Battery system , in particular for an electrically driveable motor vehicle, having at least one battery sub-unit and at least one high-current line , wherein the battery sub-unit has - at least one galvanic element , - at least one power switching transistor , which is connected in series with the galvanic element , and via which the galvanic element is able to be electrically conductively connected to the high-current line , - at least one power bypass transistor that is connected in parallel with the power switching transistor and with the galvanic element , and - at least one electronic device that is configured for acquiring at least one operating parameter of the battery sub-unit and is connected to the power switching transistor and/or the power bypass transistor using communication technology, - wherein the electronic device is configured to generate a data signal assigned to the operating parameter, in that it electrically activates the power switching transistor and/or the power bypass transistor in such a manner that the electrical resistance of the power switching transistor and/or the power bypass transistor is modulated in at least one predeterminable time interval in order to modulate the level of the electric current flowing in the high-current line , and wherein the electronic device is configured to generate a data signal assigned to the operating parameter in that it electrically activates the power bypass transistor , with closed power switching transistor and open power bypass transistor , and the power switching transistor , with closed power bypass transistor and open power switching transistor , in such a manner that some of an electric current flowing in the high-current line flows through the power bypass transistor or the power switching transistor , respectively, in at least one predeterminable time interval. - at least one galvanic element , - at least one power switching transistor , which is connected in series with the galvanic element , and via which the galvanic element is able to be electrically conductively connected to the high-current line , - at least one power bypass transistor that is connected in parallel with the power switching transistor and with the galvanic element , and - at least one electronic device that is configured for acquiring at least one operating parameter of the battery sub-unit and is connected to the power switching transistor and/or the power bypass transistor using communication technology, - wherein the electronic device is configured to generate a data signal assigned to the operating parameter, in that it electrically activates the power switching transistor and/or the power bypass transistor in such a manner that the electrical resistance of the power switching transistor and/or the power bypass transistor is modulated in at least one predeterminable time interval in order to modulate the level of the electric current flowing in the high-current line , and wherein the electronic device is configured to generate a data signal assigned to the operating parameter in that it electrically activates the power bypass transistor , with closed power switching transistor and open power bypass transistor , and the power switching transistor , with closed power bypass transistor and open power switching transistor , in such a manner that some of an electric current flowing in the high-current line flows through the power bypass transistor or the power switching transistor , respectively, in at least one predeterminable time interval. <EOS>