Two-voltage battery for a vehicle - comprising an earth point, - comprising a plurality of battery cells, - wherein groups (2, 3) of series-connected battery cells form battery cell blocks (A1, A2, A3), and - wherein at least one first battery cell block is permanently connected to the earth point of the two-voltage battery, - comprising a plurality of cell monitors (Z1, Z2, Z3) for the battery cell blocks (A1, A2, A3), - wherein the cell monitors (Z1, Z2, Z3) are configured for monitoring a voltage provided by the individual battery cells of the respective battery cell block (A1, A2, A3) and/or a current through the battery cells of the respective battery cell block (A1, A2, A3), and - comprising a plurality of power switching elements (P1+, P2+, P2-, P3+, P3-, S1, S2, S3) for optionally connecting the battery cell blocks (A1, A2, A3) in parallel and/or in series, - wherein, in a first connection arrangement, the battery cell blocks (A1, A2, A3) are connected in parallel and a first voltage is provided at a first terminal point, and - wherein, in a second connection arrangement, the battery cell blocks (A1, A2, A3) are connected in a series arrangement and the first voltage is provided at the first terminal point and/or a second voltage is provided at a second terminal point, characterized - in that the cell monitors (Z1, Z2, Z3) are connected to a microcontroller of the two-voltage battery via a data line arrangement, - wherein at least one voltage level adapter (14, 15, 16, 19) is provided between at any rate individual cell monitors (Z1, Z2, Z3) and the microcontroller, which voltage level adapter provides, for an input voltage signal which is present at an input of the voltage level adapter (14, 15, 16, 19) assigned to the assigned cell monitor (Z1, Z2, Z3) and which has a different voltage level in the first connection arrangement and in the second connection arrangement, in the first connection arrangement and in the second connection arrangement of the battery cell blocks (A1, A2, A3), at an output of the voltage level adapter (14, 15, 16, 19) connected directly or indirectly to the microcontroller, an output voltage signal in a prespecified voltage level interval, the interval width of which is smaller than a difference between the voltage level of the input voltage signal in the first connection arrangement and in the second connection arrangement, - wherein the voltage level interval for the output voltage signal is chosen here such that it is possible to distinguish between a logic zero, on the one hand, and a logic one, on the other hand, on the part of the microcontroller. - comprising an earth point, - comprising a plurality of battery cells, - wherein groups (2, 3) of series-connected battery cells form battery cell blocks (A1, A2, A3), and - wherein at least one first battery cell block is permanently connected to the earth point of the two-voltage battery, - comprising a plurality of cell monitors (Z1, Z2, Z3) for the battery cell blocks (A1, A2, A3), - wherein the cell monitors (Z1, Z2, Z3) are configured for monitoring a voltage provided by the individual battery cells of the respective battery cell block (A1, A2, A3) and/or a current through the battery cells of the respective battery cell block (A1, A2, A3), and - comprising a plurality of power switching elements (P1+, P2+, P2-, P3+, P3-, S1, S2, S3) for optionally connecting the battery cell blocks (A1, A2, A3) in parallel and/or in series, - wherein, in a first connection arrangement, the battery cell blocks (A1, A2, A3) are connected in parallel and a first voltage is provided at a first terminal point, and - wherein, in a second connection arrangement, the battery cell blocks (A1, A2, A3) are connected in a series arrangement and the first voltage is provided at the first terminal point and/or a second voltage is provided at a second terminal point, characterized - in that the cell monitors (Z1, Z2, Z3) are connected to a microcontroller of the two-voltage battery via a data line arrangement, - wherein at least one voltage level adapter (14, 15, 16, 19) is provided between at any rate individual cell monitors (Z1, Z2, Z3) and the microcontroller, which voltage level adapter provides, for an input voltage signal which is present at an input of the voltage level adapter (14, 15, 16, 19) assigned to the assigned cell monitor (Z1, Z2, Z3) and which has a different voltage level in the first connection arrangement and in the second connection arrangement, in the first connection arrangement and in the second connection arrangement of the battery cell blocks (A1, A2, A3), at an output of the voltage level adapter (14, 15, 16, 19) connected directly or indirectly to the microcontroller, an output voltage signal in a prespecified voltage level interval, the interval width of which is smaller than a difference between the voltage level of the input voltage signal in the first connection arrangement and in the second connection arrangement, - wherein the voltage level interval for the output voltage signal is chosen here such that it is possible to distinguish between a logic zero, on the one hand, and a logic one, on the other hand, on the part of the microcontroller.