Ugh, frustrating. In regards to the OEM batteries, I think it's coming to a consensus that they suck, or at least the way they're being charged sucks. And who knows what batteries they replaced yours with, did they come off another van that's been sitting in their lot for 6 months? Worse yet, did they say they changed them but didn't?
Me personally I'd replace them asap with good quality aftermarket batteries. If after many weeks ESS works fine then send Chrysler the bill. If it fails, then i'd still send them the bill.
2019 Hybrid Limited Black with bird poop accents, S Package, Froot Loops, Advanced Safetytec, NO SUNROOF
☞ manufactured Weds 11/07/18 at 6PM, it was overcast