Amperage and MAH how is it doubled ?

[SpeedAssault]

[[[ First I would like to Say that all you guys are really nice to give your time and help on this and it is greatly appreciated.

? ? ?My SETUP. please tell me what you recommend from your experience and if you could tell me how to do the math.
Custom 4wd 1/5 car (9.lbs no battery), Losi 43/13 ring pinion with a losi 2.0 CD but locked with a 45s/16p, locked rear, 5" tall 1/5 scale FG street slicks and working on a way to swap wheels out for very mild dirt 3.3 tires (4.5-5") for hard pack rally driving, but mostly street stunt, bash drifting , CC Mamba Monster /2200
want 45-55mph and 20 minute minimum runtime ? ? ?

[Quote reply]
oh ok, I get it, it was about being a constant draw.

I'm not sure whether to go with a 2s and 3s in series or just Two 3s in series.
But I like the idea of split weight.

I was shopping for Batt, one site site listed it's C rating and the other site only listed is constant amperage of 75, at the time I did not know how to calculate to see if they were the same and also one battery was a EP and the other did not say and I was going to put them in parallel, by the time I got the answer the 2nd batt was also a EP he told me I should run a NP .So this battery shopping has been a Long confusing deal.

Here;s the lipo's I was looking at :
NeuEnergy 5S-1P 2500
NEU2500EP 5S1P V1 -->http://www.neumotors.com/Site/Battery_Info.html
But I have read and heard that its best to run in series
So it's either a 2s and 3s in series or Two 3s in series