The invention relates to a charge equalization system for batteries, comprising at least two accumulator stages in series, each stage comprising an accumulator or at least two accumulators connected in parallel. The invention is characterised in that said system is provided with an associated charging device (5) for each accumulator stage, comprising: at least one inductance for storing energy; at least one first diode and at least one second diode, such that the first diode is connected to the negative pole of said accumulator stage (Eti) by its anode, and to one of the two ends of the inductance by its cathode, and said second diode is connected to the positive pole of said accumulator stage by its cathode, and to the other end of the inductance by its anode; and at least one first controlled switch and at least one second controlled switch, such that the first switch is connected to the negative pole of the battery and to the anode of the second diode, and the second controlled switch is connected to the positive pole of the battery and to the cathode of the first diode. The invention is also characterised in that the system also comprises a device (3) for controlling said charging devices (5), designed to close said switches of a charging device (5) associated with an accumulator stage (Eti) to be charged, such that said at least one inductance stores energy, and to open the controlled switches so as to transfer energy to the associated accumulator stage (Eti).