I know this will have been covered before but this amazing forum is so huge I cant find what I am looking for. Even search doesnt help. I was using one of my batteries today - said there was 7 mins remaining. Then about a minute later it showed 0 mins but the level bar was still almost halfway across. I came in to land pretty quickly - by then the display was showing 1min. after landing there were still 2 green LEDs illuminated. Why does this happen? Is it safe to just look at the battery display bar? Cheers.