What is the purpose of a CMOS battery on a motherboard?

cmos slot   Dan cmos slot

Although ample storage is built-in, additional space can be added using the CFexpress Type B card slot CMOS sensor (according to a Hasselblad market survey

I tried putting a new cmos battery but it didn't fix the problem I'm not sure what's wrong Changing my laptop battery would 2 drive to a different slot & unplugging all drives but the windows disk all to no avail I'm totally stumped tbh Can anybody shed some light

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