What is it & How does it work?
The motherboard contains a small sized circular shaped CMOS battery that is used for the computer to store the time and date settings, onto an on-board CMOS memory chip. If this battery becomes faulty or dead, every time you start your computer up, the time and date settings will be reset and you will have to correct them. This can cause frustration because you will have to go into the BIOS and manually set them each time you want to use your computer. If you don't correct them, the internet and existing installed programs will not work properly. The reason why this happens is because the CMOS memory chip doesn't get any power from the 3 Volt lithium CMOS battery to revitalize it, when the computer is powered off. This will cause the time and date settings on the CMOS memory chip to become none existent next time when you power on your computer. So you will need to replace the current dead CMOS battery installed onto the motherboard with a brand new one of the same type to overcome this problem.
Instructions on Replacing the Motherboard Battery
1) You will need to remove the 'Side Panel' from the computer's 'Case', so you can access the motherboard. You will find two or more 'Philips Head' screws on the 'Rear' of the computer case, which is holding the side panel in place. So using a 'Philips' head screwdriver, unscrew all screws that relate to the side panel.
2) Now that you have removed the screws, place your hands on the side panel and push it in the left direction. This method will unlock and release the side panel from the computer case. Once removed, place it against a wall, so it is out of the way.
3) Somewhere on the 'Motherboard' you will see the 'CMOS Battery', it looks like a coin and is a silver color. Different motherboard manufacturers place it in different locations, so there is no specific location to look at on the motherboard to find it straightaway. Once you have located it, you are now ready to proceed with the next step.
4) The 'CMOS Battery' is held inside a 'Battery Compartment' that has a metal clip that holds it in place, to securely hold it down and prevent it from falling out, when moving your PC tower. So using a 'Flat' head screwdriver, insert the 'Flat' end into the silver color 'Release Clip' found at the bottom or top of the battery to pry it out.
5) Once you have done that, you are now ready to install the new battery, so remove the packaging from the new 'CMOS Battery'. The correct way to insert the battery into the compartment found on the motherboard is to hold the battery with the writing side upwards and using your fingers to push it in. You will hear a 'Click' sound when installed properly, this means that the battery is locked in and is done correctly.
6) Replace the side panel you removed earlier on, along with its screws and using your screwdriver to tighten them all. All you need to do now is to switch on your computer and update the time and date settings in the BIOS. So the time and date configuration is correct and next time when you start your computer up, the settings will be remembered.
5) Once you have done that, you are now ready to install the new battery, so remove the packaging from the new 'CMOS Battery'. The correct way to insert the battery into the compartment found on the motherboard is to hold the battery with the writing side upwards and using your fingers to push it in. You will hear a 'Click' sound when installed properly, this means that the battery is locked in and is done correctly.
6) Replace the side panel you removed earlier on, along with its screws and using your screwdriver to tighten them all. All you need to do now is to switch on your computer and update the time and date settings in the BIOS. So the time and date configuration is correct and next time when you start your computer up, the settings will be remembered.
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