Universal battery connector

I designed the first universal battery connector in the world that can be used for all batteries. Not all of the batteries, but most of all in fact. You can connect from AAA, AA, C, D, 18650, batteries together using this small connector. Use the magnetic rod, you can do a lot of interesting works. Hope it will help you a little. Have a good time. Keep safe.

Detail information on Youtube：
https://youtu.be/YquqSwl72ls