Repair of 48V battery in Audi A6, A7, A8, Q7, Q8, if the car is standing for a long time, the 12V battery discharges and the voltage of the 48V battery starts to drop, it drops below the nominal value and the battery is blocked, a new battery costs €2000 and that is very a lot, we can help. The price of the repair is approx. €600, Error codes: P0A7D, P0B29.