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I have an 60 v 250 amp 6-14 s esc and was wondering if using "3" 5 s batteries in series at 55.5.volts would work with the esc. Do they require 6 cells minimum or do they simply reqire a certain voltage ?
Your 3 x 5S in series is 15S totalling 63V and will likely blow the ESC as it is only rated to 14S. It will require 6S minimum.