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Remove the CMOS battery

Use this information to remove the CMOS battery.

The following tips describe information that you must consider when removing the CMOS battery.
  • Lenovo has designed this product with your safety in mind. The lithium CMOS battery must be handled correctly to avoid possible danger. If you replace the CMOS 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.
  • To order replacement batteries, call 1-800-IBM-SERV within the U.S., and 1-800-465-7999 or 1-800-465-6666 within Canada. Outside the U.S. and Canada, call your support center or business partner.
    After you replace the CMOS battery, you must reconfigure the server and reset the system date and time.
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.

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.
Before removing the CMOS battery:
  1. Remove the top cover. See Remove the top cover.

  2. Remove any parts and disconnect any cables that might impede your access to the CMOS battery.

To remove the CMOS battery, complete the following steps:

  1. Locate the CMOS battery. See System board components.
  2. Press the battery clip as shown and carefully lift CMOS battery out of the socket.
    • Failing to remove the CMOS battery properly might damage the socket on the system board. Any damage to the socket might require replacing the system board.

    • Do not tilt or push the CMOS battery by using excessive force.

    Figure 1. CMOS battery removal
    CMOS battery removal

After you finish
  1. Install a new one. See Install the CMOS battery.

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

  3. If you are instructed to return the component or optional device, follow all packaging instructions, and use any packaging materials for shipping that are supplied to you.

Demo video

Watch the procedure on YouTube