I would also like to come up with a way to power the android box separately from the head unit (it must be possible to some extent because you can remove the android box and use it with a monitor or TV via HDMI). Maybe mount a small battery of some sort that can power the android box in sleep mode for several days (via USB) but the amps and monitor left off. Then when you start the car the main car battery could keep the android battery topped off. The android unit should come out of sleep mode and ready to go in just a couple of seconds.
I just noticed in the video that the power button puts it to sleep.
I expect devices like this to go to sleep when you turn off the ignition and wake up when you turn it on. I don't understand why all the others completely shut off and have to cold boot every time. If my phone can last for a week in sleep (and in airplane mode) then one of these HUs should be able to sleep for a day without draining the car battery. And they could always cause it to fully shut down if they detect a drop in battery voltage.
It'll depend on how they have it wired for power. The power button may put it to sleep but when the ignition is turned off it cuts power to most functions (usually only a clock and some form of memory to store stations and so forth). They could set it up to power the unit in sleep mode but I bet they play it safe and shut it down when the ignition is off (don't want people complaining about dead car batteries). I think it would be best if it had a separate battery to run on. That battery could keep it in sleep mode and power it for use. Then wire that battery to charge via the car battery when the ignition is on. Seems very doable to me. You'd just need a 12v battery to run the unit and a way to charge it via the car battery. That way it would never run down the car battery and the worst case if the car sat for a long time would be a cold boot when the battery started getting power from the car.
You're probably right.
A device that does what we're talking about is actually pretty simple: a laptop battery would be plenty of juice, and a handful of semiconductors would do the rest.
Someone ought to make one. I'll bet they'd sell it to everyone who bought an Android head unit.
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