Couple of caveats-
[I HATE I can speak authoritatively on this]
Power lines: when flying out of LOS, altitude is an essential parameter. These things run in the most unexpected of places, but a bridge over water is almost a definite place to find them. You will not see them first through FPV. This is a drone pilots addendum to Murphy's Law.
Battery ejection: only with sharp impact, hard surface, and battery can be "thrown" some distance. Batteries are, however, quite tough, and I've not lost one to such ejection, though have been and continue to be leery when charging, using. (Careful eval with DJI Go App battery section with every use/charge)
That I've not suffered loss of bird is adherence to above. That my first P4 is now my crash test dummy is testament to the "when, not if" nature of pushing the envelope. Landing gear are extensively taped & glued, and video transmission is iffy. But she flies and paves the way for the princess, my newer bird.
I'm NOT careless. But even with suitable paranoia you're going to learn, and education can come at steep cost. And here's an important lesson, the important lesson. If you're not prepared to lose/replace your baby, don't take off. No matter how paranoid, careful, $hit happens.