Question about Computers & Internet
Typically, the CMOS battery is a flat "coin-like" cylinder under a clip on the mother board. They can also be soldered in. Most often, these are either mercury or lithium batteries designed for very small current drain but a very long shelf life.
Their only purpose is to keep alive the BIOS settings when the power is off, and your PC will retain these settings without this battery as long as the power is on, even in stanby or as long as the main batteries are installed and not totally dead.
The CMOS keep alive batteries can be very pricey, special order critters, $30-$40 is not unusual.
To replace the battery:
1) Go into the BIOS, and record ALL the settings on paper.
2) Unsnap and replace the battery very quickly, hoping
that an internal capacitor will retain the settings just long
enough to do this = 1 or 2 seconds.
3) Check the BIOS settings again and fix them back to original
if need be.
4) IF the settings are lost, you may be able to use the
"Revert to factory defaults setting" feature in the BIOS.
5) if you loose the BIOS password and cannot get in:
a) Some PC's have a clear settings jumper on motherboard
b) Some PC's have a secret recovery password
Hope this helps
Posted on Apr 22, 2008
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Posted on Jan 02, 2017
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