Interesting project! Thank you, and thank you for your input. I would use a voltage divider then into ADC. The battery voltage of 12V is nominal and there will be some kind of discharge curve. The ADC will give you detailed information. I just started with electronics so sorry if its silly question...

So I got idea for little project but not sure about lot of details. What I was thinking is replacing my motorcycle battery with DIY LiFePO4 but adding esp32 inside as well. ESP32 should monitors the state of the motorcycle battery and any movement from accelerometer (for security reasons, it's semi-...