i know he said this but it took me forever to figure itout. when the batter starts gettting weak it will start to spin, and i'd reset the trim. then i'd charge the battery and it'd be all out of wack. and about the time i got it adjusted the battery would be weakening again. so it's very important to set on a full battery and dont freakout and re adjust if it starts spinning toward the end of battery. if it's that low you probably need to recharge then anyway.