So, I got a new battery and it's nice and fully charged. Same make as the old one it is replacing. I also have an OBD scanner specifically for Audi.
I managed to fully charge the old battery and when back in the car the alternator outputs 13.85V. When I put the new battery in the car the alternator runs at 13.3V.
I've tried to register the battery using the scanner but the numbers I have (model & serial) don't seem to be accepted.
Anyone here used an Autophix 5600 on an Audi before? Ta.