Charge transfer function in the event of failed starting

A vehicle, comprising:

• an internal combustion engine;
• a starter assigned to the internal combustion engine;
• an electrical system battery of the vehicle, the starter drawing power from the electrical system battery of the vehicle in order to start the internal combustion engine;
• an engine control unit assigned to the internal combustion engine;
• a backup battery connectable in parallel to the electrical system battery;
• an electric connection element arranged between the electrical system battery and the backup battery, the electric connection element being controllable by the engine control unit,
• wherein
• in an event of an engine start failure using the electrical system battery, the backup battery is electrically connected to the electrical system battery via the connection element in a manner that permits recharging of the electrical system battery with a predetermined amount of electric energy from the backup battery, and
• the engine control unit is configured to determine when the predetermined amount of electric energy has been transferred to the electrical system battery by integrating an amount of electric current supplied by the electrical connection to the electrical system battery over a length of time of the electrical system battery is recharged.