The Car Battery Test app gives you information about the condition of your battery by reading the voltage information of your car.
In order to use the application, you must have ELM327 with bluetooth connection. Connect the ELM327 to the OBD2 port of your vehicle and pair your phone with the ELM327. The pairing password will usually be "1234" or "0000". Open the application and click the bluetooth icon at the top right. Select the ELM327 device that you have paired from the pop-up screen. You can see your battery status by following the instructions on the screen. You can get better results if you use the app after using your vehicle for a long time.

Note: The application is designed to give you an idea of ​​your battery. It does not give exact results. The given result may also vary depending on the condition of your vehicle.