Yeah but that would die out eventually, like your laptop. These newer cars with sophisticated systems probably do something like you're talking about. My macboo

Yeah but that would die out eventually, like your laptop. These newer cars with sophisticated systems probably do something like you're talking about. My macbook will write the contents of ram to the hard drive once the battery dies and load up form that image next time you boot it up, maybe that is a way to handle it in cars.