Just read a post where the user was using the same battery as me, hyperion 4s 45c 3300mah, and was getting 20 minute flight time with 8" props on the f450 frame. I'm using 9" graupners with t-motors , so I'm a little optimistic Ill get a solid 10 minute flight time before the voltage gets too low. I'm am gonna put some fpv gear on the f450, vTx and antenna, 35gram camera, 460mah battery....hopefully I'll still get 10 solid minutes.