Trying to figure out what extra components I will need for a Revo GT500 charger or if I'm better off getting the GT500 Duo. I am looking to charge 2-2S 70C 5000 mAh gopacks at a time. From what I understand I will need 2 adapter boards like the SPA (JST-XH) daisy chained together and a set of stackable banana plugs for the GT500 but if I were to get the GT500 Duo I wouldn't need the extra boards and plugs. Does anyone have either of these setups and could advise me on the simplest and most cost effective way to do this?

Thanks,
Ryan