The lithium coin-cell battery installed to the circular slot on the ASUS A8N-SLI motherboard provides power to the complementary metal-oxide semiconductor (CMOS) -- also called the CMOS RAM -- and the real-time clock. The CMOS is a chip on the motherboard that stores configuration data, like device boot order and power options.
Most batteries last several years, but if the computer displays a message like "CMOS Checksum Error" when booting, or if the motherboard forgets the CMOS settings or the date and time each time the PC is turned on, the battery most likely needs to be removed and replaced.
- Skill level:
- Moderately Easy
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Things you need
- Phillips head screwdriver
Turn off the computer. Disconnect the power connector from the rear of the computer case.
Use a Phillips head screwdriver to loosen and remove the screws that attach the cover to the computer case.
Slide the cover off of the case. Touch the chassis to dispel any build-up of static electricity.
Set the computer on its side so that the bottom of the motherboard is parallel with the floor.
Find the lithium cell CMOS battery, located to the right of the PCI slots, to the left of the SATA slots, and just below the "ASUS" tag.
Push down on the lever holding the CMOS battery in place. Use your thumb and index finger to extract the lithium coin-cell battery from the Asus A8N-SLI motherboard.
Tips and warnings
- If you intend to replace the battery, you must purchase a compatible model and install the battery in the exact way you found it.
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