So, I have an Audi A3 (8v). 1.8Tfsi S-Tronic (2013).
A bit of context: The car has done 70,000 miles, serviced yearly and not abused. Worked absolutely great no issues. I left the car to sit for 2 months and then I put a new battery in it (Varta, same one, Audi recommended I believe) and the...