After seeing the new cases for the battery case and not knowing where to buy one, I realized I can just make my own. I made two versions of the box one has a flat top where you can use your tape of choice and make a hinge, and the second version uses two clips to hold on the lid. Warning: This case fit snuggly and may cause scuff marks on corners.

Printed on a replicator 2 @ 5% infill - low Quality - no raft/support