3.7V Lithium battery as power supply for the DOIT ESP32 DevKit-v1 · Issue #1377 · espressif/arduino-esp32 · GitHub
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ESP8266 ESP32 Power Supply Rechargeable Dual 16340 Lithium Battery Charger Shield Module Dual Output 3.3V 5V for Arduino R3
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esp8266 - Li-ion charge / discharge circuit with ESP32 and MOSFET - Electrical Engineering Stack Exchange
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