Saft Lithium Thionyl Chloride AA Batteries - Saft T04/8AA9, Non-rechargeable Lithium Thionyl Chloride 1/2 AA battery from Saft, suitable for PCB mounting.. For applications requesting good voltage response and operating life in - 60°C/+ 85°C environments these batteries are the ideal solution. These batteries are designed for low to medium current drain applications, and have the highest energy density of any lithium battery system. They offer a high operating voltage above 3.5V, high capacity for long discharge life, and very low internal self discharge resulting in high capacity retention even after extended storage periods e.g., in excess of 80% of retention after 10 years. Saft T04/8AA9 1/2 AA Lithium Tcl Battery