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Using 2S BMS to power ESP32 Board.

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htekin42

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Hi everybody,

I need to power up my custom design ESP32 board with battery. I don't want to design my own BMS. I have power input and need battery when power is down. I found a module called as FDC-2S-2 which is 2S battery charger. It only has power pins and battery pins. How should I connect it?
Thanks for suggestion.
 

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That is a battery charger, what you need is a voltage regulator. If you connect a fully charged 18650 directly to an ESP32 it will instantly be destroyed. ESP32 itself has a maximum voltage of 3.6V with normal working voltage of 3.3V but a fully charged 18650 will be at least 3.7V and while under charge even more.

Is your 'custom design' using only the ESP32 IC, a WROOM module (with a metal can and side contacts) or is it a pre-assembled module like NodeMCU ?

Brian.
 

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It is Wroom module but It has LDO for 3.3V. I know fully charged 18650 gives 3.7V and 2S will give 7.4V when fully charged. Thanks
 

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