Dell XPS 730 (Late 2008) - Manual (Page 96)

94 Replacing the Battery
5 Carefully press the battery release lever away from the battery and the
battery will pop out.
6 Remove the battery from the system and properly dispose of the battery.
7 Insert the new battery into the socket with the side labeled "+" facing up,
then snap the battery into place.
8 Replace the computer cover (see "Replacing the Computer Cover" on
page 17).
9 Connect your computer and devices to electrical outlets, and then turn
them on.
10 Enter system setup (see "System Setup" on page 97) and restore the
settings you recorded in step 1.
1 battery (positive side) 2 battery release lever
1
2