Auxiliary Battery location ?

See the main battery? The stop start battery is in the plastic box behind it buried under fuses . It is NOT a standard sized battery about the size of a Harley battery. Had to dig for the info hope that helps.

I have a 2019 Trailhawk too. I disconnected the cables on the topside of the fusebox and lifted it about an inch or so. You need to reach under the fuse box and unplug a large cable and I was afraid I wouldn't get it plugged back in so I left it alone. From what I could barely see under the fusebox, I didn't see a aux battery. Maybe it's still under there but I have to get the fusebox totally out to see it?

That is stupid to have to search for where this is... Been trying to find the answer for hours, so, thank you.... Also, what an idiot move on placement... Stelantis has its head up its arse!