The gas-powered 2018 Pacifica uses a standard 12-volt lead‑acid battery (typically Group Size 75) with about 700–800 cold-cranking amps, while the Pacifica Hybrid relies on a high‑voltage traction battery for propulsion and a separate 12‑volt battery for accessories.
The 2018 Pacifica lineup includes both a gasoline variant and a plug‑in hybrid. This article breaks down the right battery choices for the gas model and explains how the hybrid’s high‑voltage system differs, along with guidance on verifying size, replacing the 12‑volt battery, and safety considerations for the hybrid system.
Gasoline Pacifica (non-hybrid) — 12-volt battery
The 12‑volt battery in the gas model handles starting and powering electronics when the engine is off. Most 2018 Pacifica gas vehicles use a standard 12‑volt lead‑acid battery; some trims may use an absorbed glass mat (AGM) battery to support higher electrical demand.
Before listing common replacement specs, note that exact group size and CCA can vary by trim, production year, and battery supplier. Always verify with your VIN.
- Group size: typically 75 (often listed as 75 or 75D in catalogs)
- Voltage: 12 volts
- Battery type: conventional lead‑acid, with AGM as an option on some configurations
- Cold-cranking amps (CCA): roughly 700–800 A
- Reserve capacity (RC): commonly 90–120 minutes
- Terminal layout: confirm positive/negative terminals on the battery label to match your car’s harnesses
When replacing, pick a battery that matches the group size, voltage, and CCA/RC requirements. If you use the vehicle in very cold climates or with heavy electrical loads, an AGM battery can offer longer life and steadier performance.
Chrysler Pacifica Hybrid (PHEV) — battery considerations
The 2018 Pacifica Hybrid uses two distinct battery systems: a high‑voltage lithium‑ion traction pack for propulsion and a separate 12‑volt auxiliary battery for standard vehicle systems. The high‑voltage pack is not a consumer‑replaceable item; service is performed by trained technicians at a dealership or qualified shop.
Before listing, note that the traction battery’s capacity is commonly cited around 16 kWh, with a high‑voltage system managed by the hybrid drivetrain. Exact specs can vary slightly by production batch.
- Traction battery: high‑voltage lithium‑ion pack used for propulsion (not a typical DIY replacement)
- 12‑volt auxiliary battery: powers standard electronics and accessories, replaced similarly to the gas model
- Safety: high‑voltage systems require specialized training; never attempt to service or disconnect HV components unless properly trained
For battery service on the Hybrid, rely on a dealer or a certified hybrid technician. The 12‑volt battery can be replaced in the same general way as the gas model, but the vehicle’s HV system calls for caution and professional handling.
How to identify the correct replacement battery for your Pacifica
Accurate replacement starts with confirming group size, voltage, and CCA/RC ratings, as well as whether you own the gas or hybrid model. Use your VIN, consult the owner's manual, inspect the battery label in the engine bay, or ask a parts professional to ensure an exact match.
Steps to verify and replace
- Check the owner's manual or the battery label for group size and CCA rating
- Compare to a reputable replacement that matches the group size and rating
- If uncertain, visit a mechanic or dealership to confirm compatibility with your VIN
When replacing the 12‑volt battery, follow standard safety procedures: disconnect the negative terminal first, then the positive, remove the old battery, clean terminals, install the new battery, and reconnect the negative terminal first. If you drive a Pacifica Hybrid, avoid interacting with the high‑voltage system unless you are trained and authorized.
Where to buy and warranty considerations
You can purchase 12‑volt replacement batteries from automotive retailers, OEM‑grade or aftermarket brands (such as DieHard, Bosch, Interstate, or Mopar/OEM equivalents). Look for a warranty of at least 24–36 months and consider pro‑rating for capacity loss over time. For the hybrid, rely on dealer service for high‑voltage battery work and use the manufacturer’s recommended service intervals.
Summary: For the 2018 Chrysler Pacifica, the gas model uses a 12‑volt lead‑acid battery (group size around 75) with about 700–800 CCA, while the Pacifica Hybrid uses a high‑voltage traction battery for propulsion plus a separate 12‑volt battery for accessories; HV work should be handled by qualified technicians. Always verify exact group size, CCA, and compatibility with your VIN before purchasing a replacement.