How to Check CMOS Battery Status in Windows 11: A Step-by-Step Guide

How to Check CMOS Battery Status in Windows 11

Checking the CMOS battery status in Windows 11 is not as complicated as it sounds. Essentially, you’ll be diving into the BIOS settings or using some specialized software tools. This guide will walk you through each step, making it easy to check whether your CMOS battery is still in good shape or needs a replacement.

How to Check CMOS Battery Status in Windows 11

This section will guide you on how to check the CMOS battery status in your Windows 11 machine. By following these steps, you will be able to determine if your CMOS battery is working correctly or if it needs replacement.

Step 1: Restart your computer

Restart your computer and begin pressing the appropriate key (usually F2, DEL, or ESC) to enter the BIOS setup.

When you restart your computer, you need to act quickly to get into the BIOS setup. Different manufacturers use different keys for this, so you may need to try a few times or check your computer’s manual.

Step 2: Navigate to the Power or Health Section

Once in the BIOS, navigate to the section labeled "Power" or "Health."

These sections often contain various system statistics, including information about your CMOS battery. Be prepared to use your keyboard to navigate through the menus.

Step 3: Locate the CMOS Battery Status

Look for a status indicator that mentions the CMOS battery or its voltage.

You’ll typically find a readout of the battery’s voltage. A healthy CMOS battery usually has a voltage of around 3V. Anything significantly lower might indicate a dying battery.

Step 4: Exit the BIOS

After noting the battery status, exit the BIOS by following the on-screen instructions.

Make sure to exit without saving any changes if you haven’t altered any settings. This will bring you back to your Windows 11 operating system.

Step 5: Use Specialized Software (Optional)

If accessing the BIOS sounds daunting, you can use specialized software like HWMonitor to check the battery status directly from Windows.

Software tools can make this process easier by providing a user-friendly interface to check various system metrics, including the CMOS battery status.

After completing these steps, you should have a clear indication of your CMOS battery’s health. If the battery voltage is low, consider replacing it to avoid future system issues.

Tips for Checking CMOS Battery Status in Windows 11

  • Know Your BIOS Key: Different manufacturers use different keys to enter the BIOS. Knowing the correct key saves time.
  • Regular Checks: Make it a habit to check your CMOS battery status periodically, especially on older machines.
  • Use Reliable Software: If you’re uncomfortable diving into the BIOS, use reputable software tools like HWMonitor.
  • Backup Settings: Before replacing a CMOS battery, note down your BIOS settings, as they will reset to defaults.
  • Look for Symptoms: Common signs of a failing CMOS battery include incorrect system time and BIOS settings resetting every boot.

Frequently Asked Questions about Checking CMOS Battery Status in Windows 11

What is a CMOS battery?

The CMOS battery powers the BIOS firmware in your computer, which stores system settings and keeps the real-time clock running.

How long does a CMOS battery last?

A typical CMOS battery lasts between 3 to 5 years, but this can vary depending on the usage and environment.

What happens if my CMOS battery dies?

If your CMOS battery dies, your computer may lose BIOS settings and be unable to keep the correct time and date.

Can I replace the CMOS battery myself?

Yes, replacing a CMOS battery is usually a straightforward process. Make sure your computer is turned off and unplugged before attempting to replace it.

How do I know if my CMOS battery needs replacing?

Common signs include incorrect system time or BIOS settings resetting to default every time you restart your computer.


  1. Restart your computer.
  2. Enter BIOS setup.
  3. Navigate to the Power or Health section.
  4. Locate the CMOS battery status.
  5. Exit the BIOS.
  6. Use specialized software (optional).


Checking the CMOS battery status in Windows 11 is a simple but crucial task to ensure your computer runs smoothly. By following the steps outlined above, you can easily determine whether your battery is still in good condition or in need of replacement. Keeping an eye on your CMOS battery can save you from a myriad of problems down the road, such as incorrect system time and lost BIOS settings.

It’s always a good idea to be proactive rather than reactive when it comes to your computer’s health. Make it a routine to check various components, including the CMOS battery, to ensure they’re functioning correctly. If you find that your CMOS battery is failing, replace it promptly to avoid any disruptions.

So, go ahead and check that CMOS battery status on your Windows 11 machine today. It’s a small step that can make a big difference!