Hyperion and zippy
 

I just ordered a hyperion duo and 2 4s zippy lipos. Will the zippy balance plug work with the hyperion duo or do I need some type of converter?

Zippy lipos come with an "Align" type balance tap plug, you'll need an adapter. I used this: http://www.maxamps.com/HYP-MULTI-ALIGN.htm

If you have the Hyperion charger its worth picking up these three adapters.

http://www.maxamps.com/HYP-MULTI-HYP.htm
http://www.maxamps.com/HYP-MULTI-TP.htm
http://www.maxamps.com/HYP-MULTI-ALIGN.htm

You can basically charge any of the popular lipos with those three adapters. The Kokam adapter really is only worth getting if you live in the UK or Germany.