Really interesting design decision. Was the main battery also dead? I'm guessing not. There's a step-down converter under the rear seat that outputs 12-16 volts, Tesla could probably have fairly easily set the car up to power the doors from that when the auxiliary 12V battery dies.
this post was submitted on 24 Jun 2024
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Probably would still need the 12V battery to have enough charge to close the connection to the high voltage battery that would power the step down converter.
But yeah it seems dumb to me that most EVs don't keep the 12V battery topped up from the high voltage battery somehow while the car is parked, but I'm not an electrical engineer ¯\_(ツ)_/¯
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This is why I bought an EV with mechanical doors.