Mounting device for a composite battery for providing different voltages and currents for a consumer from at least one battery cell, in particular at least one round cell of an accumulator, having electrical contacts for removing the stored electrical energy, said mounting device comprising a printed circuit board with electrical lines (34, 35, 36, 37, 38) and switching elements (41, 42) for electrically connecting the at least one battery cell to the consumer and a safety device (51, 52, 53, 54) for monitoring the function of the at least one battery cell, characterized in that a housing (61, 62) for receiving a plurality of battery cells comprising a first housing part and a second housing part is provided, wherein each first and second housing part comprises a plurality of contact regions, wherein each battery cell can be fixed between in each case at least one contact region of the first and second housing part, wherein each contact region in the first and/or second housing part is designed as an enclosure for receiving in each case one battery cell, and wherein each enclosure is designed for at least partially enclosing a battery cell that can be accommodated therein; the printed circuit board comprises a plurality of recesses for receiving in each case one enclosure with a battery cell, wherein each recess comprises a first contact surface for electrically connecting a positive pole of a battery cell and a second contact surface for electrically connecting a negative pole of the battery cell to the electrical lines, wherein in each case one of the contact surfaces, preferably the first contact surface, is electrically connected to the electrical lines of the printed circuit board via the safety device, and the safety device comprises a safety instrument for each battery cell for electrical overcurrent protection, wherein each battery cell in one of said enclosures is electrically connectable to the printed circuit board in a detachable manner via the respective first and second contact surfaces, and wherein each recess in the printed circuit board is dimensioned such that a battery cell can be enclosed in one of said enclosures in a maximum cross-sectional area of the battery cell. a housing (61, 62) for receiving a plurality of battery cells comprising a first housing part and a second housing part is provided, wherein each first and second housing part comprises a plurality of contact regions, wherein each battery cell can be fixed between in each case at least one contact region of the first and second housing part, wherein each contact region in the first and/or second housing part is designed as an enclosure for receiving in each case one battery cell, and wherein each enclosure is designed for at least partially enclosing a battery cell that can be accommodated therein; wherein each first and second housing part comprises a plurality of contact regions, wherein each battery cell can be fixed between in each case at least one contact region of the first and second housing part, wherein each contact region in the first and/or second housing part is designed as an enclosure for receiving in each case one battery cell, and wherein each enclosure is designed for at least partially enclosing a battery cell that can be accommodated therein; the printed circuit board comprises a plurality of recesses for receiving in each case one enclosure with a battery cell, wherein each recess comprises a first contact surface for electrically connecting a positive pole of a battery cell and a second contact surface for electrically connecting a negative pole of the battery cell to the electrical lines, wherein in each case one of the contact surfaces, preferably the first contact surface, is electrically connected to the electrical lines of the printed circuit board via the safety device, and the safety device comprises a safety instrument for each battery cell for electrical overcurrent protection, wherein each battery cell in one of said enclosures is electrically connectable to the printed circuit board in a detachable manner via the respective first and second contact surfaces, and wherein each recess in the printed circuit board is dimensioned such that a battery cell can be enclosed in one of said enclosures in a maximum cross-sectional area of the battery cell. wherein each recess comprises a first contact surface for electrically connecting a positive pole of a battery cell and a second contact surface for electrically connecting a negative pole of the battery cell to the electrical lines, wherein in each case one of the contact surfaces, preferably the first contact surface, is electrically connected to the electrical lines of the printed circuit board via the safety device, and the safety device comprises a safety instrument for each battery cell for electrical overcurrent protection, wherein each battery cell in one of said enclosures is electrically connectable to the printed circuit board in a detachable manner via the respective first and second contact surfaces, and wherein each recess in the printed circuit board is dimensioned such that a battery cell can be enclosed in one of said enclosures in a maximum cross-sectional area of the battery cell.