Recently a laptop I have - Acer Travelmate 4000, started losing its date and time upon system startup. The initial boot screen displayed not only the ordinary information but the following error messages mentioned in the official documentation of the laptop:
CMOS checksum bad - Default configuration used Previous boot incomplete - Default configuration used
I disassembled the laptop and found that its RTC/CMOS battery is not an usual token battery, but one with connectors and cables.
After searching a bit, I've found that the battery is actually ML1220 battery. Looking at the specifications of this one and the most widespead one - the CR2032, both have equal voltages - 3V. They differ in the standard discharge current: ML1220 - 0.1 mA CR2032 - 0.2-0.3 mA (varies between manufacturers)
My question is: would it be a problem to disassemble the ML1220 and put a CR2032 between the cables? Would this difference in stadard discharge current have a negative effect onto the mainboard? I've found a replacement battery, but first it is pretty costly, next - no computer service in my region has it because the laptop is very old. So, I want to make the laptop use a more widespread battery and next time when it is needed to replace it, to look for the more widespread one and thus make the laptop more maintainable.
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Worked like a charm. Found 1220 battery but 2032 is better. There was even 2450, but it is not reasonable to be used for such application.