What Happens When CMOS Battery Dies?

CMOS batteries are used in your computer and can be found in many other devices. They are rechargeable lithium-ion batteries that allow your device to keep track of time, date, and even temperature.

If you want to know what happens when your CMOS battery dies, read this article to learn more…

CMOS Battery Basics

A CMOS battery, also known as a refresh memory or system battery, is a small, non-rechargeable lithium-ion battery that stores information about the computer’s settings and operating status.

When it dies, the CMOS battery may lose information about the computer’s configuration and current settings. This can result in problems with the computer and possibly loss of data.

If your CMOS battery fails, you will likely see one or more of the following symptoms:

  • The computer won’t start.
  • The computer displays an error message, such as “CMOS checksum error” or “CMOS failed”
  • The computer doesn’t recognize any hard drives or passwords.

You may fix some of these problems by resetting your computer (see below). However, if your CMOS battery is completely dead, your only option may be to replace it.

What Happens When the CMOS Battery Dies?

When the CMOS battery dies, it prevents the computer from booting up. This can be a big problem if you use your computer to take exams or run business applications. Fortunately, there are ways to fix a CMOS battery-dead computer.

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How to Replace a CMOS Battery

When your CMOS battery dies, your computer will not be able to start. To replace the battery in a Dell Inspirion N5150 laptop, follow these steps:

  1. Boot up your computer and let it turn on for about 5 minutes so the BIOS can recognize new hardware.
  2. Remove the side panel by gently prying it off from the bottom of the laptop.
  3. Locate the battery and unscrew it with a Phillips head screwdriver
  4. Replace the old battery with a new one and screw it back in place
  5. Reconnect all cables
  6. Replace the side panel
  7. Boot up your computer

Tips for Fixing the Problem

If your computer’s CMOS battery dies, it can cause problems with the computer. The easiest way to fix this is to replace the battery. Here are some tips on how to do that: 

1. If you have a laptop, remove the battery and unscrew the cover. 

2. If you have a desktop, remove the screws in the back and pull off the bottom panel. 

3. Remove the old battery and put in the new one. 

4. Replace any screws or panels that were removed and screw them back in place.

What Happens When You Replace a CMOS Battery?

The computer may not start up properly when you replace a CMOS battery. The new battery may not have enough power to turn on the computer’s hardware fully.

In some cases, this can cause problems with the computer, including frozen screens and missing icons. If these problems persist despite trying different methods, it may be time to take your computer in for repair.

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How Do I Know if My CMOS Battery is Dying?

If your computer is having trouble starting up or the CMOS battery is not charging, it may be time to replace it. You can check whether or not your CMOS battery is failing by doing the following: Turn on your computer and wait until the boot screen appears.

If you see a message saying “CMOS checksum error,” your CMOS battery is likely dead. If you do not see this message, then your CMOS battery may still be viable, but it may need to be replaced soon. To replace the CMOS battery, follow these steps: 

  1. Unplug all cables from your computer and remove any external drives.
  2. Open the case of your computer by removing the side panels.
  3. Locate and unscrew the four screws in the motherboard’s bottom (usually near the memory slots).
  4. Carefully remove the motherboard from the case.
  5. Follow the cable routing until you find the CMOS battery, typically located behind a plastic shroud near where power and data cables enter and exit the board.
  1. Replace the old CMOS battery with a new one by gently prying it out of its socket and replacing it with the new one. Make sure all connections are secure before screwing everything back together – especially around those pesky memory slots!

How to Prevent Dead CMOS Battery

You can do a few things to prevent your computer’s CMOS battery from dying, including regularly checking the battery’s level and replacing it when needed.

Additionally, make sure that your computer is plugged into an outlet when not in use and keep its power cord unplugged when not in use to conserve energy.

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Watch the video to know more about CMOS battery

Frequently Asked Questions

What Happens When CMOS Battery Dies?

When a CMOS battery dies, the computer will no longer be able to boot up or access any of its internal files. If the computer is a laptop, this may also mean that the hard drive won’t be accessible. In most cases, you’ll need to replace the CMOS battery if it dies. 

How Do I Change the CMOS Battery in My Computer?

You must open up the computer’s case and remove the CMOS battery. Most laptops have a screw on the underside of the case that you can use to remove it. Once the battery is out, you can replace it with a new one. Be sure to follow the instructions that come with your new battery.

 Can I Override a CMOS Battery in a Computer?

Yes, you can override a CMOS battery in a computer. However, this is not recommended unless you are experienced with working with computers and know what you are doing. Overriding a CMOS battery can result in serious damage to the computer and may void the warranty.


If your CMOS battery dies, you’ll likely experience a loss of function in your camera. This means that you won’t be able to take pictures or be limited to taking pictures saved on your internal memory.

In some cases, you might also experience problems with the shutter clicking open and closing properly. If this happens to you, getting your camera repaired as soon as possible is important so you can continue using it normally.

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Matt Wilson
By Matt Wilson

Matt Wilson is a PC gaming and hardware expert with years of experience. He's a trusted tech product reviewer for gamers and tech enthusiasts.

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