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Install the CMOS battery (CR2032)

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

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.

Before you install the CMOS battery, complete the following steps:
  1. Read the following sections to ensure that you work safely.
  2. Turn off the server. Disconnect the power cords and all external cables (see Power off the server).

  3. Locate the CMOS battery on the system board.

    Figure 1. CMOS battery location
    CMOS battery location
    1 CMOS battery
  4. 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.

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 (CR2032).
  • To operate the system in high temperature environment, it is recommended to use CMOS (CR2032HR).
  • After you replace the CMOS battery, you must reconfigure the server and reset the system date and time.
  • Dispose of the battery as required by local ordinances or regulations.
  • 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.


  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.
    Figure 2. CMOS battery installation
    CMOS battery installation
After you install the CMOS battery, complete the following steps:
  1. Install the node if needed (see Install a node).

  2. Reconnect power cords and all external cables.

  3. For models with Security Pack Enabled, when the CMOS battery is replaced, the system will enter the system lockdown mode. Reactivation is required to unlock the system (see Activate the system).

Demo video