CMOS Battery RTC (for the Real Time Clock)
Compatible With Following Machines:
Lenovo Thinkpad T440
Lenovo Thinkpad T440p
Lenovo Thinkpad T440s
Lenovo Thinkpad T460s
Lenovo Thinkpad T570
Lenovo Thinkpad L540
Lenovo Thinkpad L560
Lenovo Thinkpad L570
Lenovo Thinkpad S540
Lenovo Thinkpad S531
Lenovo Thinkpad P51s
Lenovo Yoga 15