If you’re like me, you probably don’t think about the CMOS battery on your motherboard until it dies and your computer starts acting weird. Then you scramble to order a new one online (or go to your local computer shop) and hope that it’s not too late to save your data.

In this guide, I’ll answer these questions and more. So read on for information on the CMOS battery life, how to replace it, and some tips on how to keep it running as long as possible.

How Long Does Motherboard CMOS Battery Last?

The CMOS battery on a motherboard typically lasts three to five years.

The CMOS battery is a small, coin-shaped battery that powers the real-time clock (RTC) on a motherboard. The RTC keeps track of the time and date even when the computer is turned off.How Long Does Motherboard CMOS Battery Last?

If the CMOS battery dies, the RTC will stop functioning and the time and date will no longer be accurate. You may also experience problems starting your computer or accessing your hard drive if the CMOS battery is dead.

To check the status of your CMOS battery, open System Information in Windows 10 by pressing Windows+X and selecting System. Look for Battery Type under Hardware Resources > Power Management.

How often should the CMOS battery be replaced?

The CMOS battery should be replaced every 2-3 years.

The CMOS battery is a small, coin-shaped battery that helps to keep the date and time settings on your computer accurate. It’s usually located near the CPU of your computer, and you can replace it yourself using a small screwdriver.

If your computer starts to lose track of the date and time, or if you notice that the time changes randomly or gets reset to 00:00 all the time, it might be a sign that your CMOS battery is no longer working properly. In this case, you should replace it as soon as possible.

Do CMOS batteries run out?

Yes, CMOS batteries do run out. However, they usually last for around 3-5 years before needing to be replaced.

CMOS batteries are used to store the clock and BIOS settings on your computer. When they run out, you’ll start to see errors like “CMOS checksum error – defaults loaded” or “No battery detected – System halted.”

If you’re seeing these errors, it’s a sign that your CMOS battery needs to be replaced. You can find replacement CMOS batteries online or at your local computer store.

What happens if I don’t Replace CMOS Battery?

If you don’t replace the CMOS battery, the time, date, and other system settings on your computer will eventually reset to their default values.

The CMOS battery is a small battery that keeps the time and date settings stored in your computer’s memory. If it runs out of power or if it is removed from the computer, the time and date settings will reset to their default values.

Some computers have a backup battery that maintains the time and date settings even if the CMOS battery dies. But most computers do not have this backup battery, so if the CMOS battery dies, the time and date settings will reset to their default values.

Is it Worth Replacing CMOS Battery?

Yes, it is worth replacing the CMOS battery, especially if you’re experiencing problems with your computer or if you plan to keep your computer for a while.

When the CMOS battery dies, your computer will lose its time and date settings, and it may not be able to boot up properly. If you have difficulty starting up your computer or if you see an error message that says “CMOS checksum error-default configuration used,” then it’s probably time to replace the CMOS battery.

If your computer is fairly new, then the CMOS battery should last anywhere from 3 to 5 years. 

How much does a CMOS battery cost?

A CMOS battery replacement can cost anywhere from $50 to $300, depending on the laptop model, make, and size of the battery. Larger batteries tend to cost more than smaller ones. And some luxury laptop models might have a more expensive CMOS battery, as well.

Some people try to save money by replacing the CMOS battery themselves. However, this can be risky if you’re not familiar with how to do it or if you don’t have the right tools. It’s always best to consult a professional if you’re not sure how to go about replacing your CMOS battery.

How do I check my CMOS battery health?

Your CMOS battery is responsible for powering your computer’s clock and preserving your BIOS settings when the computer is turned off. A weak or dead CMOS battery can cause all sorts of problems, such as a loss of date and time, an inability to boot up the computer, or even a corrupted BIOS.

There are a few ways to check the health of your CMOS battery. One way is to open up your computer and take a look at the battery itself. If it’s bulging or leaking, then it’s likely that the battery is no longer functioning correctly. You can also test the battery using a voltmeter. If the voltage reading is below 3 volts, then the battery is likely weak or dead.

What is a typical symptom of a CMOS battery failure?

Symptoms of a CMOS battery failure can vary depending on the make and model of your computer, but generally, you may see one or more of the following:

  • The computer will not start
  • The computer’s time or date is incorrect
  • System errors occur when the computer starts up
  • You cannot save data to your hard drive

If you experience any of these symptoms, your CMOS battery likely needs to be replaced.


The motherboard CMOS battery is a very important part of the motherboard and it should last for a long time. The average lifespan of a motherboard CMOS battery is 3 to 5 years.

There are some things you can do to prolong the life of your motherboard’s CMOS battery. If your motherboard’s CMOS battery dies, there are ways to replace it. 

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Saqib Ali

Saqib Ali, A passionate blogger and Computer Geek help people to build their dream PC. He spends hours in research to pick the right products and then test them and suggest people in guides on Finest Desktop.