State Farm has said they will not cover any drone used for commercial work (Part 107). They further explained that even if you are flying for a Hobby, IF the drone in question has ever been used for commercial work, they will not pay. So if you...
He wants to charge from a PD power bank, not a vehicle, the quote was an attempt to have said power bank "simulate" a car for the car charger to be connected to but yeah, won't work.
"Others tried using a car charger powered by a USB-C to 12V car socket adapter, with mixed success"
Why not just use an inverter plugged into your vehicle cigarette lighter socket and produce 120v to the DJI charger.
Some vehicle have 120v...
When I first played back a video from my M4 Pro, it was with a video player and it was also choppy. I then loaded it into Premier Pro and CapCut where it played smoothly on both. Not an expert, but it may be the players your using can't handle...