; Date: June 2, 2019
Why should commercially made power banks be so expensive and so small? This DIY powerbank can be built by anyone at a fraction of the price of commercially made power banks. This unit can power not just USB devices, but 120 volt AC devices, it charges over USB or USB-C, and contains voltage displays. This plan reuses a lot of commercially made components. What makes it work is some highly customized 3D-printed parts from which the case is built.