DIY Power Bank! From the trash at hand!
I have collected a certain number of old batteries from screwdrivers and old laptops. I bought a couple of controller boards to assemble power banks. Then everything is simple, we collect the most "live" batteries, connect them in parallel, and connect the board. Such a device often helps me out when the phone battery is discharged, and there is no outlet nearby, and besides this, there are also times when such a device will help out. Everyone will decide for themselves where and how to use such a homemade product.
#DIY #homemadepowerbank #doityourself #storage #lithiumion #charger