Battery system comprising: • at least two batteries, each battery having a first terminal and a second terminal to supply electrical voltage, • wherein, for each battery, the first terminal and the second terminal of the same battery are electrically connectable to an electroconductive element via two separate switching elements for discharging each battery via the electroconductive element, • wherein each switching element is adapted to selectively connect the first terminal to the electroconductive element or isolate the first terminal from the electroconductive element, • wherein each switching element is adapted to connect each first terminal to the electroconductive element independent from the other switching elements, • the batteries are connected in series such that the first terminal of each battery except for a first boundary battery is connected to the second terminal of another battery, • wherein the first terminal of the first boundary battery and the second terminal of a second boundary battery supply the overall voltage of the connected batteries, • wherein the switching elements are provided for connecting the first terminals of all batteries and the second terminal of the second boundary battery to the electroconductive element, • wherein the second terminal of each battery except for the second boundary battery is electrically connectable to the electroconductive element only via the first terminal of an adjacent battery the second terminal is in contact with, and • wherein the first terminal and the second terminal of each battery correspond to at least a part of an outer surface of the battery, wherein at least a part of said outer surface corresponding to the first terminal is electrically connectable to the electroconductive element via the switching element. • at least two batteries, each battery having a first terminal and a second terminal to supply electrical voltage, • wherein, for each battery, the first terminal and the second terminal of the same battery are electrically connectable to an electroconductive element via two separate switching elements for discharging each battery via the electroconductive element, • wherein each switching element is adapted to selectively connect the first terminal to the electroconductive element or isolate the first terminal from the electroconductive element, • wherein each switching element is adapted to connect each first terminal to the electroconductive element independent from the other switching elements, • the batteries are connected in series such that the first terminal of each battery except for a first boundary battery is connected to the second terminal of another battery, • wherein the first terminal of the first boundary battery and the second terminal of a second boundary battery supply the overall voltage of the connected batteries, • wherein the switching elements are provided for connecting the first terminals of all batteries and the second terminal of the second boundary battery to the electroconductive element, • wherein the second terminal of each battery except for the second boundary battery is electrically connectable to the electroconductive element only via the first terminal of an adjacent battery the second terminal is in contact with, and • wherein the first terminal and the second terminal of each battery correspond to at least a part of an outer surface of the battery, wherein at least a part of said outer surface corresponding to the first terminal is electrically connectable to the electroconductive element via the switching element.