Remove the CMOS battery

Use this information to remove the CMOS battery.

To avoid possible danger, read and follow the following safety statement.
  • 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 that is 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 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.

Before you remove the CMOS battery:
  1. Read the following section(s) to ensure that you work safely.
  2. Turn off the corresponding compute node that you are going to perform the task on.

  3. Remove the compute node (see Remove a compute node from the enclosure).

  4. Remove the compute node cover (see Remove the compute node cover).

The following notes describe information that you must consider when replacing the battery.

Complete the following steps to remove the CMOS battery.

Watch the procedure. A video of the installation process is available:
Figure 1. CMOS battery removal
CMOS battery removal

  1. Remove the CMOS battery:
    1. Use a fingernail to press the top of the battery clip away from the battery. The battery pops up when it is released.
    2. Use your thumb and index finger to lift the battery from the socket.
      Attention: Do not lift the battery by using excessive force. Failing to remove the battery properly may damage the socket on the system board. Any damage to the socket may require replacing the system board.
  2. Dispose of the CMOS battery as required by local ordinances or regulations.

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.