Lenovo ThinkCentre M900z 10F2 Hardware Maintenance Manual page 117

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 back cover. See "Removing the back cover" on page 90.
3. Remove the computer cover. See "Replacing the computer cover" on page 95.
4. Remove the system board shield. See "Replacing the system board shield" on page 98.
5. Locate the coin-cell battery. See "Major FRUs and CRUs" on page 31.
6. Remove the coin-cell battery as shown.
Figure 45. Removing the coin-cell battery
7. Install the new coin-cell battery as shown.
Figure 46. Installing the coin-cell battery
8. Reinstall the system board shield. See "Replacing the system board shield" on page 98.
9. Reinstall the computer cover. See "Replacing the computer cover" on page 95.
10. Reinstall the back cover and reconnect cables to your computer. See "Completing the parts
replacement" on page 116.
11. 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.
12. Use the Setup Utility program to set the date, time, and any passwords. See "Using the Setup Utility
program" on page 63.
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Chapter 9 Installing or replacing hardware
109