After about 25 cycles of babying my battery, I decided to fly until I got my first low battery warning. It was dusk outside and watching the H's lights is so cool. I took it up to 400 feet and flew west about 1,400 ft and then brought it back overhead and flew it 1,400 ft in the other direction. I lost sight of it at one point so did a RTH and I could hear the H before I could see it. Total flight time was 18 minutes, but the last 3 minutes was very slow flying and hovering as I did not want to be far from home when I got the low battery warning. Battery was at 14.3v when I got the flashing lights on the H and the ST16 started vibrating. One of the things I also noticed is that when the H was hovering, it would drift in a small circle, maybe about 3 feet . There was a light breeze but nothing more than 8 mph. This made it a little bit of a challenge to land. I did not want to drag the landing gear. I let it get within a few inches of the ground and waited for it to stop drifting and quickly put it down. What I am beginning to see is that it is much better to land in an open area without any nearby obstructions. A safe landing is much more forgiving in case the H begins to drift.