Troubleshooting the error: “low system battery voltage” message

  • When using a Windows 10 computer, you may encounter a variety of errors, some of which are related to the operating system.
  • In most cases, the culprit is the BIOS battery, which needs to be replaced.
  • The life of the CMOS battery is short, and after a few years it is no longer able to provide the voltage needed to run the BIOS, and this problem occurs.
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Some errors may occur due to a malfunctioning operating system, while others may be caused by a malfunctioning hardware device while using a Windows 10 computer. When you try to start your device and receive a “System battery voltage low” error message, the problem is primarily a hardware issue. In any case, the following instructions will help you better understand this error and give you some troubleshooting tips to help you fix it.

When I boot my computer, I receive an error message saying that the battery voltage is low of Alert System. To resolve this error, you need to replace the CMOS battery, adjust the date and time in BIOS, and so on. It is also possible to update your BIOS to resolve this issue.

If the CMOS battery is depleted or not working properly or if an error sensor is present, the BIOS will be unable to get the hardware information from the CMOS.

You may already know that the BIOS runs in the background whenever you start your computer or reboot it. As it is the interface which runs boot programs and the Windows operating system itself, a malfunction in the BIOS software can cause boot problems and other severe problems. Therefore, the error “System battery voltage is low” occurs. A malfunction with a hardware component connected to the motherboard is indicated by this particular interface (system battery voltage low).

For code 29 or other hardware-related error codes, simply clearing CMOS is the only way to resolve them. CMOS errors can also include low battery voltages, CMOS checksums, battery failures, and errors in reading data.

You will need to replace the BIOS battery in most cases. In order to replace the BIOS battery, you need some technical expertise regarding the hardware, as the BIOS is operated by a special battery attached to the motherboard. If you are having trouble with your BIOS battery, we recommend you contact a service center for assistance. However, there are also cases when the BIOS battery isn’t a real issue.

Dell Alert System Battery Voltage Is Low

If you know that the battery is correct, then there is something else wrong. If you do not know why he gives you an error message, then it may be an error with the battery. If the battery is normal, it normally has a voltage between 3.2-3.3 volts if not connected. If it does not have 3.2-3.3 volts, it is not good, but it must work. If it does not have 2.8 volts, it may not work.

Try the following diagnostic methods before replacement of this hardware component.

What is the cause of the “Low system voltage” error in Windows?

What causes a "Low system battery voltage" error in Windows?

System Battery Voltage Is Low Dell Optiplex 755

Changing the battery likely reset the BIOS to defaults, which may cause Windows not to boot if you are running Windows in one setting. If your computer is set to SATA, change it to IDE or Legacy.

Lenovo Battery Voltage Incorrect

Yesterday, my cat with his tail swept a cup of orange juice on the lenovo legion 5 touchpad. There was not that much, so I did not even thought that something may happen .But today when I turn on my computer I got error message battery voltage incorrect, 255% available.I restarted it couple of times and it disappear.Now it is 52% plugged in, charging, but in reality it not charging.
Its hard to believe that couple drops would kill battery.
As my warranty expire couple of weeks ago, that should I do, is it seriously?

All of the methods listed below are based on two obvious causes: the BIOS and the CMOS battery. There are not many reasons for this error, and most of them have to do with hardware failure on the system.

Your CMOS battery needs to be reinstalled or replaced – If the battery is slightly out of the socket, this can cause a drop in power voltage and an error. Also, the life of the CMOS battery is short, and after a few years it is no longer able to provide the voltage needed to run the BIOS, and this problem occurs. Consider reintegrating them or replacing them with new ones.

Incorrect BIOS settings – The problem could also be caused by incorrect BIOS settings, possibly related to new devices you added. In either case, simply clear the system event log or update the BIOS to resolve the problem.

How can I fix “Low system voltage”?

Updated: December 2023

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A low battery warning or battery urgency message is displayed on your meter. Mail cannot be sent at this time.

How do I fix the "Low system battery voltage" error?

Replace the CMOS battery

Every time the computer is turned on, the motherboard’s detection circuitry will display a low battery warning. This value is determined by the age of the motherboard.

In most cases (99%), the problem can be easily solved by replacing the CMOS part cell. Make sure that the battery to be replaced is a 3V CR2032 lithium battery. Get your system up and running. In order for the motherboard to recognize the new battery without problems, the computer must be turned on three times. The first cycle is to replace the battery and reboot the system. In the second step, if you still see the error, reboot the computer and go to the BIOS settings. From there, go to Maintenance, open the menu, and select “Default” from the list of options displayed. Save the settings and exit,

Set the date and the time in the BIOS

Make sure your current time zone is correct by right-clicking the date and time in the bottom right corner of your screen and selecting Adjust Date/Time.

You can change the time by unchecking Set time automatically, then clicking Change. You can set the time the way you prefer.

Resetting/updating CMOS/BIOS

There is a possibility that ESCD (Extended System Configuration Data) information in the BIOS may become corrupt for unknown reasons. As a result, it may be necessary to reset the BIOS (Complementary Metal-Oxide-Semiconductors) or NVRAM (Nonvolatile Random Access Memory) to “Factory Defaults” or, in other cases, to erase the NVRAM.

  1. You can now remove the computer cover after you have turned off the computer and unplugged the power cord.
  2. The motherboard contains a 2-pin password entry connector (PSWD).
  3. The jumper connector with two pins must be removed.
  4. Put the double-pin password jumper connector on the pins of the CMOS jumper (RTCRST) on the system board.
  5. Wait for the CMOS to clear a few seconds after connecting power to the system.
  6. Remove the computer cover, connect the 2-pin jumper connector, and replace it.
  7. Last but not least, turn on the computer and the devices by plugging them into the outlets.

In order to avoid damaging your computer permanently, we recommend you ask a professional to help you if you are unable to access the BIOS.

Make sure to inspect your motherboard.

You may be experiencing this message if one or more motherboard components have been damaged since you bought your computer just a few years ago. This should not happen to relatively new devices since CMOS chips are designed to last for years on built-in batteries.

Ensure that the connections between the components on the motherboard are correct. Check all the pins and cables connecting the components. It is important that your laptop’s motherboard is properly configured, and you must take the laptop apart to determine its true condition. It is best to have it repaired by a service center if you do not have the expertise to do this.

Make sure to inspect the controllers before they are used

Whenever a controller on your motherboard develops a problem, it usually means there is a leak. When the leak occurs, many important components break down, causing your system to issue false error messages.

When you restart or start Windows, you may receive the “System battery voltage low” error message. You can fix this by resetting the controller.

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Most Frequently Asked Questions

  1. Reset/update BIOS. If the BIOS is available, now is the time to reset it.
  2. Set the date and time in the BIOS. If the BIOS is supposed to be available, check the system date and time.
  3. Check the integrity of the motherboard.
  4. Check the controllers.
  5. Replace the BIOS battery.

In all cases, simply clear the system event log or update the BIOS to resolve the problem.

Solution 1: Reinstall or replace the CMOS battery.
Solution 2: Clear the system event log.
Solution 3: Update the computer BIOS.

The battery voltage is between 11.8 and 12 volts. A low voltage battery means that you should be prepared to charge the battery or replace it (depending on the overall condition of the battery). A low-voltage battery can be used to start the engine, but it is more likely to fail.

The word CMOS is an acronym for "complementary metal-oxide-semiconductor." A CMOS battery is a small, round battery that allows you to store a day, an hour, and a month on your computer. If the CMOS battery is depleted, the BIOS loses data and the computer may fail.

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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog,, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.