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Install the CMOS battery (CR2032)

Follow 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 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.
  • Go over Installation Guidelines 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.

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


Place the CMOS battery on top of the socket with the positive (+) symbol facing up, and press the battery into the seat until it clicks in place.
Figure 1. Installing the CMOS battery

After this task is completed

  1. Proceed to complete the parts replacement (see Complete the parts replacement).

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