I have this one, it charges up to the QC 3.0 standard, and it's fairly compact. (Though I've only used it twice with my S8+...)
https://www.amazon.ca/gp/product/B0...hawk-future-ca-20&ascsubtag=UUacUvbUpU5956624
To my understanding, the Note 8 only uses QC 2. All power banks that are QC 3 are backwards compatible, but will charge at QC 2 ON QC 2 devices. I use the 3 on my Note 4's, my Samsung Chromebook Plus, S7E and a rash of other devices. It works perfectly on all of them!
The Note is using Samsung's proprietary fast charging which is compatible up to QC 2. This I think is because Qualcomm has doesn't allow QC 3 on othee chips and Samsung wants the same thing on their Snapdragon and Exynos phones.I'm going to have to look into this. I was under the impression that the Note 8 used QC 3. Thanks for the information.
I bought this and it works pretty well. Samsung East charge portable battery pack 5100.
https://forums.androidcentral.com/e...%2F5806008.p%3FskuId%3D5806008&token=_Ihn6DUb