D201GLY2, DC-DC power, 3.5 inch SATA
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I think more of what he is asking is can you boot with the car starting and hibernate without a laptop battery. I think most laptop guys have a script that senses the ac power disconnected and the laptop switches to battery which runs the program causing it to hibernate. This is what I am looking into right now also since my laptop battery is dead and the laptop will be used in cold weather. batteries and cold do not mix.
I really like this idea that W3bMa5t3r created.
I would really like to make something similar to this but still unsure how to power it off without a battery. I for sure don't want to be clicking hibernate each time i get out of the car. Also you risk forgetting to hibernate and coming back to a car with a dead battery.
I will do some more researching today and see what I can come up with. I will post here once I find some type of solution that makes sense.