How to check PC motherboard battery status?

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The CMOS battery has its lifespan, it naturally degrades over time. To check the CMOS battery status on a computer, there are a few methods you can use:

1. Check BIOS/UEFI Settings

• Restart your computer and enter the BIOS or UEFI settings. (This usually involves pressing a key like DEL, F2, or F10 during startup. It varies by manufacturer.)
• Once in the BIOS, look for a setting related to the time and date. If the time and date are correct, the CMOS battery is likely still functioning.
• If the time and date reset each time you restart, the CMOS battery may be weak or dead.

2. Windows Command Prompt (Some PCs)

• On some systems, the wmic command can provide status information. Open Command Prompt and enter:
  wmic bios get name,serialnumber,smbiosbiosversion
• While this command doesn’t directly check the CMOS battery, a reset in the BIOS version or a serial number error after a shutdown may indicate CMOS battery issues.

3. Observe Symptoms of a Failing CMOS Battery

• Incorrect system date and time after reboot.
• BIOS settings reset to defaults after shutdown.
• Issues with hardware drivers or error messages on startup.

4. Use Hardware Diagnostic Software

• Some motherboard manufacturers or computer brands provide diagnostics tools that can check the CMOS battery's health.
• Tools like HWiNFO or AIDA64 can sometimes report CMOS battery voltage, but this feature depends on motherboard support.

5. Physically Check the Battery with a Voltmeter

If you are comfortable, you can open the computer case, locate the CMOS battery on the motherboard (usually a round CR2032 battery), and use a voltmeter to measure its voltage. A healthy CMOS battery typically reads around 3V; if it's significantly lower (e.g., around 2.5V or less), consider replacing it.

Each of these methods can help you determine if the CMOS battery needs replacement.