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."