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 :

  A20 A21 A22 A30 A31  
 
  T20 T21 T22 T23 T30 T40 
  
  R30 R31 R32 R40 R50 R51 R52 
 
  X20 X21 X22 X23 X24 X30 X31 X32 X40 
 
  560 570 
 
  P/N: 02k6541

Package : 1 piece of CMOS battery