Hi McDaddy2U,
For your first question, we recommend checking out the information below which should help:
MagSafe Battery Pack was designed to attach directly to your iPhone or through a case with MagSafe. If you use any other case that holds items like credit cards, remove them before charging with your MagSafe Battery Pack.
That information and more can be found here: How to use your MagSafe Battery Pack - Apple Support
As for your second question, it appears you are wondering if the Smart Battery Case is available for iPhone 14 Pro Max. If that is correct, there is not a Smart Battery Case that is available for that iPhone model. You can see all available accessories here: Apple Accessories for Apple Watch, iPhone, iPad, and Mac - Apple If we've misunderstood your question, please let us know more details so that we can do our best to help.
We hope that information helps.
Take care.