Need some advice

[AFTT47]

SteelCurtain, I have a background in electronics. I can tell you that car batteries are specifically designed to produce a large amount of amperage at once for starting but they will be damaged if they are too deeply discharged too many times. It wouldn't take much to damage it (especially in a hot climate). Modern cars have so many systems, it might be difficult to detect where the draw is coming from. You would have to use an ammeter to measure the draw on the battery when the car is sitting while disconnecting various systems and see when the drain goes away. The simplest way to do that would be to sequentially remove fuses and observe the change in current draw. It could also be a case of inadequate charge from the alternator. A faulty charging system could cause that or it could be something as simple as a slipping belt.

I'm not familiar with Audi but I can vouch for Subaru. They have a unique design ethic. Good, reliable cars. If you want something sexy, get a Tesla.