Dell Alienware M14x (Early 2011) - Manual (Page 75)

CHAPTER 4: INSTALLING AND REPLACING COMPONENTS
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To replace the battery pack:
Follow the the instructions in “Before You Begin” on page 1. 66.
Place the battery pack in the battery bay and tighten the two captive screws that secure 2.
the battery pack to the computer base.
Connect the battery pack cable to the connector on the system board.
3.
Align the tabs on the base cover with the slots on the computer base. 4.
Slide the base cover until it clicks into place. 5.
Tighten the two captive screws that secure the base cover to the computer base. 6.