On the batteries I run 3600 for stock, Good voltage (1.23's +) more than enough run time, they are lighter than the 3800 and up cells..and much cheaper. Work on your gearing, under geared and over geared motors get hot, bad on the brushes. Best Tip comes from
WheelNut "Also changing to a more conservative driving style will help reduce wear and breakage everywhere."
This tip will also make you a faster driver...