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As long as the voltage is between ~2.95V and ~3.3V, you're good to go.
If/when you replace it, check that there is no password set in BIOS (or that you know it)!
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From our empirical observations, it is when you fully discharge your main battery, and then let your computer sit there unused (and unplugged) for months at a time.
ie: computer uses the CMOS battery to maintain itself.
That's when your CMOS battery is in danger. Just our two cents.
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