3.7V Lithium battery as power supply for the DOIT ESP32 DevKit-v1 · Issue #1377 · espressif/arduino-esp32 · GitHub
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Witty Fox ESP32 Storm Board with On-Board Li-ion Battery, Wireless Programming, WiFi, Bluetooth, Dual Core Chip : Amazon.in: Electronics
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esp8266 - Li-ion charge / discharge circuit with ESP32 and MOSFET - Electrical Engineering Stack Exchange
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