This is just a question regarding all phantom series drones. has the battery level always been in the 20 minute area flight time for all the drone series, actually you don't get 28 approx. in flight due to take off and coming back. Is it due to the cost off the batteries that they don't or educate me. I only thought by now being this what series 4 now they would made the batteries last longer, ok thank you I just didn't no