I've had a similiar issue with my E83. I've not had the issue with the E46. Did a detailed check on my E83 and never found any parasitic drain. I have a second replacement OEM battery sitting in the garage. It has 3k miles on it and its totally dead. I am attibuting my problem to a defective battery more than anything right now. I thought it might have been the BT module "sticking" but its not. The "test" has been leaving the vehicle parked without the trickle charger for periods between 1-4 weeks and being able to start vehicle with no issues or slow cranking. Another concern I found on the E83 was a stickly exhaust valve due to a hole in the vacumn hose. I've not read that this causes a parasitic drain though.

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E83 - Aero PKG Mods installed: Homelink mirror. CIS-IBUS video module, AUX, Rr Dr Release, stock wheels, Remote start, CarPC (Atom) & mud flaps - NAV - MKIV - NA Map DVD - 2011
E46 - 18.5 wheels/tires (summer), 17 stock (winter), Homelink, NAV software upgrade, BMW video module, Radio to V53, AUX, USB IBUS interface,BMW alarm install, CarPC(Epia), remote starter, tank battery & angel eyes. NAV - MKIII - NA Map CD - High Version 2008.1