What group size battery for Subaru Outback?
For most Subaru Outback models, the standard replacement battery is Group Size 35. However, the exact size can vary by model year and engine, so it’s important to verify the correct group size before purchasing a new battery.
Common group sizes you may encounter
Subaru Outbacks span many generations, and while Group Size 35 is by far the most common in recent years, some older or specialized trims use different sizes. The list below highlights the sizes you’re most likely to encounter during a typical ownership period.
- Group Size 35
- Group Size 24F
- Group Size 25
In practice, Group 35 remains the predominant choice for the modern Outback, with 24F and 25 appearing mainly in older generations or unique configurations.
How to verify the exact group size for your Outback
To ensure you buy the correct battery, use a method that cross-checks the OEM specification for your exact year and trim.
- Check the existing battery label for the BCI group size code (for example, “Group 35”).
- Consult your owner’s manual or Subaru’s official parts diagrams for your model year.
- Enter your vehicle’s VIN on Subaru’s official parts website or contact a dealership to confirm the correct group size.
- Compare battery dimensions and terminal layout to the existing battery to ensure a proper fit in the tray and connection points.
Verifying through official sources and the battery’s physical dimensions helps prevent fitment issues and ensures you meet the vehicle’s electrical demands.
Additional considerations for Outback battery replacements
Beyond group size, consider battery type, cold-cranking amps (CCA), and the vehicle’s electrical needs. Most Outbacks use a standard flooded lead-acid battery, but some newer or higher-demand configurations may benefit from an AGM battery, especially in very cold climates or if the car has additional electrical accessories. Always match or exceed the OEM’s CCA rating and ensure the replacement fits the battery tray and terminal orientation.
- AGM vs. flooded: AGM batteries offer better resistance to vibration and longer life in harsh conditions but cost more.
- CCA requirements: choose a battery with equal or higher CCA than the OEM specification for reliable starts in cold weather.
- Warranty and brand reliability: look for a warranty range appropriate to your climate and driving patterns.
Summary
The typical battery group size for a modern Subaru Outback is Group Size 35, but exact sizing varies by year and engine. Always verify with the battery label, owner’s manual, or a Subaru dealer using your VIN to ensure an exact match. When replacing, consider CCA needs and whether an AGM option is appropriate for your climate and configuration.
