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CMOS battery

   Also found in: Wikipedia 0.04 sec.

A battery that maintains the time, date, hard disk and other configuration settings in the CMOS memory. CMOS batteries are small and are attached directly to the motherboard. See BIOS setup and batteries.


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This lets you confirm the batten problem and gives your repairman access to the CMOS battery settings without the guesswork of using the key sequence.
Sooner or later, when ``CMOS Checksum Error -- Run Setup'' appears on the screen, you can bet that your CMOS battery just died.
 
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