Engine badge sets the battery size
From our verified fitment data, an A6 45 TFSI uses an 80Ah AGM and the 55 TFSI a 90Ah, a Q5 40 or 45 TFSI takes 80Ah and the SQ5 90Ah, and the Q7 steps up to 95Ah or 105Ah for the SQ7. Fitting the smaller unit because it happens to fit the tray leaves the car short of reserve on hot days.




