I bought a used xxx-t cr and it has a GTB esc with a 10.5 motor. I have a battery question, should I run a 2S or should I be looking at 2S1P? Do I need more than 25C and 4000mah? I hate to ask which one to buy as brand preference/sponsorship usually will bias an opinion, but if there is by far a more popular pack I'd be interested in knowing what guys are running.