How can I read an I2C Sensor as well as the batterycharge?

Hi there,
I have the Heltec ESP32 LoRa32 V2.
I managed to get Batterycharge Readings from Pin 37.
How can I also read my SGP30 CO2 Sensor via I2C?

I tried it with the I2C Pins for the OLED (SDA: 4, SCL: 15) but this didn’t work for me, or did I do something wrong?
I tried it with this I2C Scanner:

Hope you can help me!


please refer the pictures: