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Install the CMOS battery (CR2032)

Follow the instructions in this section to install the CMOS battery.

About this task

  • When replacing the CMOS battery, you must replace it with another 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.
  • To avoid possible danger, read and follow the following safety statement.
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 peripheral devices and disconnect the power cords and all external cables. 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 installed in a rack, slide the server out on its rack slide rails to gain access to the top covers, or remove the server from the rack. See Remove the server from rails.

Follow any special handling and installation instructions that come with the replacement battery.


  1. Locate the CMOS battery on the system board assembly.
    Figure 1. CMOS battery location
    CMOS battery location
  2. Touch the static-protective package that contains the new part to any unpainted surface on the outside of the server; then, take the new part out of the package and place it on a static-protective surface.
  3. Install the CMOS battery. Ensure that the CMOS battery is seated in place.
    Before you install the battery into the socket, make sure that the positive side faces upward.
    Figure 2. CMOS battery installation
    CMOS battery installation
    1. Tilt the battery and insert it to the positive end on the socket, and make sure that the battery goes tight to the metal clip.
    2. Press the battery down until it clicks into the socket.

After you finish

  1. Reinstall the front top cover. See Install the front top cover.

  2. Complete the parts replacement. See Complete the parts replacement.

  3. Use the Setup utility to set the date, time, and any passwords.
    After you install the CMOS battery, you must reconfigure the server and reset the system date and time.

Demo video

Watch the procedure on YouTube