ESS, dead Battery, and etc.
Chrysler will mess around with you as they have done with numerous other customers. The easy, albeit a bit expensive, solution is to have a high grade ESS and main battery installed by a qualified independent technician.
Chrysler will probably decide that both batteries are bad and replace them with identical OEM replacements. This guarantees that you will have the same problem again. A set of good batteries should get you 24-36 months of no battery issues.
It is important to get the battery issue sorted out because there is very little tolerance in the Pacifica for any battery weakness.
When you get the new batteries installed, I suggest that you pay the technician to ensure that all connections to/from the batteries, alternator, voltage regulator, and etc. are clean and tight. YMMV
2018 Touring L+
March 2018 Build