A Battery That Provides Power To The Cmos (Or Bios) Chip That Stores Cmos Settings. A Pc Must Retain Certain Settings When Its Turned Off And Its Power Cord Is Unplugged.

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1. A Battery That Provides Power To The Cmos (Or Bios) Chip That Stores Cmos Settings. A Pc Must Retain Certain Settings When Its Turned Off And Its Power Cord Is Unplugged.