HP Pavilion Maintenance And Service Manual page 44

2. Remove the seven M2.0x6 screws (1) in the battery bay and on the bottom.
3. Remove the two M2.5x6.5 screws (2) on the bottom, and then lift the base enclosure (3) to remove it.
Reverse the removal procedures to install the base enclosure.
34 Chapter 6 Removal and replacement procedures for authorized service provider parts