The increased range of up to 1000 miles is rarely necessary in everyday life and longer journeys can usually be planned in advance. However, the additional battery capacity is a weight that consumes a lot of energy in everydays life. It would therefore be extremely interesting if the car is delivered with a (permanently installed) basic battery and the additional capacities could be easily installed for different ranges (e.g. by opening the belly). If the batteries are not required, they can be used, for example, as a buffer storage for a solar system, or they can be rented for longer journeys from a local service provider.