Went for first flight after successful update of two remotes and 3 batteries. Got a shock when I got the message 'Lowering landing gear and critical battery' when the battery was reading 60%. Managed to get it back ok so I turned the bird off and then on again , the message or warning never reappeared. So I don't know what that was all about. Interestingly, I decided to run the battery right down to zero so I hovered the bird in front of me only a couple of inches high to see how long the motors would keep turning at 0%. Just under 5 mins flying at 0% battery !