This is it. After reading and searching, I found a low priced power bank that does fast charging on the Mate 9. I bought it. I tried it. I'm taking it across the world this month.
Tronsmart Presto 10000mAh Ultra-Compact Portable External Battery Power Bank Battery Pack With Huawei FCP Fast Charging Technology
https://www.amazon.com/Tronsmart-10...ag=hawk-future-20&ascsubtag=UUacUvbUpU5835870
That's as big as it get but with some airlines, like BA, lowering their maximum allowed size down to 20,000 mHa, this will work.
If it fails, I'll be sure to come back and post that.
Tronsmart Presto 10000mAh Ultra-Compact Portable External Battery Power Bank Battery Pack With Huawei FCP Fast Charging Technology
https://www.amazon.com/Tronsmart-10...ag=hawk-future-20&ascsubtag=UUacUvbUpU5835870
That's as big as it get but with some airlines, like BA, lowering their maximum allowed size down to 20,000 mHa, this will work.
If it fails, I'll be sure to come back and post that.