iRobot ROOMBA 5107 Owner's Manual page 12

Charging lights
All Roomba models have a charging indicator light. Use this chart to
determine the status of the battery:
Model 10
TIP: when roomba is on the Home Base, always make sure that the Home Base
Power and Docked lights are on.
12
iRobot Roomba Owner's Manual
Charging Indicator light
Red
Amber pulse
Solid green
Charging
Indicator
Light
Battery status
Battery empty
Charging
Fully charged
Model 20
Charging
Indicator
Light