My Phaeton (3.0 D, year 2011, 31 tkm) has battery problems. However, these do not make themselves noticeable when starting, but only after a ride. At the beginning of May I parked the car after a journey of approx. 120 km for a break at a motorway road station. Until then there were no problems with the battery. When I wanted to start the car after a short break, the battery failed and the vehicle could not be started. I was then dropped off to the nearest workshop Leppt. There was diagnosed a defect of the battery. A cause for the defect was not found and a new battery was installed. Last week it was time again. The same rest site, the same defect, the same workshop. Again the same battery was defective and a cause was not found. I took over the car in November with a stand of 7,500 km and had to the first battery defect except for an accident in which the left side of the form of a The car is used almost exclusively for the long distance. However, I use different consumers: car telephone, in the stand also the TV, in front a TomTom hangs on the socket (ugly, but with the best real-time traffic messages) and if I do not drive myself, a charger for the notebook and a charger for a mobile phone hang at the rear of the sockets. In winter, however, the seat heating is added. I don’t know if this was the case before the battery stopped working. However, until May, the amount of consumers was not a problem. Meanwhile, I know that I can switch to the other battery for start-up, but I didn’t know that so far, and therefore I don’t know if the vehicle could have been started with the other battery. Two batteries in two months. And the factory is looking at it, it regularly shows a voltage of about 14 volts; and I don’t know if this was the case before the battery stopped working. I don’t want to have to install the next battery in two months. Is there anyone here who might find the cause of the defect?