One of the things I hate the most is when you are in the parks and your phone battery dies. I have tried multiple portable chargers, but those seem to die as well. I was in Walt Disney World not that long ago and decided I was going to try the Fuelrod.
Fuelrods can be purchased at kiosks in the Disney Parks, Disney Springs and ESPN Wide World of Sports for $30. With the initial purchase you get the charger itself, a usb cord to recharge the device and adapters for most Android and iPhones. This is all yours to keep. While in the parks, if your Fuelrod looses its charge, all you need to do is visit one of the kiosks and exchange it for a fully charged one.
Each park has at least one kiosk, with the exception of Magic Kingdom.