RS PRO, 6 V Lithium Thionyl Chloride Computer Backup Power Battery 1.5 Ah

Lithium TCL primary batteries optimised to give long life and to support real time clock and RAM functions of AT or compatible computers with 6V & 3.6/7V systems. The batteries contain internal resistors and anti-charge diodes.
This battery is non rechargeable

Underwriters Laboratories (UL) component recognition