The present invention relates to a secondary battery, for example a rechargeable battery or a lithium ion battery cells of nickel metal hydride battery unit formed, for example, using the battery in an electric vehicle or a hybrid vehicle and the vehicle in a traditional. The present invention also relates to a motor vehicle.Having means for determining a battery voltage of the battery voltage measuring device for at least one reversible re irrevocably separated from the battery in order to electrically charge or discharge circuit and the electronic component separation apparatus from the electrical network of the battery, the battery depth of the circuit separating off the discharge means and / or overvoltage condition. Characterized in that the battery device can be activated, it is set to deactivate the closed circuit holding action when activated by the activation of the separating apparatus. The apparatus according to the present invention allows the depth of battery discharge protection and overvoltage protection can be applied to a temporary power consumption and high power release applications.