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Remove the CMOS battery (CR2032)

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

About this task

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.
  • Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

  • Power off the server and disconnect all power cords for this task. See Power off the server.

  • Prevent exposure to static electricity, which might lead to system halt and loss of data, by keeping static-sensitive components in their static-protective packages until installation, and handling these devices with an electrostatic-discharge wrist strap or other grounding system.

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

  • If foot stands are installed on the server, pivot them inwards and lay the server on its side for easier operation.


  1. Make preparations for this task.
    1. Remove the server cover. See Remove the server cover.
    2. If necessary, remove all flash power modules. See Remove a flash power module.
    3. Remove the air baffle. See Remove the air baffle.
    4. Remove the A2/L4 GPU air duct, if any. See Remove an A2/L4 GPU air duct.
    5. Disconnect cables for PCIe adapter or full-length GPU adapter.
    6. Remove all the PCIe adapters. See Remove a HL PCIe adapter.
    7. Remove all the full-length GPU adapters, if any. See Remove a FL GPU adapter.
  2. Locate the CMOS battery on the system board. See System board connectors.
  3. Remove the CMOS battery.
    1. Press on the nub on the side of the CMOS battery.
    2. Pivot the battery away from the socket to remove it.
    Do not apply excessive force on the CMOS battery. 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.
    Figure 1. Removal of a CMOS battery
    Removing the CMOS battery

After this task is completed

  1. Install a replacement unit. See Install a CMOS battery (CR2032).

  2. Dispose the component with compliance to local regulations.