Method for communication between control electronics and a plurality of electrochemical accumulators, each accumulator including at least: • one electrochemical cell consisting of at least one anode and one cathode on either side of an electrolyte; • at least two current output terminals (2, 4), each linked to one or the other of the one or more anodes and cathodes; • a first housing containing the one or more electrochemical cells in a leaktight manner; • a second housing attached to the inside of the first housing and defining within itself a leaktight confined volume; • an electronic module arranged in said leaktight confined volume, the electronic module including at least: - a memory; - a communication module, suitable for receiving and/or transmitting data from and/or to the outside of the first housing, a processor; - a processor, suitable for receiving and/or transmitting at least data from and/or to the communication module, the method being characterized in that the control electronics and each electrochemical accumulator exchange data by means of each communication module, the communication being carried out by means of powerline communication currents such that the output current of the electrochemical accumulators carries data coded in an information signal, and in that either - the monitoring electronics are connected in diversion to the output terminals of each electrochemical accumulator; or - the monitoring electronics are linked to the ends of the plurality of accumulators connected in series, each accumulator processor performing an operation of modulating the information signal at input regardless of the existing upstream modulation or over a time period specific to each accumulator. • one electrochemical cell consisting of at least one anode and one cathode on either side of an electrolyte; • at least two current output terminals (2, 4), each linked to one or the other of the one or more anodes and cathodes; • a first housing containing the one or more electrochemical cells in a leaktight manner; • a second housing attached to the inside of the first housing and defining within itself a leaktight confined volume; • an electronic module arranged in said leaktight confined volume, the electronic module including at least: - a memory; - a communication module, suitable for receiving and/or transmitting data from and/or to the outside of the first housing, a processor; - a processor, suitable for receiving and/or transmitting at least data from and/or to the communication module, the method being characterized in that the control electronics and each electrochemical accumulator exchange data by means of each communication module, the communication being carried out by means of powerline communication currents such that the output current of the electrochemical accumulators carries data coded in an information signal, and in that either - the monitoring electronics are connected in diversion to the output terminals of each electrochemical accumulator; or - the monitoring electronics are linked to the ends of the plurality of accumulators connected in series, each accumulator processor performing an operation of modulating the information signal at input regardless of the existing upstream modulation or over a time period specific to each accumulator. - a memory; - a communication module, suitable for receiving and/or transmitting data from and/or to the outside of the first housing, a processor; - a processor, suitable for receiving and/or transmitting at least data from and/or to the communication module, - the monitoring electronics are connected in diversion to the output terminals of each electrochemical accumulator; or - the monitoring electronics are linked to the ends of the plurality of accumulators connected in series, each accumulator processor performing an operation of modulating the information signal at input regardless of the existing upstream modulation or over a time period specific to each accumulator.