This is what you want. It clips onto your 1/2A glowhead and plugs into your Ni-Starter:
http://www3.towerhobbies.com/cgi-bin...?&I=LXBWL9&P=7
They work as good as anything else I've tried.
I put heavier wire on mine and a Deans connector. I use two Sanyo 1300mah SC cells in parallel and it lasts all day between charges.
David