Xeno Line (XL-050FAX W/Leads) 1/2AA w/Leads 3.6Volt Lithium Thionyl Chloride Battery Dimensions: Diameter: 14.5 mm. Height: 25.2 mm.
Replace Tadiran batteries:
TL-2150, TL-4902, TL-5101, TL-5151, TL-5902, SAFT Batteries LS-14250, LS-14250C.