Lenovo 6491 - Manual (Page 44)

Accessing system board components
You might need to remove the drive bay assembly to access system board
components such as memory, the battery, and CMOS.
To access system board components and the drives:
1. Remove the computer cover. See “Removing the cover” on page 22.
2. Remove the front bezel by releasing the three tabs and pivoting the bezel
forward to remove completely.
3. In some models, you might have to remove the PCI adapter in order to gain
access to the battery.
24 User Guide