18650 <--> Li-Ion Pouch rechargeable batteries adapter

I wanted to test some pouch cells to better understand their capacity. You could charge your pouch batteries via 18650 charger, test pouch batteries, or (given the room) run an 18650 compartment with a pouch Li-Ion.

These are the end pieces, I prefer them over the spring type and use them for adding batteries to my projects. Single port of course.

This is my battery tester that I've been using and shown in the pics

Use at your own risk of course, don't be dumb. Wire correctly, double check your work and ensure you put the correct end in the correct way!