What type of battery does a 4Runner use?
The 4Runner relies on a standard 12-volt automotive battery for starting and electrical systems; it does not use the high-voltage traction battery found in Toyota’s hybrid models. This article explains the typical battery type, common sizes, and how to identify or replace it across model years.
Battery basics for the 4Runner
Most 4Runners use a conventional 12-volt lead-acid battery that is sealed and maintenance-free. Depending on the model year and market, some trims may use an Absorbent Glass Mat (AGM) variant, which is still a 12-volt system but offers better vibration resistance and durability for rugged use.
What this means in practice
In everyday terms, you’ll be dealing with a standard automotive battery, not a high-voltage pack. Replacement parts are readily available, and you’ll want a battery with the correct group size and sufficient cold-cranking amps (CCA) for reliable starts in your climate.
- Most recent North American 4Runners use a 12-volt maintenance-free (sealed) lead-acid battery.
- AGM is a possibility on some years or markets; it is still a 12-volt battery but with a different internal construction.
- Group sizes commonly used include 24F or 35, though exact sizing varies by year and configuration—check the label or owner’s manual.
When replacing, aim for the same specifications (12V, appropriate CCA, and the correct group size) to ensure proper fit and reliable starting performance in all seasons.
Identifying and replacing your 4Runner battery
To confirm the exact battery specs, inspect the label on the top of the battery or consult the owner’s manual. You’ll typically see the battery type (flooded or AGM), the group size, CCA, and RC (reserve capacity).
Tips on choosing the right replacement
Match the 12-volt designation, group size, and CCA to what your vehicle requires. If you’re unsure, a reputable auto parts store or Toyota dealership can cross-check your VIN and suggest a correct replacement.
- Group size: look for a label indicating 24F, 35, or another size compatible with your vehicle.
- CCA (cold-cranking amps): ensure it meets or exceeds the OEM specification for reliable starts in your climate.
- AGM vs flooded: confirm whether your vehicle requires or benefits from AGM construction.
Choosing the right battery prevents starting issues and ensures consistent performance in extreme temperatures or frequent use of electrical accessories.
Care and maintenance tips
Proper care can extend the life of your 12-volt battery and reduce the risk of unexpected failures.
- Keep terminals clean and tight; apply a dielectric or terminal protectant to prevent corrosion.
- Regularly test battery health, especially before winter or extended trips; a resting voltage around 12.6V is ideal, and a load test can reveal deeper issues.
- Check for parasitic drains when the vehicle is off, and ensure the alternator is charging correctly.
- Avoid letting the battery sit for long periods discharged; if the vehicle will be inactive, use a battery maintainer if possible.
With proper maintenance, a 12-volt battery in a 4Runner typically lasts several years, though climate, driving habits, and accessory load can influence longevity.
Summary: The Toyota 4Runner relies on a 12-volt automotive lead-acid battery—most commonly maintenance-free, with potential AGM variants depending on year or market. Always verify the group size (such as 24F or 35) and CCA on the label or in the owner's manual when replacing, and perform regular maintenance to maximize life and reliability.
