Abstract: A robotic cleaner may include one or more driven wheels, at least one environmental sensor, and a mop module. The mop module may include a tank having a tank inlet and a tank outlet, a pad coupled at a bottom side of the tank, the pad configured to contact a surface to be cleaned and to receive liquid from the tank outlet, and a latch configured to transition between a latched position, a release position, and a refill position. When in the latched position and in the release position, at least a portion of the latch may extend over the tank inlet and, when in the refill position, the latch may be displaced from the tank inlet, exposing the tank inlet.