The battery wil last aprox. 2 - 3 tanks of 16 oz fuel (aprox 1 hour) but you can make 2 or 3 2 battery packs and replace as needed for a days flight, besides the pack doesnt weigh much if you use NiMhi batteries.

As for Antiques question Amsoil will not mix very well with E85 alone thats why I use 60% regular gasoline with 35% E85 to make oil mixing easyer otherwise you will need CASTOR oil to mix with the E85 fuel/Nitro by it self.