CMOS Battery Guide for Motherboards
When your PC forgets the time and BIOS settings, the CMOS coin cell is usually the culprit. CR2032 covers about 90% of desktop and laptop motherboards.
What Is a CMOS Battery?
The CMOS battery keeps the system clock and BIOS configuration alive while the PC is unplugged. Most desktop motherboards use a CR2032 3V lithium coin cell on a holder.
Which Battery Should You Buy?
Look for a round cell holder on the board: standard desktops use CR2032; thin laptops may use CR1220 or CR2016. Match the printed voltage and size before ordering.
CMOS Battery by Brand
How to Replace a CMOS Battery
- Power off the PC and unplug it (and, for laptops, remove the battery).
- Locate the coin cell holder on the motherboard.
- Release the retention clip and push the cell out with a screwdriver tip.
- Insert the new cell, positive side up, and reboot — reset BIOS settings if prompted.
CMOS Battery FAQ
What is a CR2032 battery?
A CR2032 is a 20 mm × 3.2 mm 3V lithium coin cell with about 220 mAh capacity — the most common battery for car key fobs, PC motherboards, glucometers and remotes.
How long does a CR2032 last?
2–5 years in typical use, and 5+ years of shelf life when stored in a cool, dry place.
What is a CR1220 battery?
A 12.5 mm × 2.0 mm 3V lithium coin cell (~40 mAh) used in motherboards, remotes and small devices.
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