After Replacement cmos battery R40

Good morning, i have i Thinkpad R40 to repair. He has a problem with date and time.
I replace the cmos battery with ref panasonic cr2032 lithium battery ibm p/n 02k6541 fru p/n 02k6572.
The battery is good, I replace the cmos battery but the problem is still the same.
The computer don't keep date and time.
Thankyou for help

richk read my mind, I know I've seen a post about exactly that point somewhere, but can't find it.
The correct FRU for the CMOS battery is 92P0991. If suspicions are correct the one you have fitted is for quite a lot of ThinkPad models, but the R40 had the same battery with reversed polarity.
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After Replacement cmos battery R40

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