I have a 4S 5000mAh battery on my hexacopter. What is the lowest safe voltage per cell before I risk losing power to my motors. I want to know in order to set the value on my battery low voltage alarm. Also is there a way to program this into APM 2 so that the copter will return home when it hits a certain low voltage?
I think if you look hard enough in this thread you may find an explanation