What Happens When RTC Battery Dies?

Published on: November 8, 2022
Written by Jonas Frank / Fact-checked by Nova Scarlett

When the RTC battery dies, the system will be unable to keep track of time. This can cause a number of problems, including the inability to properly boot up the computer or maintain accurate timekeeping. In some cases, it may even lead to data loss.

what happens when rtc battery dies

When the RTC battery dies, it can cause a number of problems. The most common problem is that the clock will reset and you will lose all your settings. This can be a nuisance if you have to set the clock every time you turn on your computer.

Other problems that can occur are losing your CMOS settings, losing your BIOS password, or even corrupting your hard drive. In some cases, the only way to fix these problems is to replace the motherboard.

CMOS Battery Lifespan

A CMOS battery is a small, round, lithium battery that provides power to a computer’s Complementary Metal-Oxide Semiconductor (CMOS) chip. The CMOS chip contains information such as the system time and date, the BIOS settings, and the passwords for password-protected programs. A CMOS battery typically lasts two to six years.

If the battery dies, the CMOS chip will lose its data and the computer may not be able to start up. When a CMOS battery begins to fail, it will often cause problems with the computer’s startup process. The computer may display error messages or refuse to start up at all.

In some cases, replacing the CMOS battery will fix these problems. The lifespan of a CMOS battery depends on several factors, including how often the computer is used and how long it is left turned on. A laptop that is used frequently may need a new CMOS battery every two years, while a desktop that is only turned on for an hour or two each day may last four or five years between batteries. Without a CMOS battery, your computer would not be able to remember the current date and time.

If you are having difficulty with your computer starting up properly, it could be due to a failing CMOS battery. Replacing the battery is usually a quick and easy fix that can solve many common startup problems.

If your phone has a removable battery, you can charge it by removing the battery and placing it in a charger designed for your phone’s make and model.

Dead CMOS Battery No Boot

A CMOS battery is used to power the BIOS settings on a motherboard. If the battery dies, the BIOS settings will be reset and the computer may not boot up. In this blog post, we’ll discuss what to do if your CMOS battery dies and how to replace it.

If your computer won’t start because of a dead CMOS battery, you’ll need to replace it with a new one. Replacing the battery is easy and only takes a few minutes. You can buy a replacement battery at any electronics store or online.

Make sure you get the right type of battery for your motherboard – most use CR2032 batteries. To replace the battery, first, find its location on the motherboard. It’s usually marked with a symbol that looks like a coin or a watch’s battery.

Gently remove the old battery from its socket and insert the new one, making sure it’s facing the correct way (the + side should be up). Once the new battery is in place, reassemble your computer and try starting it up again – hopefully, it will now boot properly!

Dell CMOS Battery Failure Symptoms

If you’ve ever had a laptop that suddenly died without any warning, it’s likely that the CMOS battery was the culprit. The CMOS (complementary metal-oxide-semiconductor) battery provides power to the computer’s real-time clock and helps maintain system configuration information. When this battery fails, your computer can’t keep accurate time or remember certain settings.

As a result, you may experience any of the following symptoms: The date and time displayed in the BIOS setup screen are incorrect. Your computer randomly reboots or shuts down.

System configurations are reset when you restart your computer. You receive an error message on startup that says something like “CMOS Battery Failure” or “CMOS Checksum Error.” In some cases, a failing CMOS battery may also cause your computer to beep excessively or display error codes on startup.

If you’re experiencing any of these issues, it’s time to replace your CMOS battery.

CMOS Battery Price

As most people are aware, the price of CMOS batteries has been rising steadily over the past few years. This is due to a variety of factors, including an increase in demand from new and upcoming technologies, as well as a decrease in supply from manufacturers. While the rise in CMOS battery prices may seem like a negative trend, there are actually some positives to be taken from it.

For one, the higher prices are providing incentives for manufacturers to invest more in the research and development of new battery technologies. Additionally, the rise in prices is also helping to fund investments into recycling and reuse programs for old batteries, which will help to reduce waste and environmental impact in the long run. Overall, while the current situation with CMOS battery prices may be inconvenient for consumers in the short term, it is likely that these trends will lead to more positive outcomes in the future.

