What is a CMOS battery and how can it be replaced?
Most Acer computers contain a CMOS (Complementary Metal Oxide Semiconductor) battery that provides power to the CMOS chip to allow the computer to save settings when it is turned off. The CMOS battery is generally a coin-cell CR-2032 battery that will generally last the lifetime of your product.
How to tell if your CMOS battery is bad
If your CMOS battery fails, your system will revert to the factory settings and you may notice that the time keeps resetting on your computer. You can check to see if the CMOS battery is working by accessing your BIOS/UEFI and checking the time in the BIOS/UEFI. If the clock time in the BIOS resets every time your computer restarts or is powered off, then your CMOS battery is most likely bad.
Replacing your CMOS battery
In general, it is fairly easy to replace your CMOS battery if you can easily access it. Make sure your computer is unplugged and you are properly grounded with an anti-static device.
Notebook, Laptops and Tablets
Notebook computers often require partial disassembly to access the CMOS battery. If you believe your CMOS battery is bad, we recommend you contact customer service for assistance.
Desktops
- Make sure you are properly grounded with an anti-static wrist strap or comparable device.
- Unplug your computer and remove the two screws securing the side panel to the chassis.
- Locate the CMOS battery and remove it.
- Install a new CMOS battery and make sure it is fully seated.
- Replace the case and reconnect power to the system.
- Enter the BIOS/EUFI and set the correct time and date.
Note: Damages caused by improper assembly or battery installation are not covered under warranty.
