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Coffee Break DIY: 4.5V Battery Replacement for Old CMOS Batteries – Matt's Repository
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How to replace Computer Clock battery? - Hardware - AtariAge Forums
How is the CMOS battery related to the date on your PC? - Quora
Why does my laptop ask me to manually set the time and date every time I open it? - Quora
3 Ways to Maintain a Battery Powered Quartz Wall Clock - wikiHow