I started out with glow engines 30 some years ago and I 'love em', Batteries are nice and clean but as a few people have said you need 4 batteries at least to do any amount of flying time and even then your busy running back and forth to put it on the charger. I have a couple of electrics and I had to spend over a $100.00 to get 4 batteries for just the one FMS Spitfire I have. I live about an hour away from the flying field and I want to spend all day there so the batteries do not work for me very well. Thank you, but I will stay with the Glow Engines!!