Thank you both for the quick reply! I will give it a shot, it would be better for me to let him drain the battery on a different device than the one I will rely on in the parks. I’ll plan to bring a power bank either way.
Have you downloaded the MDE app to the phone to ensure the phone is not too old? I had to upgrade my iPhone 6 a couple of years ago because the MDE app would not load the current version to the phone. So long as the most recent update works on the phone, you should be fine.