Use our phones a lot. We use to take pictures and we are FP+ constant refreshers.
- Carry a battery pack. I get about 3-4 full charges out of mine.
- Buy a FUEL Rod in the parks (DS has one). Each day we swap it out for a new one. At first I balked but it's great knowing you can always get a fully charged one. He said he can also switch it at other spots including airports too but worth it just for Disney.
- Always have a cord and plug in bag to plug in at places around Disney whether the stations in Tomorrowland or a wall plug while I'm have dinner somewhere.
- Put my battery on "Low Power Mode" and that saves lots.
https://www.digitaltrends.com/mobile/best-portable-battery-chargers/3/