You want:
One of these:
http://www.ebay.co.uk/itm/8064-RC-4m...UAAOSwQYZWxHfD
And one of these:
http://www.ebay.co.uk/itm/JST-XH-RC-...AAAOSwYHxWHzXS
Job done
Daz.
Or you can skip getting a board and get the balance lead itself to fit like so by skimming off one if the little lugs on the plug making sure you get the polarity correct:
