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.