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 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)