A metal-air battery is disclosed. The battery includes a sodium anode and an air cathode. The battery further includes a solid electrolyte. The sodium anode may be a molten sodium anode, and the solid electrolyte may be a beta alumina solid electrolyte. The battery has an operating temperature between 100.degree. C. and 200.degree. C.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 The invention was made with Government support under Contract DE-AC05-76RLO1830, awarded by the U.S. Department of Energy. The Government has certain rights in the invention.