Dell XPS 15 (L521X, Mid 2012) - Manual (Page 39)

3 Peel the mylar from the coin-cell battery.
4 Disconnect the coin-cell-battery cable from the system board.
5 Note the coin-cell battery-cable routing and remove the cable from the
optical-drive bracket.
6 Peel the coin-cell battery from the palm-rest assembly.
7 Lift the coin-cell battery and remove it from the tab on the keyboard bracket.
5
4
3
2
1
1 mylar 2 tab
3 coin-cell battery 4 coin-cell battery cable
5 routing guide
Removing the Coin-Cell Battery | 39