Ya with that combo we have guys run both 3 cell and 4cell. I would recommend 4 cell for these reasons:
1. when you want more speed its there
2. if you dont want that speed just turn down your travel to 75-85% of full and it behaves like a 3cell giving your motor lower voltages (best of both worlds)
3. If you change motors later and go to lower kv then your already set with 4cell batteries and dont have to stock pile both types (money waster)
4. 4cell will run cooler than your 3cell which will be more critical in the summer months to come
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