I have been flying the EF Extra 300 for 3-4 years. I can do two IMAC Intermidiate schedules using 5000 mah. I am using CC ESC and the Hacker A60-7S V2 motor. I recognize that it would be better to have more capacity. However, I just ordered the Throttle-Tech (T-T) for this plane. I have been using the T-T in the pattern planes with very good results. I predict that using the T-T it will be no problem to complete two IMAC schedules with one 5000 mah battery. This is up to intermidiate schedule. I am not sure for Advance and Unlimited.