Battery-powered IoT projects require you to monitor your battery's percentage. Measuring battery voltage is not ideal, because the voltage doesn't drop linearly.

Fuel gauges are a better alternative. They work straight away, don't consume power while in standby, and they're accurate without any calibration!

Buy a Battery Fuel Gauge from DFRobot:
https://www.dfrobot.com/product-1734....
(They kindly provided me with this sensor)

⚡️Other videos in this series:
   • ESP32 + Arduino  
(Everything you need to know about programming the ESP32 by using the Arduino Framework)

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