The invention relates to a self-contained motorization system comprising at least one electric motor (9), a controller (8) adapted to drive the operation of the electric motor (9), a set of accumulators of power type (5) adapted to feed the motor (9), a central control unit (7), a base (3) adapted for removably receiving a set of accumulators of energy type (4) and a direct current converter (2) adapted for connecting the set of accumulators of energy type (4) to the set of accumulators of power type.The self-contained motorization system makes it possible to meet both high power needs and significant self-containment needs, while allowing easy maintenance and the use of technologies not subject to transport restrictions.