1/2 AA size Lithium Thionyl Chloride Cylindrical CellHigh 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). Brand: Saft Type: Lithium Voltage: 3.6 Capacity: 1200 mAh Color: White Green Size: 0.56" diameter x 1.00" long Contacts: Button Type Warranty: DOA ER14250: 3.6 volt primary Lithium Battery. Dimensions: 24mm x 14.5mm. Replaces TL5802, TL-5902, TLL5902, TLL-5902, 14250, CR14250, ER14250, LS14250, TL-5151, TL-2150, T-04/51. This is a non-rechargeable battery. Battery dimensions: 15/16" long (24mm), 9/16" diameter (14mm). Solder tabs available for $ 2.90 extra per cell (one tab is spot-welded to top of cell, and 1 tab is spot-welded to bottom of cell. This enables mounting to PCB or for connecting wires to battery.