I can't find a better post quickly, but this one shows the items that are 12 mo/12,000 miles and the battery wasn't listed so it should be 36 mo/36,000 miles. This was for the 2017 Pacifica.
"Per page 6 of a 2017 Pacifica's warranty manual:
"F. When It Ends
The Basic Limited Warranty lasts for 36 months from the date it begins or for 36,000 miles on the odometer, whichever occurs first. But the following items are covered only for 12 months or for 12,000 miles on the odometer, whichever occurs first:
• brakes (rotors, pads, linings, and drums);
• wiper blades;
• clutch discs or modular clutch assembly (as equipped);
• windshield and rear window; and
• wheel alignment and wheel balancing"
Chrysler Social Care Specialist
Check your warranty booklet, battery, or ask the dealer.
You can get warranty info for a 2018 gas Pacifica at the following website, but it looks similar to the 2017.