So, I love our BM4k, Most of you know why=) One down side is it shoots about 30 minutes due to a small internal battery. Using reds in the past we used to use LIpo's for flying, can I do the same with my 4k? I have 5-7 3200mha 4s that should fit the bill. My thoughts were as follows: Wire a plug up that fits the 4k (it can take 12-30v), add a JST to the end of it. Wire all the bats up JST. Charge... fly... profit!