lithium ion - Powering Arduino from Li-ion battery - Electrical Engineering Stack Exchange
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UPS Module 5V 1A 3.7V 4.2V Li-Ion Battery Charge Discharge Board for Arduino UNO MEGA2560 ESP32 Uninterrupted Power Supply - AliExpress
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How to connect a Battery to a Pushbutton so that Arduino can see when I press it, so it can light up an LED? : r/arduino
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Amazon.com: SDTC Tech 4-Pack 1/2/3/4 x AA Battery Holder with Wire Leads 1.5/3/4.5/6 Volt Battery Case Box Kit for Arduino Project Led Circuit Experiment : Electronics