This is the 3.6V 1/2 AA Lithium Battery 3.6 Volts - LS14250 Features: 1/2 AA size Lithium Thionyl Chloride Cylindrical Cell High energy, high reliability 3.6 volt power source Excellent memory backup power source Low self discharge rate gives this cell a 10 year shelf life Stable voltage and broad temperature range (-60 to +85) Designed for specialty and test equipment, this Saft brand battery packs 3.6 volts of lithium power into a 1/2AA cell. This Saft 1/2AA lithium battery is a high energy, highly reliable 3.6V power source.