Dell Inspiron 14 (3420, Mid 2012) - Manual (Page 44)

4
3
2
1
1 battery socket 2 coin-cell battery
3 coin-cell battery cable 4 audio-board cable
For Inspiron M4040:
a Using a plastic scribe, gently pry the coin-cell out of the battery socket
on the system board.
b Lift the coin-cell battery out of the battery socket on the system
board.
1
2
Coin-Cell Battery 44