Temp and Humidity Monitor with Graphs and Battery Monitor - Hackster.io
Monitoring a LiPo battery while powering the Arduino UNO with it - Project Guidance - Arduino Forum
12V battery meter with Arduino MEGA - Sensors - Arduino Forum
4S Battery voltmeter for individual cells(schematic help please) - Project Guidance - Arduino Forum
12v Solar battery monitor | MySensors Forum
Battery Voltage Indicator using Arduino Nano - Project Guidance - Arduino Forum
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