When using a Windows 10 computer, you may encounter a variety of errors, some of which are related to the actual operating system and some of which are caused by hardware failures. If you recently received a “System battery voltage low” error message when trying to start your device, it’s primarily a hardware problem. In any case, the following instructions will tell you more about this particular error and give you some troubleshooting techniques that can help you restore your PC.
As you know, when you boot or reboot your machine, the BIOS runs in the background. It is the interface that runs the boot programs and the Windows system itself. So, if the BIOS software doesn’t work properly, you will have problems booting as well as other serious malfunctions. Therefore, the “System battery voltage is low” error. (system battery voltage low) is displayed by this particular interface, indicating a problem with a hardware component connected to the motherboard.
In most cases, the culprit is the BIOS battery, which needs to be replaced. Yes, the BIOS operates with a special battery attached to the motherboard, which means that replacing this battery may require some technical expertise related to the hardware. Otherwise, we recommend that you take your device to a service center and seek technical support. However, there are also situations where the BIOS battery is not a real problem.
Therefore, before you consider replacing this hardware component, try the following diagnostic methods.
What causes a “Low system battery voltage” error in Windows?
There are not many reasons for this error, and they are mostly related to the BIOS or CMOS battery. However, there are two obvious causes, and all of the methods listed below are based on them:
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 do I fix the “Low system battery voltage” error?
Replace the CMOS battery
The motherboard’s detection circuitry has a minimum voltage threshold of 2.7 to 2.9V (this value varies depending on the age of the board). Any value lower than that will inevitably result in a low battery message every time the computer is turned on.
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,
Setting the date and time in the BIOS
If you have the date and time wrong, you may need to change the time zone. To do this, right-click the date and time in the Windows notification area at the bottom right of the screen and select Adjust Date/Time. At this point, make sure that the time zone you set is correct.
To change the time manually, uncheck Set time automatically and click Change. Set the correct time.
It may happen that the information stored in the BIOS as ESCD (Extended System Configuration Data) is corrupted for unknown reasons. Under such circumstances it may be necessary to reset the BIOS or CMOS (Complementary metal-oxide-semiconductor) to “Factory Defaults” or, in other cases, erase the NVRAM (Nonvolatile Random Access Memory). Follow these steps.
- Turn off the computer and unplug the power cord from the power outlet. You can now remove the computer cover.
- Expose and locate the 2-pin password entry connector (PSWD) on the motherboard.
- Remove the 2-pin jumper connector.
- Now locate the 2-pin CMOS jumper (RTCRST) on the system board and insert the 2-pin password jumper connector onto the CMOS jumper pins.
- Then connect power to the system and wait a few seconds for the CMOS to clear.
- Connect the 2-pin jumper connector to the password jumper and replace the computer cover.
- Finally, plug the computer and devices into the outlets and turn them on.
Note that by using this method, you run a significant risk of permanently damaging the computer. Therefore, if you cannot access the BIOS, it is recommended that you take your computer to a professional and ask for help, rather than doing it yourself.
Check your motherboard carefully
If you bought your computer only a few years ago, there is a good chance that the “System Battery Low” message is due to damage to one or more motherboard components. Most manufacturers design the CMOS chips in computers to run for years on their built-in batteries, so relatively new devices should not experience this problem.
Check all the pins and cables that connect the components on the motherboard. Make sure that the correct connections are being used. Make sure that all affected devices are properly configured. To determine the actual condition of your computer’s motherboard, you will need to take the laptop apart. If you don’t have the expertise to do this, you will have to take it to a service center to have it repaired.
Check the controllers in use
If there is a problem with one of the controllers used on the motherboard, there is probably a leak. In such scenarios, many important components will stop working, causing your system to produce false error messages or false problem notifications.
If you notice a problem with the controller, you should fix it so that the “System battery voltage low” message is no longer displayed. This solution may be effective if the error message appears when you start Windows or restart the PC.
Frequently Asked Questions
- Reset/update BIOS. If the BIOS is available, now is the time to reset it.
- Set the date and time in the BIOS. If the BIOS is supposed to be available, check the system date and time.
- Check the integrity of the motherboard.
- Check the controllers.
- 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.