iRobot DISCOVERY 400 - Manual (Page 14)

14 iRobot Roomba Owner’s Manual
Charging Lights
Roomba uses the CLEAN button light to indicate that it is charging.
Use the chart to determine that status of the battery.
CLEAN/Power
Indicator Light
Battery Status
Solid red Battery empty
Amber pulse Charging
Solid green Fully charged
Quick amber pulse 16-hour refresh charge
Charging Roomba
Charge Roomba by plugging the charger directly into Roomba’s battery
charger socket.
Or