Hello,
So I think i'm going to buy phantom 3 pro used one. The man told that it was staying on the shelve and it was rarely used ( bateries cycle: 2, 7 ) . I can come and test it, fly it. What should I look for when buying used drone? What's the main problems that Phatom 3 series ( pro ) has in drones and what to avoid? How to know that it was crashed?
P.S. It still has warranty, but really I dont know what it covers, as warranty can say that you crashed it or etc...

And how to check how much did phantom flew in total?