6 Signs show you the BIOS (CMOS) Battery is running low

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The BIOS (Basic Input/Output System) battery, also known as the CMOS battery, is a small coin-cell battery on your motherboard that powers the BIOS chip, ensuring it retains important system settings, like the time, date, and hardware configurations, even when your computer is powered off. Over time, this battery can lose its charge, causing issues with your computer. Here's how you can tell if it's time to replace it.

1. Time and Date Keep Resetting

One of the clearest signs is that your computer's clock and calendar reset every time you turn it off and back on. You might see an incorrect date or time, often years in the past, which is a strong indication that the BIOS battery is failing.

2. BIOS Settings Don't Save

If you notice that custom settings in your BIOS, such as boot order or overclocking preferences, are being reset to default values after a restart, it's likely because the battery no longer has enough power to preserve them.

3. Error Messages During Boot

When the BIOS battery is dying, you might encounter error messages like:

• "CMOS Checksum Error"
• "BIOS Settings Reset to Default"
• "System Battery Voltage Low"

These warnings usually appear on the startup screen before the operating system loads.

4. System Slows Down or Boot Fails

A failing BIOS battery can sometimes cause unpredictable issues, such as:

• Longer boot times
• System freezes or crashes during startup
• Inability to boot entirely

5. Hardware Detection Problems

The BIOS battery helps the motherboard remember connected hardware. If your computer struggles to recognize devices like your hard drive, keyboard, or mouse, the battery might be running out.

6. Frequent Beeping on Startup

Some motherboards emit beeping sounds during startup to indicate hardware problems. If the beeping pattern is new or matches the code for a BIOS battery issue (check your motherboard manual), it's time to investigate.

When to Replace the BIOS Battery

Most BIOS batteries last between 5 to 10 years. If your computer is older or you're experiencing any of the signs above, it's a good idea to check the battery. Here is the guide to replace the computer motherboard battery. Keeping a fresh battery ensures your system runs smoothly and avoids unnecessary frustrations.

With this guide, you can identify and address BIOS battery issues before they become bigger problems. Regular maintenance helps keep your PC in good health!