Dell P28S Owner's Manual page 11

I I nstalling 3-cell battery
1 Insert the battery into the slot on the computer.
2 Route the battery cable through the routing clip and connect the battery cable to the connector on the system board.
NOTE: Route the battery cable, if the cable at the base of the battery is un-routed.
3 Replace the M2 x 5 screw to secure the battery to the computer.
4 Install the base cover
5 Follow the procedure in
Removing 4-cell battery
1 Follow the procedure in
2 Remove the base cover.
3 To remove the battery:
a Disconnect the battery cable from the connector on the system board [1].
b Remove the M2 x 5 screw (2) that secure the battery to the computer[2].
c Lift the battery from the computer [3].
After working inside your computer.
Before working inside your computer.
Removing and installing components 11