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

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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: http://s.click.aliexpress.com/e/OZupkNK or http://bit.ly/2RbEP1h
USB Tester: http://s.click.aliexpress.com/e/by2eDXAo or http://bit.ly/2FNp1ch
Good Li-Po Batteries: http://s.click.aliexpress.com/e

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Universal Power Source (UPS) for only 2$. Is this possible? (Raspbery Pi, Arduino, ESP32) Universal Power Source (UPS) for only 2$. Is this possible? (Raspbery Pi, Arduino, ESP32) Reviewed by Unknown on January 05, 2019 Rating: 5