Battery-operated working vehicle, in particular an industrial truck, comprising: - a frame (3; 3a) with a battery compartment (5; 5a) comprising a lateral battery compartment opening, - a battery carrier (11; 11 a) for a battery block received inside the battery compartment (5; 5a), - a battery changing device with a linear drive device for moving the battery carrier (11; 11 a) through the battery compartment opening between a retraction position where it is at least almost completely received inside the battery compartment and an extended position where it is at least substantially outside the battery compartment (5; 5a), characterized in that - the battery changing device comprises a base support (9; 9a) which can be extended and retracted in relation to the battery compartment (5; 5a) to support the battery carrier (11; 11 a) against the ground when it is moved into the extended position, - the linear drive device is set between the battery carrier (11; 11 a) and the base support (9; 9a) and can be activated for applying pushing and pulling forces to the battery carrier (11; 11 a) and the base support (9; 9a) to move them in relation to each other and that locking means (23, 33; 23a) are provided for alternately locking the battery carrier (11; 11 a) and the base support (9; 9a) in relation to the frame (3; 3a), namely for locking the battery carrier (11; 11 a) in its retraction position and for locking the base support (9; 9a) in its extended position so that when the battery carrier (11; 11 a) is locked the base support (9; 9a) can be extended and retracted by means of the linear drive device, and when the base support (9; 9a) is locked the battery carrier (11; 11 a) can be moved between the retraction position and the extended position by means of the linear drive device while it is supported at the base support (9; 9a). - a frame (3; 3a) with a battery compartment (5; 5a) comprising a lateral battery compartment opening, - a battery carrier (11; 11 a) for a battery block received inside the battery compartment (5; 5a), - a battery changing device with a linear drive device for moving the battery carrier (11; 11 a) through the battery compartment opening between a retraction position where it is at least almost completely received inside the battery compartment and an extended position where it is at least substantially outside the battery compartment (5; 5a), characterized in that - the battery changing device comprises a base support (9; 9a) which can be extended and retracted in relation to the battery compartment (5; 5a) to support the battery carrier (11; 11 a) against the ground when it is moved into the extended position, - the linear drive device is set between the battery carrier (11; 11 a) and the base support (9; 9a) and can be activated for applying pushing and pulling forces to the battery carrier (11; 11 a) and the base support (9; 9a) to move them in relation to each other and that locking means (23, 33; 23a) are provided for alternately locking the battery carrier (11; 11 a) and the base support (9; 9a) in relation to the frame (3; 3a), namely for locking the battery carrier (11; 11 a) in its retraction position and for locking the base support (9; 9a) in its extended position so that when the battery carrier (11; 11 a) is locked the base support (9; 9a) can be extended and retracted by means of the linear drive device, and when the base support (9; 9a) is locked the battery carrier (11; 11 a) can be moved between the retraction position and the extended position by means of the linear drive device while it is supported at the base support (9; 9a).