Liquid 1, I wish I could say what the "vampire" is. I do know that "things" continue to run after you shut the engine off. A little evidence of that is when you do shut it off, if you continue to watch the instrument cluster you can see the tach and Speedo "dip" and if you listen you'll hear some servos actuate, I think in the ventilation system and then it appears to go quiet. I'm sure the "onboard computers" are still active to some degree. The memory for the audio, nav system if you have it, that "flight" data recorder that captures the last 30 seconds continueous as you drive, and I'm sure it stores that until you start driving again oh and don't forget about the emissions system monitors and who knows what else? These things are typical for todays cars though.
Are you just using a multimeter to test for charging voltage or something more? I know you don't use a multimeter to test a battery because you can't load test it that way. I'd imagine it's the same and I don't have a load tester.
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