I noticed recently my HBFP doesn't have the same power, no lift. At half throttle it's up but after that no power. I held it my hand and noticed the red LED goes on after half throttle and as I back it down to half throttle it's green? What's up with that? I'm going to change the motor, waiting on one. It didn't act this way before, I had plenty of lift. Battery voltage at 4.1, both cells. Is the LED suppose to turn red at a little over half throttle? Seems like it has no more head speed after half. Thanks for any input.