M5.Lcd.setCursor(startX, currentY);
float vinVoltage = M5.Axp.GetVinVoltage();
bool hasUsbPower = (vinVoltage > 4.5);
bool hasBackPower = M5.Axp.isCharging(); // Check if charging via any source
M5.Lcd.setTextColor(WHITE);
M5.Lcd.print(F("USB-C: "));
M5.Lcd.setTextColor(hasUsbPower ? PAL_GREEN : RED);
M5.Lcd.printf("%.1fV", vinVoltage);
currentY += lineSpacing;

M5.Lcd.setCursor(startX, currentY);
M5.Lcd.setTextColor(WHITE);
M5.Lcd.print(F("Back: "));
M5.Lcd.setTextColor(hasBackPower ? PAL_GREEN : RED);
if (hasBackPower && !hasUsbPower) { // Only show back power if it's the source
    M5.Lcd.printf("%.1fV", M5.Axp.GetVBusVoltage());
} else {
    M5.Lcd.print(" --");
}
currentY += lineSpacing;

// Check battery level
M5.Lcd.setCursor(startX, currentY);
float batteryLevel = M5.Axp.GetBatteryLevel();
M5.Lcd.setTextColor(WHITE);
M5.Lcd.print(F("Battery: "));
M5.Lcd.setTextColor(batteryLevel > 20 ? PAL_GREEN : RED);
M5.Lcd.printf("%d%%", (int)batteryLevel);
currentY += lineSpacing;