Storage battery with low losses

An accumulator battery (4), characterized by comprising at least first and second branches (Br1, Br2) having, each, at least first (E1,1, E1,2) and second (E2 1, E2,2) batteries connected in series, so that the battery further comprises a circuit breaker (D2,1) through the intermediary of which the first accumulator are connected in parallel, and whose second accumulators intermediation connected in parallel, so that the cutoff breaker is sized to conduct current when one of said accumulators forms an open circuit.