I’m no exprert, but I think it’s a “vintage Mopar vs. modern Mopar thing.”
Vintage Mopar, I suspect can do well without a tender while in winter storage.
Modern Mopars have a continual micro battery drain due to all the advanced micro circuits and such.
A good tender on such will keep it topped off, so to speak.
It’s the “up / down” storage charge factors that are very hard on their batteries.
My 2020 Challenger Scat Pack is stored in a drywall insulated garage, which is house attached.
It’s on a Deltran 1.25 amp tender for the winter.
Battery Tender Plus 12V Battery Charger and Maintainer: 1.25 AMP Powersport Battery Charger and Maintainer for Motorcycles, ATVs, UTVs - Smart 12 Volt Automatic Float Charger - 021-0128
https://a.co/d/ec44JJn