The Fuel Rods people are usually on site (if not that particular park then somewhere else at WDW). The machines monitor how many charged fuel rods remain so they know where to send the person to refill. If you get to a machine that is empty, you can try calling the tech number on the kiosk. They can remotely activate it and even if they don’t have any plain fuel rods left, they will probably have the intro kits, so the technician can virtually get the machine to dispense one of those instead. The rep I talked to also said if you ever have an issue with the charging cords you can call in and they will dispense a whole new kit with replacement cord (I had broken mine when I jammed it into my pocket and bent the metal tooth, so ended up buying a whole new kit and she said that was unnecessary)!
I, for one, am a huge fan of the fuel rods. Just so much easier than remembering to charge my other mobile chargers, and if you’re in a group, easier than carrying around multiples.
For me, my phone not only gives me access to
MDE and wait times, but it’s my camera and watch and just my way to stay connected with the world outside Disney! I get that some people can just turn it off and not deal with it (my mom is one of them), and at times I envy them, but I honestly feel lost without it! When I had broken that charging cable I knew I needed to get a new one rather than deal with my phone dying.