It is not but many guests don't have a clue how technology works or even that a MB does not store ticket data or any other data for that matter. They just think MDE that must use all my battery while at the park. It took a couple of years before the majority of guests were freely using MBs.Yeah, I honestly don’t see how there would be a problem with the battery.
The ability to still use your MagicMobile Pass when your iPhone is out of usable power is only limited to newer iPhones.“The pass works without waking up the device or using FaceID or TouchID, and can also work when out of usable battery life.”
You can use Express Transit cards with power reserve with iPhone XS, iPhone XS Max, iPhone XR, or later. Power reserve is available for up to five hours when your iPhone needs to be charged.
Dave