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.

Change the connectors to match the radio you are using, just make sure that you get the wires correct.

There is already an adapter to plug into my radio.

I figured it out last night, the 4 pin plugs in the leads from the mains.