Hi Scott,just recently while flying my parkzone mustang,the motor began stuttering, on landing I checked the battery and it was way down and a long way out of balance.This happened twice to fully charged and balanced turnigy nano tech 3s1300s,They obviously don`t like winter flying.The fact you had some control says to me maybe it was`nt t rx just low power.Unfortanely the battery will be beyond checking.I`ve now learnt that in cold weather shave a few minutes of your normal flying time,cheers Paul.