TS100 is my favorite mobile soldering iron.
It is small, handy and powerful but 6S LiPo battery which I was using to power this is not handy at all.
So I made this simple and cheap hack to power TS100 using power bank.

You need:
USB-C PD Trigger: https://www.aliexpress.com/item/4000124529027.html
DC CONNECTOR: 5.5mm x 2.5mm
Cable: USB-C USB-C
Power Bank: BASEUS POWER-BANK 20000 mAh (15V 20W)

You can use a better power bank with 20V PD and get more power but I already have this cheap Baseus one with 15V PD and it works very well.
You can also use wall charger with PD.
USB-C PD Trigger is 2.5$ adapter that triggers higher available power mode form power bank.
Use regular USB-C cable to connect it together. (Thunderbolt 3 cable is also OK)