The TL-5902 battery is 1/2 AA size and is 3.6 volt. It is a high energy lithium battery, often called a TL-5902, this battery is now also referred to as a SL750/S. The /S at the end of the part number simply denotes that the battery is a standard battery with no tags, pins or axial wires. This battery is ideal for standard and stand-by use. Capacity 1.1 Ah 1/2 AA Battery.

Series XTRA
Part Status Active
Battery Chemistry Lithium Thionyl Chloride
Battery Cell Size 1/2AA
Voltage - Rated 3.6V
Capacity 1.2Ah
Size / Dimension 0.57" Dia x 0.99" H (14.5mm x 25.2mm)
Termination Style Button Top (Extending)
Discharge Rate 500µA
Weight 9.2 g
Storage/Refrigeration Temperature 86°F (30°C) or Below