NOVELTY - The method involves lifting a universal exchanging unit comprising a plate (11), an actuating device (12) and a slider (13), to position the plate in support under a motor vehicle (1) for obtaining a correction of attitude and positioning of the vehicle at a desired altitude. The actuating device and the slider are lifted to cooperate with a locking mechanism of a power supply battery (2) of the vehicle to lock and/or unlock the battery. The battery is supported and transported on the slider outside housing of the battery on the vehicle.    USE - Method for dismounting and/or mounting a power supply battery of a driving motor of a motor vehicle such as electric or hybrid vehicle e.g. electric or hybrid car, for exchanging the battery in a battery replacement station (all claimed). Can also be used for dismounting or mounting any component in a lower part of a vehicle such as lorry and train.    ADVANTAGE - The universal exchanging unit forms a unique block or dedicated assembly to allow simple and inexpensive management, compact storage, and easy and optimized displacement of batteries. The same assembly enables dismounting and/or mounting the power supply battery of any vehicle in a simple, robust and reliable manner, thus allowing inexpensive production in series and simple management in the battery replacement station. The method allows an individual to enter into and/or leave from the vehicle during the battery exchanging process, thus ensuring better user-friendliness.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a method for exchanging a power supply battery of a driving motor of a motor vehicle    (2) a unit for exchanging a power supply battery of a driving motor of a motor vehicle    (3) a battery replacement station for replacing a power supply battery of a driving motor of a motor vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic side sectional view of a battery exchanging system.    Motor vehicle (1)    Power supply battery (2)    Plate (11)    Actuating device (12)    Slider (13)