How to Use Dead Batteries. A Second Life for Dead Batteries
In this video, I'll show you how to make a DIY power bank that runs on 50 old batteries. This power bank will give your old batteries a second life.
A 3- to 5-volt converter is also an option.
http://ali.pub/226kq8
A 1- to 5-volt converter
http://ali.pub/226on0
A battery holder - the more batteries, the better.
http://ali.pub/226lfi
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