I think (maybe) is to take 19V laptop adapter, this is good simple solution for this issue, the only thing you have to do is replace the charging plug.....if needed.
These are the published specs for the battery charging hub:
Model: WCH2
Input Voltage: 17.3–26.2 V
Output Voltage and Current: 8.7 V, 6 A; 5 V, 2 A
I have HP laptop adapter 19V 90W so intent to use it as soon I'll received the CS