Battery constantly empty (although ok), but quiet current 600~800mA. Where is this current secretly drawn?

Hello, with our Ibiza 6J the battery is always empty. The charging voltage of the alternator is fine and the battery has been changed already. Nevertheless, the car is a few days, the battery is empty and the current is only enough to crack the starter, but no longer for turning. I have now measured the resting current, although really everything is switched off, the key is pulled off and all doors are closed, the car pulls between 0.6A~0.8A. If 600mA to 800mA are not vie I too much? Where is this stream being pulled secretly? MfG Chris