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    Permanent 12V Aux Battery connected to 12V car Battery. Will it work?

    So I forgot to plug in the car before applying a software update. 5 hours later, car was dead. Something wonky with the update (2020.20.17). This is a 2018 Model X, with 2.5 years and 70K km. Jump starting was effective, but not immediate. I had to "revive" the old battery for at least 20 min...