What is a CMOS battery, and why is it necessary in desktop computers?

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A CMOS battery, also known as a motherboard battery, provides power to the CMOS chip on the motherboard, which stores BIOS settings, system configuration, and the real-time clock. The CMOS battery ensures that these settings are retained even when the computer is powered off, ensuring uninterrupted operation. Additionally, certain motherboard models like 813195-b21 may require specific CMOS batteries for optimal performance and functionality.