The GMC Terrain typically relies on a standard 12-volt lead‑acid battery for starting the engine and powering electrical systems. If your Terrain is equipped with the eAssist mild-hybrid system, there is an additional lithium‑ion high‑voltage battery pack that powers the hybrid components.
Standard GMC Terrain models: the 12-volt battery
The following points describe the battery setup for most non-hybrid Terrain trims. This helps buyers and owners understand what to expect under the hood.
- Battery type: 12-volt lead‑acid battery, with many newer GM models using a maintenance‑free design; some variants may use an AGM (absorbed glass mat) type.
- Location and role: mounted under the hood in the engine bay; powers starting, ignition, and standard electrical loads.
- Replacement guidance: typical lifespan is approximately 3–5 years under normal conditions; symptoms like slow cranking or dim headlights indicate testing is needed.
- Maintenance notes: keep terminals clean and tight; have the charging system tested if you suspect battery issues, especially in extreme climates.
In short, standard GMC Terrain models rely on a conventional 12‑volt battery to handle routine starting and electrical needs.
Terrain with eAssist: the hybrid battery
For Terrain models equipped with the eAssist mild-hybrid system, GM adds a high‑voltage battery to support electric-assisted propulsion, while a separate 12‑volt battery remains for normal vehicle functions.
- Battery type for hybrid: high‑voltage lithium‑ion battery pack used to power the electric motor and assist the gasoline engine during driving.
- Location and integration: the lithium‑ion pack is integrated with the hybrid system, typically located toward the rear of the vehicle or under the cargo area floor, depending on the model year.
- Auxiliary battery: a standard 12‑volt battery still exists to start the engine and run conventional electrical systems, kept charged via a DC‑DC converter from the high‑voltage system.
- Maintenance and service: high‑voltage hybrid components are not user‑serviceable; service requires GM‑certified technicians and proper safety procedures.
In short, eAssist Terrain models pair a conventional 12‑volt battery with a separate lithium‑ion high‑voltage pack that handles hybrid duties, with professional service recommended for high‑voltage components.
How to identify your GMC Terrain’s battery type
To confirm the exact battery configuration for your vehicle, use these quick checks. This helps you plan replacement or troubleshooting accurately.
- Check the battery label: look for chemistry indicators such as lead‑acid, AGM, or lithium‑ion on the under‑hood battery itself.
- Consult documentation: the owner's manual or window sticker may specify whether the model includes eAssist.
- Look for eAssist badges or high‑voltage indicators: presence of eAssist branding or a visible high‑voltage system label suggests a lithium‑ion pack.
Understanding the exact setup helps with correct replacement choices and safe handling during maintenance or service.
Summary
The GMC Terrain generally uses a traditional 12‑volt lead‑acid battery for standard models. If you have the eAssist hybrid, there is an additional lithium‑ion high‑voltage battery that powers the hybrid system, while the 12‑volt battery continues to handle starting and regular electronics. For precise specifications, check the owner’s manual or confirm with a GM dealer, as battery configurations can vary by model year and trim.
How much is a battery for a GMC Terrain?
between $363 and $392
The average cost for a GMC Terrain Battery Replacement is between $363 and $392. Labor costs are estimated between $61 and $90 while parts are typically priced around $302.
What battery goes in a 2020 GMC Terrain?
DieHard Platinum AGM – Battery : H6 Group Size, 760 CCA, 950 CA, 120 Minute Reserve Capacity (Part No. H6-AGM)
What kind of battery does a GMC Terrain take?
EverStart Maxx Lead Acid Automotive Battery, Group Size H5 / LN2 / 47 12 Volt, 650 CCA.
What kind of battery does GMC use?
ACDelco Batteries are the only batteries backed by GM.