Later this week the Magic Kingdom will be testing mobile phone charging lockers for guests use.
The secure lockers will be located in Cosmic Ray's Starlight Cafe and the Tomorrowland Light and Power Company, and will be available for use free of charge.
To use the charger, guests will swipe a credit card, which acts as an ID for the locker. The chamber door opens, and inside are a number of charger cables. The phone gets hooked up, and the door closed. On completed charging, the door glows green. To open the chamber, the same credit is used again.
Charging station are already available in the Magic Kingdom, but they require the guest to remain in place as there is no method of leaving the phone unattended. The increased use of My Disney Experience and reliance on guests own smartphones as park of the park experience appears to be driving Disney to helping guests remain powered up.
You can see the system in action at the manufacturers website.