A road vehicle provided with an electric motor configured to at least partially propel the road vehicle, a vehicle battery at least comprising a first and a second battery modules (2,3), each battery module comprising battery packs configured to at least partially power the electric motor, and a chassis comprising a first elongate chassis beam and a second elongate chassis beam, both extending along a length of the road vehicle, each first and second elongate chassis beam comprising an inner surface (6A, 7A) and an outer surface (6B, 7B), the inner surfaces of the first and second chassis beams facing each other, the outer surfaces of the first and second chassis beams facing away from each other, and at least one cross connecting the first elongate chassis beam and the second elongate chassis beam, wherein the first battery module and the second battery module are arranged on an outer surface of the first and second elongate chassis beam, respectively; wherein the road vehicle further comprises a battery mounting system for mounting the vehicle battery to the chassis, the battery mounting system for each of the first and second battery module comprises: - a battery box configured to hold and support the battery packs of the battery module; - a front bracket mounted to and projecting from the outer surface of the respective elongate chassis beam; and - a posterior bracket mounted to and projecting from the outer surface of the respective elongate chassis beam such that the posterior bracket is spaced apart from the front bracket for receiving the respective battery box between the front bracket and the posterior bracket; the battery mounting system further comprises an elongated cross member which is connected between the front brackets on a respective side of the first and second elongate chassis beams and an elongated cross member which is connected between the posterior brackets on a respective side of the first and second elongate chassis beams, characterized in that at least one elongated cross member comprises a first inner chassis beam attachment portion for connecting the elongated cross member to an inner side of the first elongate chassis beam and a second inner chassis beam attachment portion for connecting the elongated cross member to an inner side of the second elongate chassis beam. each battery module comprising battery packs configured to at least partially power the electric motor, and a chassis comprising a first elongate chassis beam and a second elongate chassis beam, both extending along a length of the road vehicle, each first and second elongate chassis beam comprising an inner surface (6A, 7A) and an outer surface (6B, 7B), the inner surfaces of the first and second chassis beams facing each other, the outer surfaces of the first and second chassis beams facing away from each other, and at least one cross connecting the first elongate chassis beam and the second elongate chassis beam, wherein the first battery module and the second battery module are arranged on an outer surface of the first and second elongate chassis beam, respectively; wherein the road vehicle further comprises a battery mounting system for mounting the vehicle battery to the chassis, the battery mounting system for each of the first and second battery module comprises: - a battery box configured to hold and support the battery packs of the battery module; - a front bracket mounted to and projecting from the outer surface of the respective elongate chassis beam; and - a posterior bracket mounted to and projecting from the outer surface of the respective elongate chassis beam such that the posterior bracket is spaced apart from the front bracket for receiving the respective battery box between the front bracket and the posterior bracket; the battery mounting system further comprises an elongated cross member which is connected between the front brackets on a respective side of the first and second elongate chassis beams and an elongated cross member which is connected between the posterior brackets on a respective side of the first and second elongate chassis beams, characterized in that at least one elongated cross member comprises a first inner chassis beam attachment portion for connecting the elongated cross member to an inner side of the first elongate chassis beam and a second inner chassis beam attachment portion for connecting the elongated cross member to an inner side of the second elongate chassis beam. - a battery box configured to hold and support the battery packs of the battery module; - a front bracket mounted to and projecting from the outer surface of the respective elongate chassis beam; and - a posterior bracket mounted to and projecting from the outer surface of the respective elongate chassis beam such that the posterior bracket is spaced apart from the front bracket for receiving the respective battery box between the front bracket and the posterior bracket; the battery mounting system further comprises an elongated cross member which is connected between the front brackets on a respective side of the first and second elongate chassis beams and an elongated cross member which is connected between the posterior brackets on a respective side of the first and second elongate chassis beams, characterized in that at least one elongated cross member comprises a first inner chassis beam attachment portion for connecting the elongated cross member to an inner side of the first elongate chassis beam and a second inner chassis beam attachment portion for connecting the elongated cross member to an inner side of the second elongate chassis beam.