CMOS Failure Symptoms:

Incorrect computer date and time settings. (This is the earliest sign that lets you know when the time is right to get a new CMOS battery.).
The computer occasionally turns off or refuses to start.
The laptop could not find a printer.
Malfunctioning of the mouse.
Problems launching a program.
Beeping sound from the computer.


Compatibility :

IBM Thinkpad 560 Series: 560, 560E, 560X, 560Z

IBM Thinkpad 570 Series: 570, 570E, 570X, 570Z

IBM ThinkPad A Series: A20, A20P, A20M, A21, A21E, A21M, A21P, A22, A22M, A22P, A23, A30, A30P, A31P

IBM ThinkPad T Series: T20, T21, T22, T23, T30, T40, T41, T42, T43, T60

IBM ThinkPad R Series: R40, R50, R50e, R50p, R51

IBM ThinkPad X Series: X30, X31, X32

IBM xSeries: 300, 400

Package : 1 piece of CMOS battery