Battery charger for electric or hybrid motor vehicles, comprising: - at least one container body installable on a motor vehicle and defining at least one housing compartment; - at least one electronic appliance housed inside said housing compartment, connectable to at least one electric battery of said motor vehicle and configured to recharge said battery; - at least one closing body of said container body associated in a removable manner with the latter to close said housing compartment, said closing body being adapted to protect said electronic appliance housed inside said housing compartment; wherein said closing body comprises reinforcing means which are shaped and arranged so as to prevent the deformation of the closing body itself; wherein said reinforcing means comprise at least one reinforcing element made on at least one portion of said closing body; wherein: - said reinforcing element is of rectilinear shape; - said reinforcing means comprise a plurality of reinforcing elements made on at least one portion of said closing body; - at least one of said reinforcing elements is arranged substantially parallel to another of said reinforcing elements; characterized in that: - at least one of said reinforcing elements is arranged substantially transverse to another of said reinforcing elements; - said reinforcing elements comprise at least one cross section of concave shape defining drainage channels for liquids. - at least one container body installable on a motor vehicle and defining at least one housing compartment; - at least one electronic appliance housed inside said housing compartment, connectable to at least one electric battery of said motor vehicle and configured to recharge said battery; - at least one closing body of said container body associated in a removable manner with the latter to close said housing compartment, said closing body being adapted to protect said electronic appliance housed inside said housing compartment; wherein said closing body comprises reinforcing means which are shaped and arranged so as to prevent the deformation of the closing body itself; wherein said reinforcing means comprise at least one reinforcing element made on at least one portion of said closing body; wherein: - said reinforcing element is of rectilinear shape; - said reinforcing means comprise a plurality of reinforcing elements made on at least one portion of said closing body; - at least one of said reinforcing elements is arranged substantially parallel to another of said reinforcing elements; - said reinforcing element is of rectilinear shape; - said reinforcing means comprise a plurality of reinforcing elements made on at least one portion of said closing body; - at least one of said reinforcing elements is arranged substantially parallel to another of said reinforcing elements; characterized in that: - at least one of said reinforcing elements is arranged substantially transverse to another of said reinforcing elements; - said reinforcing elements comprise at least one cross section of concave shape defining drainage channels for liquids. - at least one of said reinforcing elements is arranged substantially transverse to another of said reinforcing elements; - said reinforcing elements comprise at least one cross section of concave shape defining drainage channels for liquids.