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Getting the ESP32 to monitor its own battery level - XTronical
Tweaking4All.com - Arduino - Controlling a WS2812 LED strand with NeoPixel or FastLED
Build a Battle Bot Controlled with a PS2 Controller - Hackster.io
Powering Arduino With a Battery (with Pictures) - Instructables
Simplest Battery Power to Arduino Nano Solution ? - Motors, Mechanics, Power and CNC - Arduino Forum