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Remove the CMOS battery (CR2032)

Follow instructions in this section to remove the CMOS battery (CR2032).

About this task

To avoid potential danger, read and follow the following safety statements.
  • S002
    disconnect all power
    The power-control button on the device and the power switch on the power supply do not turn off the electrical current supplied to the device. The device also might have more than one power cord. To remove all electrical current from the device, ensure that all power cords are disconnected from the power source.
  • S004

    When replacing the lithium battery, use only Lenovo specified part number or an equivalent type battery recommended by the manufacturer. If your system has a module containing a lithium battery, replace it only with the same module type made by the same manufacturer. The battery contains lithium and can explode if not properly used, handled, or disposed of.

    Do not:
    • Throw or immerse into water
    • Heat to more than 100°C (212°F)
    • Repair or disassemble

    Dispose of the battery as required by local ordinances or regulations.

  • S005
    The battery is a lithium ion battery. To avoid possible explosion, do not burn the battery. Exchange it only with the approved part. Recycle or discard the battery as instructed by local regulations.
Make sure to read the following notes carefully before replacing the CMOS battery in the server.
  • Read the Installation guidelines to ensure that you work safely.

  • Turn off the server and peripheral devices, and disconnect the power cords and all external cables (see Power off the server).

  • If the server is in a rack, remove it from the rack.

  • Remove any locking device that secures the server cover, such as a Kensington lock or a pad lock.

  • Do not make CMOS battery in contact with any metal surface during the replacement. Any contact with a metal surface can cause damages to the battery.

  • When replacing the battery, you must replace it with another CMOS battery of the exact same type (CR2032) made by the same manufacturer.

  • After you replace the battery, you must reconfigure the solution and reset the system date and time.


  1. Remove the server cover (see Remove the server cover).
  2. Locate the CMOS battery on the system board (see System-board components).
  3. Remove the CMOS battery.
    1. Gently push on one side of the battery until it leaves the socket.
    2. Lift the battery out of the socket with your thumb and index finger.
    Do not lift the battery with excessive force, as it may cause damages to the socket on the system board. Any damage to the socket may require replacing the system board.
    Figure 1. Removing the CMOS battery
    Removing the CMOS battery

After this task is completed

  1. Install a new CMOS battery. See Install the CMOS battery (CR2032).

  2. Dispose the component with compliance to local regulations.

Demo video

Watch the procedure on YouTube