The Aeronautical Engineering milestone introduces the Battery production line. Batteries are primarily used by drones as their fuel source and hence why you need to create a battery factory.
Drones in Update 4 are a great way to transport resources across the map. However what if you wanted to transport from a remote location that does not have any power?
Easy, just use packaged fuel delivered to a drone port at that location and you can unpack it and use it to power fuel generators which in turn will power the drone ports and miners/extractors/packagers.
This video shows you how to do exactly this from the new Impure Uranium node added to the top of the mountain at the highest point of the map.