Why the BIOS Battery Matters

Is your computer forgetting the time and date? Are BIOS settings constantly resetting? 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.

Symptoms of a Failing BIOS Battery

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.

What You’ll Need

A replacement CMOS battery (typically CR2032)

A small Phillips screwdriver

Anti-static wrist strap (optional, but recommended)

A 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 Know It Worked

Your PC remembers the correct time and date

No more BIOS or CMOS-related errors

The boot process is smoother

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.

If this article still doesn't help your laptop battery, you can buy a new battery at BatteryMall.com.

If you want to learn more about batteries, please visit:BatteryMall.com/blogs/support