Clean Roomba charging contacts in 6 steps: unplug, wipe and check
A model-specific guide for the contacts on Roomba Mini, 100/1000, Plus 400/500 and Max 700 series. Consult separate instructions for older models.
Dirty metal contacts can interrupt charging even when a robot reaches its dock. iRobot advises checking the listed newer series about monthly or when dirty. Never spray water or cleaner onto a powered dock.