I have built a battery level indicator and have tested with a 12V battery Would it harm my arduino board if I connect a 48V battery? - Arduino Stack Exchange
Battery Level Indicator | Tinkercad
Battery indicator using an OLED display | Artekit Labs Tutorials
IoT Lithium Battery Monitoring system using ESP8266 & Arduino IoT Cloud
Battery indicator using an OLED display | Artekit Labs Tutorials
Battery Voltage Indicator using Arduino and LED Bar Graph