NOVELTY - Reduces the discharge of parts (5) of the battery bank (1), so as to balance, by substituting for the minimal step balancing voltage a higher balancing voltage (V1'), from the moment when the battery is no longer fed by the charger (2), from an upper time level to a determined time level (T).    USE - For battery balancing in a series connected battery bank, used in hybrid automobiles    ADVANTAGE - Reduces discharge of individual batteries in the bank when the bank is no longer fed by the charger. Avoids inappropriate discharge of a battery that is not being charged by authorizing re-balancing of higher charged batteries.    DETAILED DESCRIPTION - Method of balancing a series connected battery bank (1) composed of a number of series connected batteries (5) whose recharge is done by a charger (2) under the control of a battery management system associated with individual current supply modules (6), in parallel with each battery. Each circuit is activated when the voltage at the battery terminals falls below a minimal set balancing level (V1), common for all the batteries. The management system includes a control chain permanently providing an ALL or NOTHING signal, for a current circulating between the battery terminals through a series of transmission control gates (13) each linked to a battery. Each gate is controlled to interrupt the control chain current when the voltage at a battery terminals exceeds a maximum value (V2). All current interruption is translated into a switching control signal transmitted to the charger via a common control interface (7). In this case the minimal balancing voltage (V1) is substituted by a higher balancing voltage (V1') after a time greater than a set time (T) in response to interruption of the current circulating in the control chain. An INDEPENDENT CLAIM is also included for a battery management system.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic of charger and battery management system.    battery bank (1)    charger (2)    user circuit (3)    batterys (5)    current supply modules (6)    common interface (7)    voltage measurement (8)    resistance measurement (9)    control gate. (13)