Reported by Retrobiker in the community forums:

* https://gurce.net/oldforum/146-power-mini-from-powered-usb-hub.txt

Reported by Mark Bush on fb group page:

1A is only enough to operate the Mini “as is” with the built in games. To do more, you need more juice. 2A is recommended if you have a keyboard or USB stick pugged in. 

I use an Atolla hub. It has a 3A charging port which is more than enough for the Mini and is also a powered USB hub. Works great. 

* https://www.amazon.co.uk/SuperSpeed-Transmission-Charging-Powered-Extension/dp/B01FS9Q01K