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I was able to wire up a F800 pro to a 20,000 MAH battery pack. When the car is on, it uses the car's battery and charges the battery pack at the same time. When it's off, it switches to the pack for parking mode. Runs for days on end without draining your car battery. Don't have to flip any switches, swap any wires or anything. All works seamlessly. Took a little bench testing and research, but I found all the parts that make it work.
Dashcam battery: 400 bucks
My setup: $60
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