I am in the starting phase of building a fairly large octo-copter drone. I am currently thinking about the possibility of powering my octo-copter design using 4 separate batteries where each battery powers 2 motors each, in order to get around the problem of the large current that would pass through the single central line (causing heat and voltage drop etc.) if I where to connect all batteries in parallel.
For sure there would always be a slight voltage difference between each battery and if you keep flying for too long you are gonna get one battery that runs out before the others, but I am theorizing that it shouldn't really matter as long as I make sure never to completely exhaust any of the batteries. The flight controller should compensate for the lower voltage provided to each engine. That is my theory at least. I saw a video of these guys doing the Hobbyking Beer-lift challenge with a really large drone, and they seemed to be using something that seems to be 4 separate circuits, one for each motor. Has anybody done something similar to this, or have any experiences about if it's a good idea or not?