Question about Anker PowerCore

Basically anywhere you can plug in the USB cable. On the iPhone plug, USB port on the notebook, USB port on the power strip if available, etc. Connect the micro USB plug to the power bank. But depending on the output power, this can take more or less time. My adapter supplies 2A at 5 volts. It works relatively quickly there.

You probably have too little power. It will certainly go a lot longer. You can read about the output power and the required power. I'd have to look for that too.