Hi guys I know that there are a lot of posts related with this, but I didn’t see any with my requirements.
I’m using a ESP32c3 super mini because is super mini haha. I’d like to power with a small battery li-ion of 500ma. It works without just connecting in the +5v, but I wasting the 90% of the capacity. When the voltage drops the esp don’t work. So is there an easy and super small way to solve it. May be a booster and charger board but have to be super small.
Look for a power bank chip that has charger and 5V boost converter combined, for example TP5400.

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You should have bought the XIAO ESP32C3.
Same processor, but with LiPo battery connection and built-in charger.
Leo..
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Sure that will work, just search the internet until you find the size you like.
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A Li-ion charging and boost converter module can provide a stable 5V output to the ESP32-C3 while efficiently using the battery's capacity. You can use a TP4056 Charger Module with Protection and a Boost Converter (MT3608).
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It could be an option. I'll check it
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