Dell Inspiron 13z (N311z, Mid 2011) - Manual (Page 16)

16 Module Cover
Replacing the Module Cover
1 Follow the instructions in "Before You Begin" on page 9.
2 Align the tabs on the module cover into the slots on the computer base
and gently snap the module cover into place.
3 Tighten the captive screw that secures the module cover to the computer
base.
4 Replace the battery. See "Replacing the Battery" on page 14.
1 screw 2 module cover
1
2