I really appreciate all the good information. I do not want to push the envelope but When the voltage gets down some I was just wondering how long it is good to fly. I do have a hobbico voltmeter but it only tells you when it needs to be recharged. Let's say it needs to be recharged at 4.6v--but you get a green light at 4.9v. How long from 4.9 to 4.6 is the average time. I know that it is just a guesstimation. Thanks again