clock - Why do PCs still require a CMOS battery? - Super User
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CMOS Battery – Everything You Need to Know, and How to Replace It; – DESKDECODE.COM
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How to change the BIOS/CMOS battery
How to change the BIOS/CMOS battery
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identification - CMOS coin battery drained out in 5min even without the BIOS IC - Electrical Engineering Stack Exchange
