Those batts are deffinitely a bargain. Im torn again as to what road to taking.I have been doing continuous research on this topic and have seen that the cogging problem could also just be my ESC. Apparently the sidewinder sv2 sport isnt all it's cracked up to be and may not even handle the 6900 cm36 motor it comes paired with(which is what i have). I dont know if i should just try an ESC that can handle the amperage my motor puts out, or buy lipos and a charger and fry the ESC all together lol. I wish i knew more about all this stuff....