are they 2s or 3s LiPos? it doesnt really matter what brand. the traxxas EZ peak charger would be a good one. one that will charge dual LiPos will make you happier cause u basicly can kill 2 birds with 1 stone.
Duratrax Onyx dual LiPo charger
the thunder charger is really good, and pretty cheap considering the amount of extra adapters you get in the box. so you could buy 2 of them.