IBM Thinkpad X20 X21 Series RTC Battery (C-Moss Battery for real time clock) - 02K6715.

Note:This is Laptop's clock battery, not the main battery that powers a laptop.

Compatible Models:

Thinkpad X20,Thinkpad X21,Thinkpad X22,Thinkpad X23,

IBM part number 02K6715

Condition: New

Warranty= 90 days