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Install the CMOS battery (CR2032)

Use this information to install the CMOS battery.

About this task

To avoid possible danger, read and follow the following safety statement.
  • S004

    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.

  • S005
    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 the following sections to ensure that you work safely.
  • The following notes describe information that you must consider when replacing the system battery in the node.

    • When replacing the system battery, you must replace it with a lithium battery of the same type from the same manufacturer.
    • After you replace the system-board battery, you must reconfigure the node and reset the system date and time.
    • To avoid possible danger, read and follow the following safety statement.
Figure 1. CMOS battery location
CMOS battery location
Table 1. CMOS battery location
1 CMOS battery 


  1. Follow any special handling and installation instructions that come with the CMOS battery.
  2. Insert the new CMOS battery:
    1. Face the positive (+) symbol to the center of the node; then, place the battery into the seat until it clicks in place.
    2. As you slide the CMOS battery into place, press the top of the CMOS battery into the socket. Make sure that the battery clip holds the battery securely.
      Figure 2. CMOS battery installation
      CMOS battery installation
After you finish
  1. Reinstall the PCIe riser-cage assembly (see Install a PCIe riser assembly).

  2. Reinstall the tray cover (see Install the tray cover).

  3. Reinstall the tray (see Install a DWC tray in the enclosure).

    For safety, use the lift tool to install the tray into the rack.
  4. Connect all required external cables to the enclosure.
    Use extra forces to connect QSFP cables to the enclosure if Mellanox ConnectX-6 adapters are installed.
  5. Check the power LED on each node to make sure it changes from fast blink to slow blink to indicate all nodes are ready to be powered on.

Demo video

Watch the procedure on YouTube