u/X-Punk3000

I have a 2018 Jeep Compass.

I was driving home I got the service engine light and got the warning message to pull over to a safe place because the car will stop. I've gotten those before and always continued driving and the car always started back up without the warning message after I turned it off. Also on the way home for a second it said battery saver on and some features may not be available.

So I got home and parked safely. But this time the car didn't start when I tried. I even tried walking far away with the keys and coming back and trying again, no luck. The main battery I recently changed at walmart. So it can't be that. The auxiliary battery I haven't changed recently (I think 3 years).

So my question is does this appear to be the auxiliary battery or could it be something more sinister?

I have a 2018 Jeep Compass. I drove my car like normal, parked, went inside a store.

Came back to the car and it wouldn't start. I tried a few times nothing. By pure luck there was an advanced auto within walking distance. I went there and they said they can't even change the battery unless it's in front of the store.

So I went back to the car, found a random guy that would help me push it for some cash. I went back to my car and lo and behold it started.

The battery was changed in January 2023, so 3 years and 4 months. I would guess it's time to change the battery regardless. But why did the car not start all of a sudden despite multiple attempts then after 10-20 minutes start again like nothing happened?

Could this be just the battery? Or something more sinister?