OPEN SAMRT Battery Style Digital Tube LED Battery Level Display Module 4 color 10 segment LED Bar for Arduino|bar led|bar barbar led display - AliExpress
Battery Style Digital Tube Led Battery Level Display Module Green Inside And Red Outside For Arduino - Industrial Computer & Accessories - AliExpress
Arduino battery control charge and discharge Battery Level Indicator - YouTube
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 indicator using an OLED display | Artekit Labs Tutorials