Are you still checking your battery's voltage by running OBC TEST 9 just before starting the car? If so, this 15 second test will give you a heads up if your battery is going to have enough juice to start the car.
If Test 9 is showing below 11.89 volts (ignition in position 1 or 2 just before starting the car)...your battery is at or below 0% state of charge...which means that it will be calling on its reserve capacity & cold cranking amps to get the car started.
If the battery is old and deeply discharged...you will usually hear a familiar "click, click, click" from the starter as it sputters to try to bring the car to life...but that "click, click, click" sound is a sure bet that the attempt is going to fail.
