I bought a used Pica Duelest, that has a set of Kraft electric retracts in it. The retracts and the control unit are there, but the battery is missing. It has a four pin connector with two black and two red wires. I assume the reds are positive and the blacks are negative. Anybody have any input that might be of help ? I can fly the bird with the gear down, but I would like to use the gear.