... , Xeno XL-200F, XL-205F, Minamoto ER34615, ER20, ER32L615 etc.Lithium manganese dioxide batteries:1/2AA, 2/3AA, AAA, AA,A, 2/3A ... power source for gas meters and water meters.Lithium Thionyl Chloride and lithium manganese dioxide batteries has the highest energy density of any practical ...