I have a slash 4x4 had it 2 months Bought 2 extra batteries as reccomended by lhs when I bought the truck. All 3 batteries have same run time all are 8.4 nimh, traxxas is 3000 mah extras are 5100 mah. On a fresh charge the Traxxas battery seems to have alot more power than the aftermarket ones. Is the Traxxas battery that much better? How big of a quality difference is there in batteries? Is it a you get what you pay for?