For lifepo4 battery its imperative to get the long life to have a BMS which has each cell with a signal wire I use 3.3v 12ah cell so for say 24v thats only 8 signal wires ( this called 8 S BMS ) but there again must be say for 500w -700w motor divided buy 24v = ? amps that the size BMS or they go pufffff or cut out up the hill,.