I bought 4 of the batteries for my hubsan x4. Have additionally one better get the shipping cost problems as a small gift for the purpose of furnishing. I'm very satisfied with the batteries they do what they should. Pro Battery good one and a half hours then he is ready for biting At 11 minutes of flight time, would then be with me just over an hour flight time what really sufficient. Every recommendable who also would like to see more like 11 minutes that feeling of weightlessness.