Better yet, put a copy in each of your drone cases so you don't have to worry about remembering it. I also carry a copy of the FAA letter citing they supersede local and state law when it comes to airspace, along with a copy of the state laws (if...
If you want a glimpse of what American manufactures are willing to do to competition, regardless of foreign or domestic, read about the Tucker or watch the movie.
US law says manufacturer's can deny warranty claims if they can prove the aftermarket item caused the damage, such as creating excessive heat that causes component failure. On top of that, if dji denies your warranty claim, you will have to take...