Radio Controlled Helicopters

i have an rc chopper. when i charge it and start it , after reaching a certain speed , the blades stop and the heli says the battery is low . but if i continue spinning the blades below the flying speed , the battery does not does not discharge. WHAT IS WRONG ?

It seems that at the higher speed something is making the battery short out. Check the contacts and pay particular attention to where the blades spin when it is going fast. Something is touching something it shouldn’t touch to make the battery short out and discharge.