Hi, got my Q5 4 weeks ago and loved it until it started discharging the battery all the time. Had Audi assist out 4 times then it went back to the dealer on Monday. Seems its a faulty ACU (dont know what that is) but they are unsure if it is heater control ACU or ACU which is running when the car is turned off hence draining the battery. Let you know what happens but sooo wanted the quattro this am when I saw the snow!!!!!!