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Remove the CMOS battery (CR2032)

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.

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.

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.

About this task

Watch the procedure
  • A video of this procedure is available at YouTube.


  1. Make preparation for the task.
    1. Remove the server cover, see Remove the server cover.

      The heat sink and processor could be very hot. To avoid burning yourself, wait for a few minutes after turning off the server before you remove the server cover.

  2. Locate the CMOS battery on the system board. See System board components.
  3. Gently press on the nub on the side of the CMOS battery as illustrated; then, pivot the battery away from the seat to remove it.
    Avoid excessive force on the CMOS battery, as it might damage the socket on the system board and result in system board replacement.
    Figure 1. Removing the CMOS battery (CR2032)
    Removing the CMOS battery (CR2032)
After you finish
  1. Install a new CMOS battery. See Install the CMOS battery (CR2032).

    Make sure to install the CMOS battery before powering on the server. Otherwise, it might cause system abnormality.
  2. Dispose the CMOS battery as required by local ordinances or regulations.