Note: this would also work with any CYD project not just the xtouch

I remixed this design as i wanted to fit in all the required electronics to power the screen from a standard 18650 battery. This design is really nice as you have two different angles you can have the screen at and just need to flip the orientation in the screens settings.

I used parts i had kicking around you could get a smaller switch:

usb c connector: https://www.aliexpress.com/item/1005005673073529.html

switch: https://www.aliexpress.com/item/4001165677485.html

usb battery charge protection board: https://a.aliexpress.com/_mK2gBnE (you could design a way to use this as the charger port but i prefer the surface mount port)

Assembly: use 4x12mm M3 screws to secure the front to the back, these just screw into the plastic on the front screen so don't over tighten.

I have add in a wiring diagram and close up of the wiring for any one who might not understand how to put this together based on some questions asked.