iRobot Roomba 500 Series - Manual (Page 11)

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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