Siemens 6ES79710BA00 Battery

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°C).,
• Voltage: 3.6 Volts
• Capacity: 2600mAh
• Chemistry: Lithium
• Dimensions: Diameter 0.56" x Height 1.97"
• Terminals: Button Top