The need, The Need for LiPo speed

If I had to opportunity to run dual packs in series, I think that I would go with two trakpower 4900 packs for a 4S setup running a mild motor for racing. Something around 2000kv on the 4S should be a good amount of power that you can get to the ground.

Of course, the battery choice also depends on how long your races are.

What motor/esc setup do you have?