I have decided to sell my drone, it is an Inspire 1 v2 w/ the x3 camera. It was crashed once and I am in the process of repairing it (needs the front two landing gear pieces replaced, have the parts and drone apart just have to solder the new antennas in). I haven't flown it in over a year so the batteries I assume are dead. What should be the process to test them to ensure they're in proper working order to sell them? Also where is the best place to get current prices I should list my stuff at?