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tesla 3 12v battery maintenance?

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If you keep your car plugged in all the time, then the 12 volt battery will be fine.
Actually plugged in doesn't matter for the 12V battery. When the 12V battery needs to be recharged and the car is not active it enters "support/conditioning" mode, where the High Voltage contactors are closed and the Power Conversion System recharges the 12V battery.