Rusty thats why I said I'll let you know how it goes with the 4700 mah pack. I don't know what the weight is on my Typhoon but since I painted it and put the new 70mm fan in it just does not glide as well as I remember it gliding when I first flew it. Don't get me wrong I think it flys well it's just seems to come out of the sky a little faster and I have to add power right before she touches down to get it to flare. But I'm new to ducted fan planes so my opinion does count for much.