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Your computer has a special type of memory that maintains the date, time, and settings for built-in features,
such as parallel-connector assignments (configuration). A coin-cell battery keeps this information active
when you turn off the computer.
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 56.
3. Locate the coin-cell battery. See "Computer components" on page 5 .
4. Remove the coin-cell battery as shown.
Figure 19. Removing the coin-cell battery
5. Install the new coin-cell battery as shown.
Figure 20. Installing the coin-cell battery
6. Reinstall the computer cover and connect the cables. See "Completing the parts replacement" on
page 76.
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 35.
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ThinkCentre M73p User Guide
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