery; a deplating electrode (502) configured to at least partially electropolish the corrosion resistant coating from the composite anode; a battery housing; and an electrolyte stored in the battery housing in contact with the cathode, the composite anode and the deplating electrode; and    (3) a metal air battery (II), comprising: the composite anode, where the corrosion resistant coating is capable of being at least partially electropolished from the composite anode via the cathode; the cathode configured to at least partially electropolish the corrosion resistant coating from the composite anode and configured to discharge a charge from the metal air battery; the battery housing; and the electrolyte stored in the battery housing in contact with the cathode and the composite anode.    DESCRIPTION OF DRAWING(S) - The figure shows a system including the metal air battery.    Composite anode (300)    Metal air battery (400)    Cathode (406)    Deplating electrode (502)    System (600)