Acer Altos R920 Series - Manual (Page 114)

3 System upgrade 96
To remove the RAID BBU:
1 Perform the pre-installation instructions described on page 39.
2 Remove the processor air baffle. Perform instructions described in
“To remove the processor air baffle” section on page 45.
3 Remove the SAS module. Perform instructions described in “To
remove the SAS module” section on page 89.
4 Remove the three screws on the RAID BBU.
5 Remove the RAID BBU from the SAS module.
6 Observe the post-installation instructions described on page 40.