10XL on an e-maxx 5 or 6S lipo?

[TheOne]

One last thing(hopefully). If I wire the two 3s packs in series to give me a 6s pack, how would I charge them if they can only be charged together in parallel? Do I need to make a second harness and have extra wires? If so, will the unused connectors cause probs while charging?

Another thing I'm not quite grasping is what gives these BLs that long runtime, voltage or capacity? Cause I'm bout to buy a setup that puts out 22.2 V when in series but only has 4000mah capacity. Would I be making the right move in getting some MaxAmps 6000mah or 8000mah 2S2P 7.4V packs to make 30 min of runtime, but only making 14.8 V? Will the voltage loss effect my performance (mainly speed) a WHOLE lot or will it be barely noticed? I still have gearing to consider also.

I am trying to get every Q I have out of the way. Thanks for the help. A thousand times thank you.