My car wont start most of the time after pushing the start button but has new batteries in smart key and everything functioning
The key that you are using could very well be defective. I would try a second key and see if that is still having intermittent start issues.
Also I would double check the batteries that you installed. Test them with a voltmeter. Do you know what the expiration date was on those batteries. You may be surprised to find out that they are discharged. It can happened.