How to Remove CMOS Battery?

The CMOS battery is a long-lasting lithium battery that powers a computer’s real-time clock and saves BIOS settings. You’ll need to remove the battery if you want to reset your BIOS password or troubleshoot motherboard issues. This can be a difficult task, so we’ve put together a step-by-step guide on how to remove a CMOS battery. If your computer is running slowly, one possible reason is that the battery in your RTC (real-time clock) needs to be changed.

First, you’ll need to identify the type of battery that your motherboard uses. The most common type is the CR2032 coin cell, which looks like a large watch battery. Once you’ve identified the type of battery, it’s time to begin removing it.

1) Locate the BatteryThe first step is to find the CMOS battery on your motherboard. It’s usually located near the BIOS chip, which is often labeled “CMOS” or “RTC.” If you’re having trouble finding it, consult your motherboard’s manual for help.
2) Disconnect the PowerBefore touching any sensitive electronic components, it’s important to disconnect all power sources from your computer. This includes unplugging any AC adapters and/or removing the backup coin cell battery (if your motherboard has one). Once everything is disconnected, touch something metal (like the chassis of your computer case) to discharge any static electricity that may be present on your body.
3) Remove Battery Retaining ClipIn order to remove the CMOS battery, you’ll need to release it from its retaining clip or socket holder. On most motherboards, this will require using a small screwdriver or another tool to depress the locking mechanism before gently pulling out the battery (be careful not to force it out as this could damage delicate electronic components). Consult your motherboard manual for specific instructions on how to release/remove the retaining clip or socket holder.
4) Replace with New BatteryOnce you have successfully removed the old CMOS battery, simply insert a new one in its place making sure that its orientation is correct (the positive side of most batteries are marked with a “+” symbol).

HP Laptop CMOS Battery Location

The CMOS battery is located on the motherboard of your HP laptop. This battery is responsible for keeping track of the time and date, as well as other system settings. If your CMOS battery dies, you will need to replace it in order to keep your laptop running properly. It’s important to know that The RTC/CMOS battery is not the same as the main laptop battery or power adapter.

Here are instructions on how to find and replace the CMOS battery on your HP laptop: 1) Turn off your laptop and unplug it from any power source.

2) Remove the back panel by unscrewing the two screws that hold it in place.

3) Locate the CMOS battery on the motherboard. It should be a small, round, silver-colored battery.

4) Use a small screwdriver to carefully remove the old CMOS battery from the socket on the motherboard.

Be careful not to damage any other components while doing this.

5) Insert the new CMOS battery into its socket on the motherboard, making sure that it is oriented correctly (the positive side should be facing up). Screw it in place if necessary.

hp laptop cmos battery location
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Quick Facts

What are the Consequences of a Dead RTC Battery

If your RTC battery dies, you may experience a number of consequences. For one, your computer’s clock will reset to the date anfd time when the battery died. This can be especially inconvenient if the battery dies while you’re in the middle of using your computer.

Additionally, any programs that rely on the clock may also be affected. For example, if you have an alarm set for a certain time, it will no longer go off once the clock resets. Finally, your BIOS settings may also be reset to their defaults if your RTC battery dies.

Will a Dead CMOS Battery Prevent Power on?

A common problem that can prevent a computer from powering on is a dead CMOS battery. The CMOS battery keeps the settings in the BIOS memory and if it dies, the settings will be reset and can cause problems with booting up. If you suspect that your CMOS battery is dead, you can try replacing it with a new one.

What Will Happen If CMOS Battery is Removed?

If you remove the CMOS battery, the computer will lose all custom settings including time and date. The computer will also be unable to remember BIOS passwords or other settings.


Your computer’s real-time clock (RTC) keeps track of the current time and date. Most PCs have a battery backup for the RTC so that the time and date are not lost when the power is off. When this backup battery dies, your computer will reset the time and date to January 1, 1970, or some other random date.

This can be annoying, but it’s usually not a big deal. The RTC is only used by your computer to keep track of the time and date; it doesn’t affect your data or programs.

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