I looked back through the old threads and didn't see this question asked so forgive me if I am beating a dead horse.  How do you all charge you Phantom 4 batteries in the field?  I have a Phantom 4 RTK, about 10 batteries and have tried charging them in the field several different ways and still cannot keep up with how fast I work.  Vehicle outlets don't seem to work well becuase they take too long, battery with inverter didn't work and now I am seriously looking at getting a full gas generator just to charge these batteries.  Someone please tell me they have found a better alternative.
Thanks

What you are facing is an issue that we hace all faced for years now. I tried all sorts of options and the only solution I found that works properly is to carry more batteries with you.

Hello there. Good day and thank you for reaching out. I hope that our fellow DJI co pilots can give out the best recommendation and information with regards to this matter. Thank you.

Ten batteries?  Maybe four hours' worth? That's some work rate!  Maybe the only solution is - yet more batteries.

Hi,
I have 5 batteries, two chargers, a fixed gasoline alternating current generator has a platform behind my vehicle.
I can fly the drone all the day without discontinuing, and process the images of the flight preceding on the computer. It's a bit noisy but the time saving is huge.

Thule EasyBase | Thule | United Kingdom
INVERTER GENERATOR 1,0KW - Yato