Powerbanks charge normally via usb, for smartphones and tablets is fine. It becomes harder if you are on the go with your laptop to charge, this is often dependent on a traditional outlet.
The AC Power Bank is Brick of Xtorm now provides for this need. This is a plug in for recharge at 220 volts. According to the manufacturer, portable battery charger are also well suited for drones and cameras.
The capacity amounts to 20.800 mAh. There are also two usb-a and usb-c port. The suggested retail price is 179 euros.