HardwareQuestion 10 of 100
What is the purpose of the CMOS battery on a motherboard?
a.To keep the system clock and BIOS settings powered when the computer is off
b.To provide backup power to the CPU during outages
c.To charge the laptop's main battery
d.To store the operating system
Explanation
The small CMOS battery, usually a coin cell, maintains the real-time clock and stored BIOS/UEFI settings while the computer is unplugged. If it dies, the system may lose the correct date and time or reset configuration on each boot. Replacing it is a simple, inexpensive fix.
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