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Some people appear to use a USB power bank for this purpose:
which links to some further discussion at:
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I prefer LiPo - they are generally less prone to exothermic reactions. LiFePo are also good - they are more tolerant of less-than-ideal charging scenarios.
As I am working on my project i realised that every time there is a power outage or i accidentally take off the plug of my power supply i need to reset my raspberry pi Zero W which is my MQTT broker. So i looked on the internet and found some Raspberry pi and Arduino UPS but they are expensive .... The cheapest that i found was about £45 so i decided to build my own....I found some schematics and components but the only thing that left are the batteries. In the beginning i thought to go with 3-4 (18650-Li ion) in parallel and a voltage booster but then i saw some others using LiPo batteries. So my questions is what type of batteries are best? Li-Ion or LiPo Batteries? Or are there any others better?