Only 20mph? According to esk8 calc it should be able to hit 25mph. Is it because of the discharge rating? I will bypass this in the bms btw. I dont think I want 5x 2s lipos, because it will take up alot of space, and is more expensive than just buying 2x 5s lipos. Im not sure how many people who have used bms with their lipos tho.
You might hit 25, who knows. I have found that I usually come in at 80%. Lots of people have used a BMS with lipos, look at the links I sent you and search.
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Esk8 calcs do not take into consideration voltage sag. Using 5000/20C packs at 10s, you will have voltage sag that will reduce your max speed and range. What I recommend is a minimum of 60C at 5ah and even then you will have a small amount of sag. With 20C at 5ah you might also have issues with your packs heating up and getting puffy.
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Okay, thanks! But my wallet is obviously not as big as yours, and the 60c batteries cost a lot more. Still wouldnt want heated and puffy batterypacks. Mabye ill go for 30c. Or a 8s system instead. The thing is just that there are few people using 8s, and therefore few brick chargers with 8s (33,6v). And then have a matching charging port to that brickcharger etc. BMS too 
I use (and started with) 2x 5s 5000mAH batteries (20C) and I have found it fine. I’m a bit careful/timid on my board (can’t afford to crash) but go up some hills while commuting.
I generally cruise at about 22km/h (I know that’s slow, but I’m not limited by the batteries).
I also have my motor current limited to 20A in the VESC setup (running a 5035 125kV motor)… more than enough for me.
I would only change the setup for size/stealth/asthetics reasons.
Nice dude! What discharge rating does the batteries have? 
Updated post. 20C…
Thought they might be a bit low (in the month and a half that they took to get here) but I had nothing to worry about.
motor current isn’t decided by the battery. only the “battery amps” are true amps coming from the battery. So you could set your vesc to have a miniscule 20 battery amps and 120 motor amps and still only pull 20 amps max from the battery yet still have great low speed torque.
Totally. I get that. I figured that there would be some capacity stored in the VESC and tutorials I had seen suggested doing the limiting at the motor rather than battery.
I wanted to dull the acceleration for a while as I learn how to ride the board with motors.