In most Subarus sold in North America, the standard 12-volt battery is a Group 35 size, but there are important exceptions. Always verify the exact size for your specific model year and trim using your owner's manual, the battery label, or the dealership’s parts database.
Understanding battery group sizes
Battery group sizes are standardized dimensions that ensure the battery fits the vehicle’s tray and terminal layout. Group 35 is a common mid-size automotive battery, but not every Subaru uses it in every year or trim. Some Subarus may use Group 24F or other sizes, especially in configurations with start-stop systems or different engine options.
Common Group 35 usage in Subaru models
The following Subaru models and trims are frequently equipped with a Group 35 battery in recent years. Note that variations by year and optional equipment can occur.
- Outback
- Legacy
- Forester
- Impreza
- Crosstrek
- WRX
The above list reflects models that commonly use Group 35 batteries, but always confirm for your specific vehicle. Some higher-end or stop-start-equipped versions may require a different size or an AGM-type battery.
How to verify the correct battery size for your Subaru
Before purchasing a replacement, use these steps to confirm the exact Group size for your car.
- Check the owner's manual under the specifications or electrical system section for the recommended battery group size.
- Inspect the current battery: many Group 35 batteries have “Group 35” printed on the top or case label. Look for a label or embossed mark.
- Look in the engine bay for a sticker or stamp near the battery tray that lists the group size or part number.
- If you have access to the vehicle’s VIN, use Subaru’s official parts site or a dealership Parts Department to look up the exact battery size and type for that VIN.
- Check the dimensions and terminal layout to ensure the replacement will physically fit and align with the cables.
Verifying using multiple sources helps avoid buying the wrong size, especially if your car has optional equipment or a recent update.
What to consider when replacing your Subaru battery
Beyond confirming the Group size, consider these factors to ensure reliable performance and compatibility with your vehicle’s systems.
- Group size compatibility: ensure the replacement is Group 35 (or the exact size your vehicle requires) to fit the tray and post locations.
- Cold-cranking amps (CCA): choose a battery with equal or higher CCA than the OEM specification to ensure reliable starts in cold weather.
- Reserve capacity (RC): higher RC can help electronics function during longer periods of idle or if alternator performance is limited.
- AGM vs flooded: many newer Subarus, especially those with stop-start systems, require or perform better with AGM (absorbed glass mat) batteries. If your car has start-stop, an AGM type is often recommended or required.
- Warranty and brand: consider a reputable brand with a solid warranty; some dealers offer OEM-replacement batteries with guaranteed fitment.
- Installation considerations: ensure proper torque on terminals, clean connections, and correct orientation to avoid drainage or misfiring warnings.
When in doubt, have a professional technician confirm the exact battery size and type for your particular Subaru model and year.
Summary
Most Subaru models sold in recent years use a Group 35 12-volt battery, but it is not universal. Always verify with the manual, battery label, or dealership lookup for your specific VIN. Proper replacement—considering group size, CCA, RC, and whether an AGM is required—helps ensure reliable starts and uninterrupted electronics across seasons.