Pre-requisites:
- A power bank with wattage of laptop's charger (around 65W)
 - usb C to usb C fast charging cable
 - A laptop supporting usb C charging
 
A set of laptop charging pins with usb C power delivery cable
Connect the usb cable to laptop (or the appropriate charging pin for laptop, then other end to power-delivery cable, and usb cable). Then connect the other end of the usb cable with power bank.
(usb c charging)  | 
charging with a compatible adapter pin  | 
If you use a set of charging pins, same set of equipment can be used to power on a LCD or LED TV, and a router as well.