How long does a PC CMOS battery last?

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The CMOS battery, a small coin-cell lithium battery located on your PC's motherboard, powers the Complementary Metal-Oxide-Semiconductor (CMOS) chip. This chip stores BIOS (Basic Input/Output System) settings, which control essential startup functions, such as time and date, hardware configurations, and system preferences. The lifespan of a CMOS battery can vary widely, but it generally lasts between 5 and 10 years, depending on usage, battery quality, and other environmental factors.

Typical Lifespan of a CMOS Battery

Most CMOS batteries last around 5-7 years. However, some users report lifespans reaching up to a decade, especially in desktops, where the system is plugged in most of the time. Desktops rely on the main power source more often, while laptops switch more frequently to CMOS battery power due to mobility. Factors like the frequency of power cycles (turning the system on and off) and the age of the motherboard can also impact the battery's longevity.

Signs That Your CMOS Battery Is Dying

When the CMOS battery begins to fail, several symptoms will become apparent:

• Incorrect System Time and Date: If your computer repeatedly resets the time and date after being turned off, this is one of the first signs of a weak CMOS battery.
• BIOS Settings Reset: The BIOS will revert to its default settings if the CMOS battery no longer holds power. This can include boot order settings, hardware configurations, and any custom preferences you’ve saved. Extending reading: How to access BIOS in Windows?
• Boot Errors: A low CMOS battery can lead to boot errors, such as messages stating "CMOS Checksum Error" or "CMOS Read Error," which may appear on startup.
• Slower Performance: In some cases, the system may take longer to boot or show degraded performance due to repeated resetting of BIOS settings.
• Failed Hardware Recognition: Some computers may fail to recognize specific hardware components when the CMOS battery is dead, particularly those configured via BIOS.

Why Do CMOS Batteries Wear Out?

CMOS batteries naturally degrade over time, just like any other battery. They discharge gradually, whether the PC is in use or not. Additionally, environmental factors such as high temperatures or humidity levels can speed up the battery's degradation. Systems that experience frequent power outages may also see a faster depletion of their CMOS battery. You will need to replace the CMOS battery while it can't meet the need of your computer.

Final Tips for CMOS Battery Care

To maximize your CMOS battery’s life, try to keep your computer in a cool, dry environment, and avoid leaving it unplugged for extended periods, especially with desktop computers. If your computer shows any signs of a weak battery, replacing it is inexpensive and can prevent potential issues. A new CMOS battery costs just a few dollars and can save you from the inconvenience of reconfiguring settings every time you start your computer.