Lenovo 3000 7812, Hardware Maintenance Manual, Page: 100 / 256

Replacing 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.
This procedure describes how to remove and replace the CMOS battery.
1. Remove the cover. See “Removing the cover” on page 85.
2.
Locate the battery. See the system board illustration for your machine type at
“Locating parts on the system board” on page 87.
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 120.
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Hardware Maintenance Manual