I'm just now getting into this. I just bought me a Traxxas slash 4x4 brushless vxl that comes with a 2s lipo 5800mah 7.4V battery pack and the ez peak Id quick charger. I'm wanting to get another battery (probably another one of higher mah and V?) Not sure what brand would be best bang for my buck? Also I'd like to get the cooling fans for both my ESC and motor. Would this be necessary if i were to be running (2) 2s battery back to back? Or would the cooling fans be more for a 3s lipo battery? Also, what CC and V should I buy my batteries in?