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Install the CMOS battery (CR2032)

Consider the following when replacing the CMOS battery in the server:

  • 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, make sure to read and follow the safety statements.

  • Lenovo has designed this product with your safety in mind. The CMOS battery must be handled correctly to avoid possible danger. If you install the CMOS battery, do adhere to the following instructions.
    In the U. S., call 1-800-IBM-4333 for information about battery disposal.
  • If you replace the original CMOS battery with a heavy-metal battery or a battery with heavy-metal components, be aware of the following environmental consideration. Batteries and accumulators that contain heavy metals must not be disposed of along with normal domestic waste. They should be taken back free of charge by for recycle or proper disposal by the manufacturer, distributor, or representatives.

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.

About this task

  • Read Safety inspection checklist and 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.

Watch the procedure
  • A video of this procedure is available at YouTube.


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
Installing the CMOS battery
After you finish

Reset date, time, and all the passwords.