#250 Universal Power Source (UPS) for only 2$. Is this possible? (Raspberry Pi, Arduino, ESP32)

Uninterruptable power sources or UPS for your Raspberry Pi, Arduino, or ESP microcontroller usually are quite expensive and also do not always work. When I found these small 2 dollar modules, I asked myself: Can we use them as a UPS? Or are they just junk and false promises? Time for a closer look! From time to time viewers ask how they should power their projects, especially with batteries. Today we will take a look at this small module and find out if it is any good, how it compares with Power Banks, and where it fits in the “energy supply chain.” Links: UPS: or USB Tester: or Good Li-Po Batteries: Additional info: Supporting Material and Blog Page: Github: My Patreon Page: