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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 and Warranty 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. 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 stand. See "Replacing the computer stand" on page 96.
4. Remove the computer cover. See "Removing the computer cover" on page 101.
5. Remove the system-board shield. See "Replacing the system-board shield" on page 102.
6. Locate the coin-cell battery. See "Computer components" on page 33.
7. Remove the coin-cell battery as shown.
Figure 82. Removing the coin-cell battery
8. Install the new coin-cell battery as shown.
Figure 83. Installing the coin-cell battery
9. Install the system-board shield. See "Replacing the system-board shield" on page 102
10. Reinstall the computer cover and connect the cables. See "Completing the parts replacement" on
page 142.
11. Reinstall the computer stand. See "Replacing the computer stand" on page 96.
12. 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.
13. Use the Setup Utility program to set the date, time, and any passwords. See "Using the Setup Utility
program" on page 71.
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ThinkCentre M700z and M800z Hardware Maintenance Manual
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