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1 comment of this product found across Reddit:
grem75 /r/techsupportmacgyver
1 point
1970-01-17 09:03:21.49 +0000 UTC

Physics doesn't care what you have on hand, 10W+ from USB just isn't going to happen.

These aren't too big and SLA is by far the cheapest route. It would run the Pi and screen for hours on a charge.

Run the Pi on something like this.

I'd wire it to a lighter plug and then have a socket connected to the battery, that way you could just unplug it and plug it into the car.