[coolhandcountry]

The advantage of parrellal is longer run time. If you run two 7.2volt 3800 packs you get 7.2 volts at 7600 mah.
The advantages of series is two 7.2volt 3800 packs you get 14.4 volts and 3800 mah.
You don't accually need the plug close to the esc either. That part is optional.