Lenovo CMOS Battery Orginal

Description

The CMOS battery in a Lenovo laptop or desktop (or any computer) is responsible for powering the CMOS (Complementary Metal-Oxide-Semiconductor) chip, which stores important system information such as the date, time, and hardware settings when the computer is turned off or unplugged. This battery is typically a small CR2032 coin cell battery.

Common Symptoms of a Failing CMOS Battery:

• Incorrect system time and date: The most common sign that the CMOS battery is failing is that the computer loses track of time and resets the date to a default (e.g., January 1, 2000) every time it is powered off or restarted.
• Error messages at startup: You might see error messages such as:
  • “CMOS checksum error”
  • “CMOS battery failure”
  • “Date and time not set”
• Issues with BIOS settings: The system may lose custom BIOS settings (such as boot order or security settings) every time you turn the computer off.

Replacing the CMOS Battery:

1. Power off the computer and unplug it from any power source.
2. If it’s a laptop, remove the battery (if it’s removable), and disconnect any peripheral devices.
3. If it’s a desktop, ensure the computer is powered down and unplugged.
4. Open the computer’s case (for a desktop) or bottom panel (for a laptop).
5. Locate the CMOS battery (usually a CR2032 coin cell).
6. Carefully remove the old battery and replace it with a new one, ensuring it’s inserted with the correct orientation (the “+” side facing up).
7. Once the new battery is installed, close the case or panel and reconnect the power.
8. Power up the computer and enter the BIOS settings (usually by pressing a key like F2, Delete, or F12 during startup).
9. Set the correct time and date in the BIOS, and save the changes.

After replacing the CMOS battery, your system should resume functioning normally, with the correct time and date retained even when the system is turned off.

Let me know if you need specific instructions for your Lenovo model!