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Just about lost my cal5 today. Checked battery before flight and it was fine. Flying FM, went bonkers about 10min into flight, low battery. I must have a servo stalling but dont notice anything obvious. Running cheap fut 9001, 4200mah batt, gy401 set to 51%. Tail is not binding or anything else I can see. Not running ccpm wondering if the 9001's dont have enough torque and are stalling, just normal flying couple loops rolls but no heavy 3D.