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Replacing the battery - ThinkCentre M90z

This section provides instructions on how to replace the battery.

Your computer has a special type of memory that maintains the date, time, and settings for built-in features, such as parallel-port assignments (configuration). A battery keeps the information active when you turn off the computer.

The battery normally requires no charging or maintenance throughout its life. However, if the battery fails, the date, time, and configuration information (including passwords) are lost. An error message will be displayed when you turn on the computer.

Refer to the Lithium battery notice in the Safety and Warranty Guide - ThinkCentre M90z for information about replacing and disposing of the battery.

To replace the battery, do the following:

  1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer.
  2. Place a soft, clean towel or cloth on the desk or surface. Hold the sides of your computer and gently lay it down so that the screen is against the surface and the cover is facing up.
  3. Remove the computer cover. See Removing the computer cover.
  4. Locate the battery on the system board. See System board part and connector locations.
  5. Remove the battery.

Removing the battery

  1. Install a new battery.

Installing a new battery

  1. Reinstall the computer cover and connect the cables. See Completing the parts replacement.

    Note: When the computer is turned on for the first time after replacing the battery, an error message might be displayed. This is normal after replacing the battery.

  2. Turn on the computer and all attached devices.
  3. Use the Setup Utility program to set the date, time, and any passwords


  • Alias ID: MIGR-75321
  • Document ID: HT037256
  • Last Updated :17 Jun 2014
  • (c) 2014 Lenovo