After years of being out of the rc world and selling my nitro SS my son is really wanting to get into the bigger stuff and I'm not doing nitro at least right now, my questions are what battery's are a good option that aren't $700 also for the 6S that would be 2 3S battery's or something else and what voltage is the max on both or 1 battery. I'm still learning the new LiPo world of things.