Is Subaru battery AGM or standard?
In Subaru's modern lineup, the 12-volt battery is typically AGM (Absorbent Glass Mat), especially on models with EyeSight and other advanced electronics; older Subarus used conventional flooded lead-acid.
However, the exact type varies by model year and trim. To be sure, check the battery label, consult the owner's manual, or ask a Subaru dealer about the specific battery type for your vehicle.
How Subaru has approached battery types in recent years
Subaru has gradually shifted to AGM batteries in many new cars to support higher electrical loads and features such as EyeSight, Starlink, and idle-stop/start systems. Yet not every model or year uses AGM by default; some base trims still rely on traditional flooded lead-acid batteries.
Use the following indicators to identify whether a specific Subaru uses an AGM or standard lead-acid battery in your vehicle.
- Battery label or stamping: Look for "AGM" or "Absorbent Glass Mat" on the case or on a label. AGM packs are typically clearly marked.
- Vehicle features that increase electrical load: Models with EyeSight, Starlink/infotainment, heated seats, and idle-stop/start are more likely to use an AGM battery due to higher charging demands.
- Official documentation: The owner's manual or Subaru service literature for your exact model/year will specify the battery type (for example, "12V AGM battery").
- VIN/service data: If in doubt, your dealer can confirm by checking the vehicle's VIN against the factory electrical specification.
If none of these indicators are definitive, rely on the owner's manual or contact a Subaru dealership to confirm the battery type before replacement, since AGM and standard batteries require different charging and maintenance practices.
Maintenance and replacement considerations
Understanding whether your Subaru uses an AGM or conventional battery matters when charging, jump-starting, and replacing it. AGM batteries are sealed and maintenance-free, but they have different charging voltages and can be damaged by deep discharges if not treated properly. Conventional flooded batteries are more tolerant of deep discharge but require periodic water top-ups and can be more susceptible to vibration-related wear in some configurations.
Key considerations for care and replacement include the following:
- Maintenance: AGM batteries are sealed; you typically do not add water. Conventional batteries may require periodic water top-ups and terminal care.
- Charging: AGM batteries usually prefer a charger set to higher voltages around 14.4–14.7 volts for bulk charging; avoid excessive voltage. Conventional batteries can tolerate a similar range but follow manufacturer recommendations.
- Replacement interval: Expect roughly 3–5 years for AGM batteries in modern Subarus in typical climates; conventional batteries often last 3–4 years depending on use and environment.
- Protection and storage: If storing the car, use a trickle charger suitable for AGM or a recommended battery maintainer to prevent sulfation.
- Jump-starting and charging safety: Follow proper jump-start procedures and use a compatible charger or jumper cables; never reverse polarity or remove safety components during maintenance.
In short, knowing whether your Subaru uses an AGM or standard battery helps with maintenance, charging practices, and replacement planning, ensuring optimal performance of electrical systems and safety features.
Summary
Subaru’s newer vehicles commonly use AGM 12-volt batteries to support electrical systems and driver-assist technologies, but some older or base trims may still use conventional lead-acid batteries. Verify the exact type for your model/year by checking the battery label, consulting the owner’s manual, or asking a dealer. Following the correct battery type guidance helps with longevity and reliable operation of your Subaru’s electrical system.
