fast-charging QC4 power bank

requires a charging chip with temperature monitoring and an 18650 lithium battery. costs for both start at €5.

emergency power bank - charges devices with up to 22.5 watts. (supports PE1.1, PE2, PD2, PD3, QC2, QC3, QC4, QC4+ etc.)

print the parts, solder two wires to the circuit board and the battery, insert the parts and button into the housing, put the lid on, and screw it in place with M3x5-6mm screws - done!
be careful when inserting the circuit board. depending on the workmanship of the circuit board and the soldered components, the housing may need to be reworked slightly. also test whether the button can be pressed noticeably.

examples of the circuit board on aliexpress:
https://aliexpress.com/item/1005005652017354.html
https://aliexpress.com/item/1005007076495645.html

(when the red light is on, fast charging is active)