Industrial vehicle comprising a battery locking system

There is provided an industrial vehicle comprising a battery locking system, which comprises a compartment for receiving a battery pack formed by at least two supporting walls; at least one opening in the compartment between two of the supporting walls for installation or removal of the battery; a fixed holder (115) arranged in vicinity of the at least one opening; and a locking mechanism comprising (110a), in an upper part, an angled locking surface (118), facing the compartment, adapted to block the battery pack in two directions, and, in a lower part, adapted to be connected to the fixed holder (115), the locking mechanism being axially displaceable in relation to the fixed holder, and, in an inserted position, being at least partly rotatable. One of the fixed holder and the locking mechanism comprises a socket (115) and the other comprises a corresponding stub shaft (112) to be inserted to the socket, and a first guide channel (115) is arranged in one of the socket and the stub shaft; and a first protrusion (117) is arranged on the other of the stub shaft and the socket, the protrusion being adapted to cooperate with the first guide channel so as to guide the axial displacement between the socket and the stub shaft between the inserted position and an extended position of the stub shaft in relation to the socket. A corresponding method for displacing a battery pack of the industrial vehicle is also provided.