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Originally Posted by Wittenborn
Now I must add a question !!! what i the diference between the 2S2P and 4S2P - I´m not sure I understand this Lipo thing - all the different types...
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S means series, P means Parallel.
As you prob already know, putting batteries in series adds their voltage. Putting batteries in par. adds their capacities. So if you have 2 3.7V 2000 mah cells:
2s: 7.4V, 2000 mah
2P: 3.7V, 4000 mah
An important parameter on lipo batteries are they discharge current capacity, rated in terms of C. C is a multiplier to the capacities that gives the max amp draw.
EG: Same cells as above, rated as 10C cells
2S: 7.4V, 2000 mah (2 Ah), 10C=> 20A max discharge (10(C) * 2 (Ah)= 20A max)
2P: 3.7V, 4000mah (4Ah), 40A max discharge
Thus, you buy lipos in combinations that will suit your motor in terms of voltage and amp draw. A 4S2P (3.7v 4000 mah 15C cells) battery will give 14.8V, 8000 mAh, and 120A max discharge (8Ah*15C.) A 7xl motor will draw ~100A, so that batt would be fine, but a 4s2P 6000 mAh 15C batt would be too low amp wise.
Obviously you can buy 2 2S2P batteries and make a Y-adapter to run them in series for a 4S2P battery if that config suits your usage better.