Abstract: A regulator circuit for a battery of electrical storage cells, and in particular a battery whose voltage is a function of state of charge and which is constituted by "n" identical modules connected in series. The circuit comprises "n-1" regulation modules each associated with two series-connected modules of the battery, each regulation module includes means for bringing the voltage across the terminals of each of the two series-connected battery modules with which it is associated to a common value by diverting current taken from across the terminals of the module which provides the greater voltage across its terminals, end until said greater voltage has been reduced to the value present across the terminals of the module providing the smaller voltage.