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Install the CMOS battery (CR2032)

Use this information to install the CMOS battery (CR2032).

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 replacing the CMOS battery, make sure to reconfigure the server and reset system date and time.

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

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 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 the following section(s) to ensure that you work safely.
  • Touch the static-protective package that contains the component to any unpainted metal surface on the server; then, remove it from the package and place it on a static-protective surface.

  • Do not make CMOS battery in contact with a metal surface when replace it. The contact with metal surface, such as server side, can cause damage to the battery.

  • Make sure that all server power cords are disconnected from their power sources before performing this procedure.


Install the CMOS battery.
Figure 1. CMOS battery installation
CMOS battery installation
  1. Pivot the CMOS battery to insert it into the socket, with positive (+) side faces up.
  2. Press the battery straight down until it clicks in place.

After you finish

  1. Install the top cover. See Install the top cover.

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

  3. Reset date, time, and all the passwords.

Demo video

Watch the procedure on YouTube