HP Compaq NC4010 Maintenance And Service Manual page 26

Product Description
Component
Item
7 Memory expansion
compartment
8 Battery release latch
9 Battery bay
1–20
Bottom Components (Continued)
Table 1-7
Function
Contains 1 memory expansion slot
for optional memory modules.
Releases the primary battery pack
from the battery bay.
Holds the primary battery pack.
Maintenance and Service Guide