Cause:
Like any battery the computer CMOS battery can fail or lose its charge.
Solution:
If your computer is losing its time or date settings�� or you are receiving a message CMOS Read Error�� CMOS checksum error�� or CMOS Battery Failure�� first try leaving the computer on for 24-hours. In some cases this can charge the battery and resolve your issue. This often resolves CMOS battery related issues when a computer has been left off for several months.
Compatible with the models :
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 T60
IBM ThinkPad R Series -- R40 R40e R50 R50e R50p R51 R52 R60
IBM ThinkPad X Series -- X30 X31 X32
IBM xSeries -- 300 400
P/N: 02K6541 02K7087 02K7075 08K8050
Package : 1 pcs of CMOS battery
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