Why Does a Computer Keep Time When Off? Understanding the CMOS Battery

Discover how your computer keeps time when it's off, thanks to the CMOS battery and its role in maintaining the real-time clock.

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Computers have a small battery called the CMOS battery that powers the system's real-time clock (RTC) even when the computer is turned off. This battery ensures the time and date settings are retained so they don't reset each time the system is powered on. Replacing the CMOS battery if it's failing can resolve any issues with time and date discrepancies.

FAQs & Answers

  1. What is a CMOS battery? The CMOS battery is a small battery on the motherboard that provides power to the real-time clock and maintains system settings when the computer is off.
  2. How do I know if my CMOS battery is failing? Signs of a failing CMOS battery include incorrect time and date settings, BIOS settings resetting, and error messages during startup.
  3. Can I replace the CMOS battery myself? Yes, replacing a CMOS battery is usually straightforward. Ensure you consult your computer's manual for instructions specific to your model.
  4. What happens if I don’t replace my CMOS battery? Failure to replace a CMOS battery may result in ongoing time and date discrepancies and potential issues with booting your computer.

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For more insights on computer components and maintenance, check our guides on recognizing hardware issues and optimizing system performance.

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