I have a helimax mx450 with an Electrify Ammo motor and helimax 25A ESC. I have only gone through about 6 batteries on it and the motor now shudders pretty hard at low throttle and then just stops. Once it stops spinning I have to lower the throttle all the way down and then increase it to get the motor to spin again. I have taken it out of the heli so it still does it with no load. Any ideas?

thanks

i wonder if this may be the battery not being of correct size ! what are the specs on battery ma volts #c and does this problem happen tord the end of the flight ?!