How many batteries do i need

Im building a esk8 with a double motor setup using these Flipsky 6374 190KV 3250W BLDC Belt Motor Sale - Banggood USA ad was thinking about using two of these in series https://hobbyking.com/en_us/zippy-compact-8000mah-5s1p-30c-with-xt90.html is that enough or should i get more than two of those batteries. and should get a BMS for them

I’m not familiar with lipos unfortunately. I can say I think its fine with 2 in series since it’ll be a 10s, but once again I’m not a brainiac when it comes to lipos. Especially with c ratings.

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and do you think 8000mah will be enough for a 10 mile ride

That would depend on the conditions of your environment to be honest.

I think you can get a 10 mile ride, but i would double check with the esk8 calculator.