Flight time is around 10 - 15 min depending on how you manage the throttle. You can get bigger wheels from any hobby shop, but they're not going to help much. The super cub (like many park fliers) will just nose over if you try to take off from grass. You'll either need to hand launch it or take off from pavement. As for batteries/chargers, I'm sure someone else here could answer better than me. I've been buying them from the LHS. Since the receiver can handle both nimh and lipo's, there's a LOT of places out there selling packs that you can use.