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Also, you mentioned that the car was plugged in overnight. If the time from full charge, to unplugging can allso drain your 12v battery. Suggest looking in the book for the reasoning on this.
 

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I don't quite understand the great concern on the battery voltage. After three days with no activity on the car, my battery is at 11.5V. I am not concerned. A full battery is 12.6v. When I see 10v, I will be concerned. When I start (ready) the machine, the battery voltage will go to 14.3v or.4. Parasitic draw is there, and that is a fact. I believe that as long as it is not an external draw the car will function just fine. My rav is 11 months old and has sat for up to a week with no external connection and starts just fine. FWI
 
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