Replacing the CMOS battery
Attention
Do not open your computer or attempt any repair before reading and understanding the
“Important safety information” in the ThinkCentre Safety and Warranty Guide that came with
your computer. To obtain a copy of the ThinkCentre Safety and Warranty Guide, go to:
http://www.lenovo.com/support
This section provides instructions on how to replace the CMOS battery.
If the CMOS battery fails, the date, time, and configuration information (including
passwords) are lost. An error message is displayed when you turn on the
computer.
Important
Refer to “Safety notices (multi-lingual translations)” on page 7 for information
about replacing and disposing of the battery.
CAUTION:
When replacing the lithium battery, use only Part Number 33F8354 or an
equivalent type battery recommended by the manufacturer.
To replace the CMOS battery:
1. Remove the computer cover. See “Removing the computer cover” on page 87.
2. Locate the battery. See “Locating parts on the system board” on page 89.
3. You might have to remove any PCI adapters that impede access to the battery.
4. Remove the old battery.
5. Install the new battery.
6. Replace any PCI adapters that were removed.
Note: When the computer is turned on for the first time after battery
replacement, an error message might be displayed. This is normal after
replacing the battery.
7. Go to “Completing the FRU replacement” on page 114.
Chapter 8. Replacing FRUs - Tower Computers 113
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