I have an existing circuit powered with a 3.7V LiPo battery. To indicate when the battery is under 3V, I wanted to add an LED which shows me to charge the battery.
The circuit has to be very small.
I searched for circuits on the internet but they mostly had rather complicated circuits and not suited for my system. I need it to show me only when the battery is under 3V. It doesn't need to be adjustable. What would the circuit look like? I saw many circuits with ICs and transistors. I didn't get how to choose the right components for my task.