A transport system comprising: - a seagoing vessel comprising a battery room for at least one swappable battery pack for providing power for at least propulsion of the vessel, the battery room comprising at least one battery bay for securely holding a battery pack in the battery room, which at least one battery bay is provided with an electric contact element that is electrically connected to at least the vessel's electric motor or motors; - at least two battery packs, of which at least one battery pack is arranged on the vessel when the vessel is in operation; - a charging station for charging the battery packs, which charging station is located outside the vessel, but such that the vessel can be positioned relative to the charging station for transfer of one or more battery packs between the vessel and the charging station, and which comprises a charging station support plate mounted on at least one cylinder/piston device such that the charging station support plate is moveable up and down in an essentially vertical direction; and - a transfer device for transfer of the battery packs back and forth between the vessel and the charging station when the vessel is positioned by the charging station, the transfer device comprising a battery transfer plate for support of the at least one battery pack, which battery transfer plate is fastened on its bottom edge to the charging station support plate by telescopic fasteners and is movable in and out of the charging station in the direction of the vessel's battery room when the vessel lies at the charging station, such that the at least one battery transfer plate can be moved forward towards the battery bay in the battery room and back into the charging station. - a seagoing vessel comprising a battery room for at least one swappable battery pack for providing power for at least propulsion of the vessel, the battery room comprising at least one battery bay for securely holding a battery pack in the battery room, which at least one battery bay is provided with an electric contact element that is electrically connected to at least the vessel's electric motor or motors; - at least two battery packs, of which at least one battery pack is arranged on the vessel when the vessel is in operation; - a charging station for charging the battery packs, which charging station is located outside the vessel, but such that the vessel can be positioned relative to the charging station for transfer of one or more battery packs between the vessel and the charging station, and which comprises a charging station support plate mounted on at least one cylinder/piston device such that the charging station support plate is moveable up and down in an essentially vertical direction; and - a transfer device for transfer of the battery packs back and forth between the vessel and the charging station when the vessel is positioned by the charging station, the transfer device comprising a battery transfer plate for support of the at least one battery pack, which battery transfer plate is fastened on its bottom edge to the charging station support plate by telescopic fasteners and is movable in and out of the charging station in the direction of the vessel's battery room when the vessel lies at the charging station, such that the at least one battery transfer plate can be moved forward towards the battery bay in the battery room and back into the charging station.