A computer’s BIOS (Basic Input/Output System) is a crucial component that initializes the hardware during the boot process and loads the operating system. The BIOS settings store important system configurations, including the time and date. A CMOS (Complementary Metal-Oxide Semiconductor) battery provides power to the BIOS chip, enabling it to retain these settings even when the computer is turned off.
Over time, the CMOS battery may weaken or fail, leading to incorrect system time and date, or even preventing the computer from booting properly. Therefore, it’s essential to check the BIOS battery regularly and replace it if necessary.