Dell XPS 14 (L421X, Mid 2012) - Manual (Page 14)

7 Lift the connector latch and using the pull-tab, disconnect the battery-LED-board
cable from the system-board.
1
4
3
2
5
1 connector latch 2 pull-tab
3 battery-LED-board cable 4 base-cover assembly
5 battery-LED board
8 Remove the battery-LED board from the base-cover assembly.
See "Removing the Battery-LED Board" on page 19.
14 | Removing the Base Cover