Just be aware of the off-brand battery cases. I sourced two from different vendors (one directly from China) for an S8 Plus and the case burned-out while I was charging it in July of last year; didn't hurt the phone. The designs are identical. I will not get any battery case for the Note9. When the Note7 came out I bought (and still have) a Samsung BackPack battery which boosted the Note7's battery, wirelessly. If there is a future for supplementary power packs it's wireless.