I have a 2010 Journey. My battery had to be changed (btw is it normal for battery to last < 5years and esp since I've done much less driving due to Covid?). Got a new one installed but I didn't know that would cause a smog check to fail.
What do I need to do and how long to wait before I test again? Car has no other issues, I've read its 100 miles driving or some specific procedures to reset the codes?

I have a cheap bluetooth ODB scanner I never really used, can I use that to check the codes etc? If so please tell me specific methods/apps to use.

 

Here, when you fail a smog check, they give you the ODBII codes. If you have a scanner, you should be able to read the codes. If you can't figure out your bluetooth one, you can borrow one from AutoZone, and possibly from other parts shops. Knowing the particular codes being thrown will help you narrow down your causes. I'm 99% sure your new battery isn't the cause.

 

I can’t understand for the life of me how battery replacement would cause you to fail smog. I think this as a coincidence