How Do Computer Clocks Work Without Power? Understanding RTC & CMOS Batteries
Discover how computer clocks keep time without power using CMOS batteries and Real-Time Clocks (RTC).
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Computer clocks often rely on a small battery, like a CMOS battery, to maintain time even when the main system is off. This battery powers the Real-Time Clock (RTC), ensuring your computer's date and time settings are retained. Regularly check and replace this battery to avoid timekeeping issues.
FAQs & Answers
- Why does my computer clock reset when it's turned off? Your computer clock resets due to the depletion of the CMOS battery, which keeps the Real-Time Clock functional when the system is powered down.
- How often should I replace my computer's CMOS battery? It's recommended to replace the CMOS battery every 3 to 5 years, or when you notice your clock losing time.
- What happens if the CMOS battery fails? If the CMOS battery fails, your computer may lose time settings, reset BIOS configurations, and you may encounter boot errors.
- Can I use my computer without a CMOS battery? You can operate your computer without a CMOS battery, but you will lose date and time settings each time the computer is turned off.