My battery bank has several mm of metal for the casing.
I promise it makes a difference. I've dropped it several times and the things it was dropped onto took more damage than the power bank did.
Dunno what cheap ass shit other people are buying...... Clearly stuff that can be penetrated by a dog gnawing on it.
You'll get no argument from me.
When mine stops holding a charge, I plan on opening it up, finding new, equivalent cells, and building a new case for it around battery holders for the cells. I'm 98% certain I have cylindrical cells in mine.... So some 18650 or 21700 cell holders, cells, and just wire it in to the same controller board and slap everything in a case with some padding to keep it from moving around.
That way I can keep using it until the controller board dies, and even then, I can later replace the controller board....
It's my long-term plan to build and maintain my own power bank.
It will be encased in metal.