A battery module support arrangement for supporting a battery module to a longitudinally extending frame rail (13a, 13b) of an electrified heavy vehicle; the battery module support arrangement comprising: - a pair of triangularly shaped support brackets (102, 102', 102", 102′′′) spaced apart from each other, each of the triangularly shaped support brackets (102, 102', 102", 102′′′) comprising a rail attachment portion for connecting the triangularly shaped support bracket (102, 102', 102", 102′′′) to the longitudinally extending frame rail (13a, 13b), and an angled portion extending downwardly between the rail attachment portion and a lower end portion of the triangularly shaped support bracket when the triangularly shaped support bracket is connected to the longitudinally extending frame rail (13a, 13b), wherein a first one of the triangularly shaped support brackets comprises at least one battery module support portion (110', 110") positioned along the angled portion of the first support bracket, and a second one of the triangularly shaped support brackets comprises a pair of battery module support portions (110, 110′′′) positioned along the angled portion of the second support bracket, wherein the battery module support portion (110', 110") of first support bracket is arranged at a different position along the angled portion compared to the position of at least one of the battery module support portions (110, 110′′′) of the second support bracket, characterized in that the second one of the triangularly shaped support brackets further comprises at least a third battery module support portion (110") arranged along the angled portion, wherein the third battery module support portion (110") is arranged between the pair of battery module support portions (110, 110′′′). - a pair of triangularly shaped support brackets (102, 102', 102", 102′′′) spaced apart from each other, each of the triangularly shaped support brackets (102, 102', 102", 102′′′) comprising a rail attachment portion for connecting the triangularly shaped support bracket (102, 102', 102", 102′′′) to the longitudinally extending frame rail (13a, 13b), and an angled portion extending downwardly between the rail attachment portion and a lower end portion of the triangularly shaped support bracket when the triangularly shaped support bracket is connected to the longitudinally extending frame rail (13a, 13b), wherein a first one of the triangularly shaped support brackets comprises at least one battery module support portion (110', 110") positioned along the angled portion of the first support bracket, and a second one of the triangularly shaped support brackets comprises a pair of battery module support portions (110, 110′′′) positioned along the angled portion of the second support bracket, wherein the battery module support portion (110', 110") of first support bracket is arranged at a different position along the angled portion compared to the position of at least one of the battery module support portions (110, 110′′′) of the second support bracket, characterized in that the second one of the triangularly shaped support brackets further comprises at least a third battery module support portion (110") arranged along the angled portion, wherein the third battery module support portion (110") is arranged between the pair of battery module support portions (110, 110′′′).