I don't know why dji do this but I do know that I will never buy a dji product again. They don't deserve our respect as we don't have their!
When I bought my Mavic zoom wasn't an option to stop charging Android phone from the controller until they release the famous update for dji go 4.3.0, and the option was there on mine Huawei p9.
I could select to charge or not charge my phone and everything was working really good until the next fw update.
I'm very very stupid. Why I did it??
Now there is no more option to stop charging the phone. And I'm feeling very stupid because nobody is talking about it. You only know that there is no option for that and they are telling us that Android need to be charging to transfer data, but that it's not true, because I already saw that option and already worked with mine Huawei p9 many times before the last update I did. My controller battery now sucks and I think I can't even fly 3 battery's on my Mavic without total drain the controller.
Now, two years after
Mavic 2 release and a bunch of fw updates still no solution for this.
This is something not only related (if it's related...) to Dji Go 4 app fw, but with the controller firmware as well, because I already tried to install older versions and the famous 4.3.0 version, with charging phone feature that I saw with my own eyes and had used it many times, and that option it's missing because the remote controller fw update as well.
The only solutions that dji give us for that are, or buy a iPhone or buy the
smart controller... It's unacceptable after wasting 1000€ on this ....
I'm very frustrated with that and I will not recommend dji to anybody, and I will never buy a dji product again.