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Install the CMOS battery (CR2032)

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

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

Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.
The following notes describe information that you must consider when you are replacing the CMOS battery in the server:
  • You must replace the CMOS battery with a lithium CMOS battery of the same type from the same manufacturer.
  • After you replace the CMOS battery, you must reconfigure the server and reset the system date and time.


  1. Follow any special handling and installation instructions that come with the CMOS battery.
    Touching the CMOS battery on a metal surface, such as the side of the server, when you replace the CMOS battery can cause it to fail.
  2. Locate the CMOS battery socket on the system board assembly.
    Figure 1. CMOS battery socket location
    CMOS battery socket location
    1 CMOS battery socket
  3. Orient the CMOS battery so that the positive (+) side faces upward.
  4. Install the CMOS battery.
    1. Tilt the CMOS battery and insert it to the positive end on the socket, and make sure that the CMOS battery goes tight to the metal clip.
    2. Press the CMOS battery down until it clicks into the socket.
      Figure 2. CMOS battery installation
      CMOS battery installation

After you finish

  1. Reinstall the fan cage. See Install the fan cage.
  2. Reinstall the fans. See Install a fan.
  3. Complete the parts replacement. See Complete the parts replacement.
  4. Reconfigure the server and reset the system date and time.

Demo video

Watch the procedure on YouTube