https://www.instructables.com/Battery-Level-Indicator-1/
Battery Level Indicator : 4 Steps (with Pictures) - Instructables
Battery Level Indicator: If, like me, you have a camera, you certainely also have some batteries, the issue is, you never know if a battery is full or empty !...
battery level indicator4stepspicturesinstructables
https://www.instructables.com/How-to-Make-Battery-Charge-Level-Indicator/
How to Make Battery Charge Level Indicator : 5 Steps - Instructables
How to Make Battery Charge Level Indicator: In this project, I will show you how to make a battery charge level indicator with some 5mm leds and 1k resistors.
how to makelevel indicator5 stepsbatterycharge