Very sad to hear anyone losing their bird. I've had 4 DJI batteries die exactly the same way yours did. Battery 100% charged to start and all of a sudden rapid discharge and early landing. I keep my battery posts very clean, even the female terminals on the battery. Use 400 grit sandpaper folded to get inside terminal. Still had early discharges.
Probably nothing you could have done Lew that would have saved your bird other then flying in a different location. That is easy to say when its so much fun flying over a beautiful area like yours. I was lucky with my early landings in the desert. I had to much confidence in these aircraft before the battery problems. I no longer fly anywhere near people, roads, buildings or water.