Ok thank you very much .. I will put a little more heat on them other than room temperature...I feel we will have a lot more cold weather here in va.. so i will give that a try.. again thank you very muchThe trick is to keep the aircraft in the batteries warm before the flight, I flown my H down to -25 degrees Fahrenheit with 18 minutes of flight time per battery, transmitter actually gives you more problems at those temperatures then the aircraft, LCD screen starts to skip and the controls become slow and hard to move around.