You may also get errors, such as “CMOS Read Error”, “CMOS Battery Failure” and “CMOS Checksum Error”. Other key symptoms of a failing CMOS battery include problems in the boot process and a constant beep from the motherboard. But if your computer displays the wrong system time or date after a reboot or if you have hardware compatibility issues, it may be time to replace the CMOS battery. Most CMOS batteries last between two and 10 years, depending on the use of the computer. And since CMOS battery removal or failure has traditionally been associated with deleting CMOS data, modern motherboards also reset the UEFI settings when the CMOS battery fails. That said, CMOS batteries are still used for keep time on your computer. However, modern UEFI motherboards use non-volatile memory or NVRAM to store UEFI configuration data Non-volatile memory can retain data even without power applied. Therefore, a battery was used to provide power to the memory even after the computer was turned off or the power cord was removed. Volatile memory loses data when it loses power. Traditionally it was used to power the CMOS, as older motherboards used volatile memory to store BIOS settings. The CMOS battery is usually a CR2032 lithium button battery on the motherboard of your computer. And if your CMOS clears or your battery fails, you lose all your BIOS settings and revert to default settings.
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So CMOS can be essential for the stable operation of your computer. These changes, along with the system date and time, are saved to CMOS. However, as The BIOS is stored in read-only memory, you cannot save any changes you make to your settings, such as adjustments to the boot order or overclock settings. It is responsible for initializing your computer’s hardware, testing it, and booting the operating system when you press the power button. BIOS, short for Basic Input Output System, is a firmware that comes with the Motherboard.
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To understand the relationship between BIOS and CMOS, it helps to know the role of a BIOS in your computer.