The present invention relates to a mixer feeder (1) comprising a chassis (3) and a mixing tub (10) arranged thereon with at least one mixing element for mixing cattle feed, an electric motor connected to the at least one mixing element, storage means such as batteries connected to the electric motor for storage and generation of electrical energy to the electric motor, wherein the chassis is constructed from at least one chassis beam with an inner space in which the energy storage means are received. The invention also relates to a method for performing maintenance on such a mixer feeder.
