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Turns out the battery had been previously replaced by a shop and they did not code it properly.
This in turn damaged the INteligent Battery Sensor, luckily I found a perfect one at a local junk yard and purchased a new battery with a higher CCA since I live in Chicago.
No more battery drains since then!
Key things to look out for is your battery, alternator or voltage regulator, grounding straps! There are two, and I also found out that by doing the stupid M3 coul filter mod, rain water would go into my engine compartment and drip directly onto my starter which I replaced several times trying to diagnose my issue and every single starter removed was heavily corroded.
Good luck!
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