Hi.
I’m sorry, but I’m not familiar with this subject.
Regards,
Sara

Prompted Google’s Bard; this is the response for using a INA219 sensor:

Sure, here is an example of integrating the current over time to calculate the battery capacity:

C++

#include <Wire.h>
#include <INA219.h>

INA219 ina219(0x40);

long totalCharge = 0; // Variable to store the total charge consumed
long startTime = 0; // Variable to store the start time

void setup() {
  Serial.begin(115200);
  Wire.begin();
  ina219.begin();

  startTime = millis(); // Record the start time
}

void loop() {
  long current = ina219.getCurrent_mA(); // Read the current in mA
  long elapsedTime = millis() - startTime; // Calculate the elapsed time in milliseconds

  totalCharge += current * elapsedTime; // Update the total charge consumed
  startTime = millis(); // Reset the start time for the next iteration

  Serial.print("Total Charge: ");
  Serial.println(totalCharge);

  delay(1000); // Delay for 1 second
}

This code will print the total charge consumed by the battery to the serial monitor every second. You can modify this code to calculate the remaining battery capacity by dividing the total charge by the battery’s nominal capacity (in mAh).

Will investigate and experiment further.

Regards,
William