Cool, the reason I say I want to stay with 9s is that if I get 3s packs then i can use them in others things and have lots of combinations also my charger only does 9s and I just bought it so I dont want to replace it again . Yes and I was thinking ofr getting the tp 4000 prolites and running 3 of the 3s in series. I have the 4200 packs that are a little older and they have been good to me.