iRobot Roomba Professional Series - Manual (Page 12)

12 iRobot Roomba Professional Series
CLEAN button light What it means
Red Battery empty
Amber pulsing Charging
Green solid Fully charged
Amber flashing 16-hour refresh charge
TIP: When Roomba is on the Home Base, always make sure that the Home
Base Power and Docked lights are on.
Or
Charging Roomba
Charge Roomba in one of two ways:
Roomba uses the CLEAN button light to indicate that it is charging. Use
this chart to determine the status of the battery:
CLEAN Button
Light
Using the Home Base Using the Power Supply Only