Underwater cleaner

An underwater cleaner, in particular for a swimming pool, with a housing in which a battery-powered pump with an electric motor and an impeller rotatable about an impeller axis of rotation is arranged, with a suction nozzle—defining a suction plane—formed by the housing, and a flow channel which is arranged in the housing and accommodates the impeller, is designed to be inclined with respect to the suction plane and which extends between an inlet opening arranged at or adjacent to the suction nozzle and an outlet opening, wherein a receptacle for a filter device is arranged at or adjacent to the outlet opening, and wherein the housing together with the suction nozzle can be manufactured by injection molding and the flow channel can be molded by a slider which can be pulled in the longitudinal direction of the flow channel, wherein the flow channel—at least at or adjacent to the outlet opening—is designed to be inclined with respect to a line normal to the suction plane, wherein at least one reference line formed by a feature selected from the group consisting of a channel center axis of the flow channel and a surface line of the flow channel encloses an acute first angle with the suction plane at least at or adjacent to the outlet opening, wherein the impeller axis of rotation is arranged eccentrically in the flow channel, wherein an eccentricity measured between the impeller axis of rotation and the channel center axis is at most 10% of the largest diameter of the flow channel.