I, too, have had issues with my Auxiliary battery on my 2018 Chrysler Pacifica. We didn't like the stop/start feature, and honestly, rarely are in a city where it would need to function, anyway (90% hwy driving). When seeking help from our dealer, he explained that since was turned it off all the time, the battery never got the opportunity to re-charge and so it died. They wanted $290 for the battery plus labor for exchanging it out, and my extended warranty didn't cover batteries. So we went home, and replaced it for $151. After the new battery was in place, the warning light did not go out. So I drove the 45 miles back to my dealer, asked them if they could turn it off. They said the battery would have to "learn" to charge itself, and would start working again soon. When it did so, the light would go out on its own. 200 miles later, light still on, and I am afraid I've wasted the money on my new auxiliary battery. Can anyone tell me if their warning light stayed on after the new battery was installed and if it did INDEED learn to recharge itself??