I'm looking at buying a used Typhoon H. Comes w/ 3 batts, backpack, 3 sets of propellers. Asking $500. The back story is that it was bought a little over a year ago as a present for a son. Father claims they turned it on indoors, but the son thought it was too complicated so it has never been flown and has sat in the original package since. It's about a 2 1/2 hour drive to get there and before I make that effort I thought I would ask for some things I should be considering. The firmware would need to be updated but I think my biggest concern is with the batts just sitting there all this time. Thanks in advance for your thoughts.