Saft LS173303PF 2/3 A Battery, 2/3 A, 3.6V, Lithium Thionyl Chloride. A 3.6V Primary Lithium Thionyl Chloride (Li-SOCl₂) from Saft. This battery is a non-standard sizes battery designed for reliability in specialist applications such as measuring devices, alarms and safety equipment, emergency transmitters, backup systems or real-time clocks. With an operating range from -60°C to 85°, C and resistance to wet environments are suitable to be used indoor and outdoor. They provide the high-performance and longer lasting life.