How to replace CMOS battery – What is the backup battery? The CMOS (Complementary Metal Oxide Semiconductor) battery powers the CMOS chip when the PC shuts down. This chip contains BIOS information and settings. So, to reset the BIOS settings, we can remove the CMOS battery. Replacing the CMOS battery is quite simple. However, spotting it can be quite difficult, especially for beginners. In this article, we will show you how to find it and how to replace the backup battery. But first, let’s see why we need to change CMOS battery.
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Removing the CMOS battery will reset all BIOS settings to their default values. So, if we have a PC that won’t boot due to an error in the BIOS setting, we can try to replace the CMOS battery to fix the problem. Another reason we need to remove the CMOS battery is that it is dead. Your computer’s BIOS will continue to reset itself every time you turn off your computer when the CMOS battery is low.
Depending on the type of motherboard, there are two ways a CMOS battery is connected to it. For ATX-sized motherboards, the CMOS battery is connected directly to the motherboard without cables. However, on mini-ITX motherboards, the CMOS is wrapped in colored insulating plastic connected to a header on the motherboard with a red and black cable.
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Removing the battery from the motherboard is quite simple as it is enough to press with a small metal lever that brings it out. However, novice PC builders may have trouble locating the CMOS battery as its location on the motherboard varies by manufacturer.
We have mentioned the following steps to simplify the backup battery removal process. Please follow them one after the other. Before you start, follow these steps to download the motherboard.
Now, follow these processes to take out the battery.
First we need to access the motherboard by removing the side panel. Please follow these steps to remove the side panel.
The physical structure of the CMOS battery is like that of a clock, flat and cylindrical, just like a coin. To locate it, scan the motherboard and find a component that looks like a silver coin, to be precise.
For medium to large motherboards, check around the PCIe Express or DIMM slots (RAM slots), as these chips are generally found around these areas. There is only one flat circular component in the motherboard, so it’s hard to miss. Once identified, check the sign on top of the battery. It should have a + sign. We should remember, inserting the battery incorrectly will not work. Therefore, the BIOS will continue to reset itself every time the computer is turned off.
For smaller motherboards like the mini-ITX, check the board for one colored insulating plastic wrap. This plastic wraps around the CMOS battery. This colored plastic can be black, yellow, red, blue, or any insulating plastic. If you are having trouble locating the battery, you can always refer to your motherboard user manual.
Also read: How to check the battery status of your Windows 10 PC
Depending on the size of your motherboard, follow the steps accordingly.
For larger motherboards that have a separate slot for the battery, follow these steps to remove it.
If you have trouble using the lock, using a small, thin pin to remove the backup battery is also a viable option. However, make sure this pin is not conductive, such as a toothpick.
On a smaller motherboard, a wire is connected to the battery. Simply disconnect the cable that connects the battery to the motherboard. However, before disconnecting this cable, check its header to see how it connects to the motherboard. This is done so that you can easily reinsert the battery into the motherboard.
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