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 Voltage Indicator using Arduino and LED Bar Graph
Battery Level Indicator Circuit using LM3914
Build A Homemade Battery Charge Meter With Arduino
Battery Display Red and Green Battery Style Digital Tube LED Battery Level Display Module for Arduino|module for arduino|module ledmodule battery - AliExpress
LED Bar Green Strip 10 Segment Strip Digital Tube Light Emitting Module Battery Level Display Module For Arduino|module for arduino|module ledmodule light - AliExpress
Wiki Project: Music Reactive LED Strip | by Daman Mulye | Medium
Battery Voltage Indicator using Arduino and LED Bar Graph | Arduino, Bar graphs, Arduino projects