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Remove the CMOS battery (CR2032)

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

  • Lenovo has designed this product with your safety in mind. The lithium battery must be handled correctly to avoid possible danger. If you replace the battery, you must adhere to the following instructions.
  • If you replace the original lithium battery with a heavy-metal battery or a battery with heavy-metal components, be aware of the following environmental consideration. Batteries and accumulators that contain heavy metals must not be disposed of with normal domestic waste. They will be taken back free of charge by the manufacturer, distributor, or representative, to be recycled or disposed of in a proper manner.
  • After you replace the battery, you must reconfigure the server and reset the system date and time.
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 of 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



  1. Make preparation for this task.
    1. Remove the front top cover. See Remove the front top cover.
    2. Remove all of the fans. See Remove a fan.
    3. Remove the fan cage. See Remove the fan cage.
    4. Remove the front air baffle. See Remove the front air baffle.
  2. Locate the CMOS battery on the system board assembly.
    Figure 1. CMOS battery location
    CMOS battery location
    1 CMOS battery
  3. Differentiate between the positive and negative sides of the CMOS battery.
    Figure 2. Positive (+) and negative (-) sides of the CMOS battery
    Positive (+) and negative (-) sides of the CMOS battery
  4. Remove the CMOS battery.
    • Failing to remove the CMOS battery properly might damage the socket on the system board assembly. Any damage to the socket might require replacing the system board assembly.
    • Do not tilt or push the CMOS battery by using excessive force.
    1. From the negative end, lever the CMOS battery from the socket with a slotted screwdriver.
    2. Remove the CMOS battery out of the socket.
      Figure 3. CMOS battery removal
      CMOS battery removal

After you finish

Dispose the component with compliance to local regulations.

Demo video

Watch the procedure on YouTube