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The CMOS battery on a laptop is a small, coin-shaped battery that is responsible for powering the CMOS (Complementary Metal-Oxide-Semiconductor) chip. The CMOS chip is a vital component of the laptop’s motherboard, responsible for storing important system information such as date, time, and BIOS settings. Without the CMOS battery, these settings would be lost whenever the laptop is powered off or disconnected from a power source.
The CMOS battery’s primary effect is that it ensures the laptop retains its vital system information even when it is not actively powered. This means that even if you turn off or unplug your laptop, the CMOS battery will continue to supply power to the CMOS chip, preserving important settings such as the system boot order, hard drive information, and other configuration settings.
Over time, the CMOS battery may lose its ability to hold a charge, leading to potential issues such as incorrect time and date settings, BIOS configuration resets, or even failure to boot the laptop. When this happens, it becomes necessary to replace the CMOS battery.
Changing a CMOS battery can be a simple process. Start by shutting down the laptop and disconnecting it from any power source. Locate the CMOS battery on the motherboard, typically identified as a small, round silver or lithium battery. Carefully remove the old battery by either gently prying it out or unlatching it, depending on its securing mechanism. Take note of the battery’s orientation before removing it.
Next, insert the new battery into the same slot, aligning it correctly based on the markings or notches. Ensure that the new battery is securely in place before reassembling the laptop. Power on the laptop and access the BIOS settings to verify that the new CMOS battery has been installed correctly and that all configuration settings have been restored.
You’ve probably heard of CMOS batteries on your computer once. So what is a laptop CMOS battery? What effect? The article below will answer for you.
What is a laptop CMOS battery? What effect?
What is CMOS battery? Where on the laptop?
CMOS stands for the phrase Complementary Metal-Oxide Semiconductor, to refer to the chip with the feature to help the machine store information mounted on the computer motherboard.
To mount the CMOS, manufacturers use a small battery attached directly to the mainboard in a special location to provide power for the Complementary Metal-Oxide Semiconductor chip whether the laptop is connected to a power source or not.
Effect of CMOS battery
The CMOS battery provides power for the CMOS circuit board to operate stably to be able to save the exact configuration and time of the system.
The CMOS chip helps to store configuration information of other hardware components in the machine, and updates the date and time (time) continuously and takes that as the standard date and time for the system. Because it uses an independent power supply from the battery , this unit is capable of providing accurate information about the updated date and time on the computer even when the machine is in the off state .
In addition, the CMOS battery also helps save BIOS configuration information, when the battery runs out, the user encounters an error that the machine cannot be started or does not start up on the screen.
History of CMOS battery
The Motorola 146818 was one of the first CMOS chips used on IBM computers, with the ability to store 64 bytes of data.
Today most computer manufacturers include this chip with the Southbridge chip or Super I/O chip on the motherboard.
The battery of the CMOS chip can be used up to 10 years . However, this time may vary depending on usage and different models.
Does running out of CMOS battery affect the computer?
From the above effects on CMOS batteries, it is clear that running out of CMOS batteries affects computers such as computers displaying incorrect time in many cases leading to inability to access the internet , booting the machine is also affected. error and no screen pops up.
Instructions for replacing the laptop CMOS battery
How do I know if the CMOS battery is dead?
If the CMOS battery is dead, the computer will display the wrong time after you turn it off and on again. In addition, when you start the machine, one of the following 4 lines of error messages will appear:
- CMOS Read Error
- CMOS Checksum Error
- CMOS Battery Failure
- System battery voltage is low
Instructions for replacing the CMOS battery
Step 1 : Open the computer case and find the battery on the motherboard.
Verify that the case can be removed before doing so. Most computers today use a coin-shaped circular CMOS battery.
Some CMOS batteries can be held in place by metal clips or bars. The battery can be removed by sliding it out from below.
If you cannot locate the CMOS battery, consult your motherboard’s documentation or contact your computer manufacturer.
Step 2 : Get information about CMOS battery.
Most manufacturers do not list the exact battery type and model of the CMOS battery. Once you have located the battery, we recommend that you write down its specifications (voltage, components, wiring). If possible, remove the battery and take it to a new battery store for accurate matching.
For most computers, the model of the battery is CR2032 .
Step 3 : Remove the battery .
If your computer is using a coin cell battery, removing the battery is relatively simple. Use your fingers to grab the edge of the battery and pull it up and out of the socket holding the battery. Some motherboards have a clip that holds the battery down. If your computer’s motherboard has this clip, you may need to use one hand to move the clip up and the other to pull the battery out.
Note that, not all CMOS batteries are removable. If your computer does not have a coin-cell CMOS battery, refer to your documentation or contact the computer manufacturer for further assistance.
Step 4 : Insert a new battery
After purchasing a new battery, remove the old battery and replace it with a new one, or insert the new battery into the secondary battery socket on the motherboard.
Step 5 : Enter CMOS value
Once the battery has been replaced, turn on the computer and reset the CMOS values to default. After entering all the values, be sure to save the settings before exiting. Many CMOS setups allow you to press a key, such as F10, to save the values and exit.
Above is an article that explains what a CMOS battery is and shows you how to properly replace this type of battery. Wishing you success!
In conclusion, the CMOS battery on a laptop is a small, round, button-like battery that is responsible for maintaining the date, time, and BIOS settings even when the laptop is powered off or disconnected from a power source. It provides a constant power supply to the CMOS chip, which stores this information.
The CMOS battery plays a crucial role in the overall functioning of a laptop as it ensures that the system clock is accurate and that the BIOS settings are preserved. Without a functioning CMOS battery, the laptop may experience issues such as incorrect system date and time, BIOS errors, and even failure to boot properly.
Changing the CMOS battery is a relatively simple process that can be done by following a few steps. Firstly, make sure to power off the laptop and unplug it from any power source. Then, locate the CMOS battery, which is often found near the edge of the motherboard and secured in place by a clip or holder. Carefully remove the old battery, taking note of its orientation, and insert the new battery in the same position, ensuring that the positive and negative terminals are correctly aligned. Finally, fasten the battery holder or clip back in place, and power on the laptop to verify that the BIOS settings have been preserved.
In summary, the CMOS battery is an essential component in a laptop that helps retain crucial system information. Changing the CMOS battery is a straightforward process and can be done by following a few simple steps. By maintaining a working CMOS battery, users can ensure that their laptops function properly with accurate system time and intact BIOS settings.
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