iRobot Roomba Owner's Manual page 28

Unscrew the four screws shown below and remove Roomba's bottom
3
cover.
Remove Roomba's battery.
4
Reinstall Roomba's battery with the iRobot logo facing up.
5
Replace Roomba's bottom cover and the four screws.
6
Replace Roomba's side brush and the side brush screw.
7
28 iRobot Roomba 600 Series