Nominal cell voltage is 3.7 V for LiPo; a 4S pack has a nominal voltage of 4 x 3.7 = 14.8 V.
Selects a typical power-per-kg figure for that drone class. You can override it with the custom amp draw field below.
Aggressive flying, high speeds and wind all increase power draw well above the hover figure. The style multiplier converts hover time to realistic flight time.