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How to Replace the Battery on a Dell Dimension Desktop

Updated February 21, 2017

The battery in your Dell Dimension desktop computer is the CMOS battery. The CMOS battery is what supplies power to your motherboard when your computer is turned off. Your CMOS battery makes it possible for your computer to retain the BIOS settings and time clock when your computer is not connected to an additional power source. Your CMOS battery looks like a large watch battery.

Turn off your computer and remove the power cord and any other peripheral components.

Remove the side of your computer case by removing the two screws on the back of your computer.

Locate the CMOS battery on your motherboard. It will look like a large, silver watch battery.

Grab the edge of the battery and gently pry it out of its chamber.

Place a new CMOS battery into the battery chamber, then replace the side of your computer case.

Things You'll Need

  • CMOS battery
  • Phillips head screwdriver
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About the Author

T.M. Wit was born and raised in Cleveland Ohio. He has advanced studies in mathematics, probability, business and economics. When he's not freelance writing he enjoys golfing, bowling and poker. He has worked in information systems in Asia and the United States.