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.

1. Remove the cover. See “Removing the cover” on page 114.
2. Locate the battery. See “Identifying parts on the system board” on page 116.
3. Depending on the location of the CMOS battery in the computer, you might
have to remove the drive bay assembly to access the battery. If necessary, see
“Removing and replacing the drive bay assembly” on page 118.
4. If necessary, remove any adapters that impede access to the battery. See
“Replacing a PCI adapter” on page 121 for more information.
5. Remove the old battery.
6. Install the new battery.
7. Replace the drive bay assembly if it was removed. See “Removing and
replacing the drive bay assembly” on page 118.
8. Replace any adapters that were removed to gain access to the battery. See
“Replacing a PCI adapter” on page 121 for more information.

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.

9. Go to “Completing the FRU replacement” on page 144.

122 Lenovo 3000 J Series