Completing The Parts Replacement - Lenovo ThinkCentre M800 User Manual

The coin-cell battery normally requires no charging or maintenance throughout its life; however, no coin-cell
battery lasts forever. If the coin-cell battery fails, the date, time, and configuration information (including
passwords) are lost. An error message is displayed when you turn on the computer.
Refer to the "Lithium coin-cell battery notice" in the Safety, Warranty, and Setup Guide for information about
replacing and disposing of the coin-cell battery.
To replace the coin-cell battery, do the following:
1. Remove any media from the drives and turn off all connected devices and the computer. Then,
disconnect all power cords from electrical outlets and disconnect all cables that are connected to the
computer.
2. Remove the computer cover. See "Removing the computer cover" on page 52.
3. Locate the coin-cell battery. See "Computer components" on page 4.
4. Remove the coin-cell battery as shown.
Figure 42. Removing the coin-cell battery
5. Install the new coin-cell battery as shown.
Figure 43. Installing the coin-cell battery
6. Reinstall the computer cover and connect the cables. See "Completing the parts replacement" on
page 74.
7. Turn on the computer and all connected devices.
Note: When the computer is turned on for the first time after replacing the coin-cell battery, an error
message might be displayed. This is normal after replacing the coin-cell battery.
8. Use the Setup Utility program to set the date, time, and any passwords. See "Using the Setup Utility
program" on page 33.

Completing the parts replacement

After completing the installation or replacement for all parts, reinstall the computer cover and reconnect
cables. Depending on the parts you installed or replaced, you might need to confirm the updated information
in the Setup Utility program. Refer to "Using the Setup Utility program" on page 33.
To reinstall the computer cover and reconnect cables to your computer, do the following:
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ThinkCentre M800 and M900 User Guide