If the wire is disconnected from the Deans connector itself, then the repair is somewhat trivial.

Ideally you should use a 25 watt soldering iron with good low temp solder.


Place a new sleave of hit shrink onto the wire first. Make sure that the heat shrink tubing will cover the soldered wire and the connector stub.

Move the shrink tubing as far AWAY from the end of the wire as you can... e.g. all the way to the battery if possible.

Heat the end of the wire and "tin" it by applying a bit of solder until it flows onto the wire.

Do the same for the remaining connector stub.

Now heat the stub ( you need THREE hands for this, or a helper vise/clamp... ) and hold the iron against the stub to keep it hot.

Put the tinned wire on the stub and hold both the wire and stub together along with the iron until the solder from both "flows".

Remove the iron and with the wire immobilized temporarily, let the wire and connector cool.

After 20 seconds the wire will be firmly attached to the stub. Let things cool further.

Once the connector is cool to the touch, slide the heat shrink tubing over the area you just soldered.

Heat the heat shrink tubing with an air dryer until it grips the soldered area.

Let cool.

Done.