Crafty, do you think that perhaps the H9 charger is just overcharging the batteries. W/ the A Cycle you give it the specific mAh and it charges accordingly. Try charging it with the A C, then check the voltage. then discharge. charge with H9 charger and check the voltage. I'm guessing that the H9 is just cutting off at a higher voltage. By the way, most good batteries have no problem with what I called "overcharging". I'd rather be able to fly longer at the field and replace the batteries more often anyway.