Why the BIOS Battery Matters
Is your computer suddenly forgetting the time and date? Are you seeing boot errors or unexpected BIOS setting resets? These are all common symptoms of a failing BIOS battery (also called the CMOS battery). In this guide, we’ll walk you through how to replace a BIOS battery, troubleshoot CMOS battery failure, and fix boot issues — step by step.
You might be facing a BIOS battery failure. The BIOS (or CMOS) battery powers a tiny chip on your motherboard that stores essential settings, even when the PC is turned off.
In this guide, we’ll show you how to fix or replace a BIOS battery, step by step. It’s easier than you think, and with just a screwdriver and a new battery, you can get your system back on track.
Common CMOS Battery Failure Symptoms
The computer clock resets every time you restart
BIOS/UEFI settings keep reverting
Boot errors like “CMOS Checksum Error”
Slow startup or beeping noises
Pro Tip: If your PC is more than 3–5 years old, it's a good idea to check the CMOS battery.
Tools Needed to Replace a BIOS Battery
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A new CMOS/BIOS battery (most commonly CR2032)
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Small Phillips screwdriver
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Anti-static wrist strap (optional, but helps prevent damage)
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Clean, static-free workspace
How to Replace the BIOS Battery
1. Shut Down and Unplug the Computer
Safety first! Turn off your computer and disconnect all cables, especially the power cord.
2. Open the Computer Case
Use your screwdriver to remove the side panel of your desktop or the access panel on your laptop.
3. Locate the CMOS Battery
Look for a small silver coin-cell battery on the motherboard (usually labeled “CR2032”).
4. Remove the Old Battery
Use your fingers or a plastic tool to gently pop the battery out. Avoid metal tools to prevent short-circuits.
5. Insert the New Battery
Place the new battery in the same orientation (usually positive side up). Push it in until it clicks.
6. Reassemble and Power On
Reattach the case, plug everything back in, and power it on. You may need to reconfigure BIOS settings (like boot order or time/date).
How to Confirm Your BIOS Battery Replacement Was Successful
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Your PC now keeps the correct time and date
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No more CMOS-related errors during boot
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Faster startup and no unexpected resets
FAQs: BIOS Battery Repair
Q: Can I recharge a BIOS battery?
A: No, most CMOS batteries are not rechargeable. Replace with a new one.
Q: How long does a CMOS battery last?
A: Typically 3–5 years under normal conditions.
Q: Is it safe to do this myself?
A: Yes! As long as you follow safety steps and avoid static electricity.
Still having issues after trying these steps? You may need a new BIOS/CMOS battery.
Want to learn more about battery care and troubleshooting? Visit our batterymall.com/blogs/support
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