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If the car is off, and only in ACC mode, then you can only pull off the 12V battery, and not the traction battery (they are two different things). No, the car will not charge the 12V battery unless it's in ready mode. This is a safety feature. If you want to leave the car off, and run something for an extended period of time that uses high current, I would recommend that you get an external battery, like a Jackery.
 
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