I ordered a battery pack for my Samsung S8. It took about 10 weeks to arrive. I needed a battery backup when travelling overseas, so I actually had to buy a 2nd one from another supplier because the Punk Case one had not arrived in time. (It arrived 4 weeks after I returned from OS).
When it did finally arrive it was faulty. I know this because the 2nd one I bought (which btw arrived in 1 week from Aus Power Banks) is identical and only cost a few dollars more.
I have contacted Punk Case twice now with no response. So I am $70+ out of pocket but I do have a handy door jam.
I would not recommend Punk Case at all. Spend a few extra dollars, get your product from a local supplier. It seems they are all made in the same China factory anyway.