The 2015 Subaru WRX uses a 12-volt automotive battery. In most cases this is a sealed, maintenance-free lead-acid unit, with the exact type (flooded vs AGM) varying by market, equipment, and production date. Always verify by checking the battery label or the owner's manual.
Battery basics for the 2015 WRX
The 12-volt battery powers the car’s starting system and all electronics when the engine is off or not running. It sits in the engine bay and is separate from the engine's high-voltage components. Replacing it is a routine maintenance task, and selecting a replacement that matches the car’s electrical needs is important for reliability.
Is it AGM or standard?
Many 2015 WRX units use a sealed lead-acid battery, often described as maintenance-free. Some markets or optional equipment may use an absorbed glass mat (AGM) battery, which handles higher electrical demands and repeated discharging better. To be sure, check the battery label or your vehicle’s manual.
To help you verify the exact spec and ensure you get the right replacement, consider the following steps.
- Check the battery label for the type designation: AGM or standard flooded lead-acid.
- Look for the required group size and cold-cranking amps (CCA) in the owner's manual or on Subaru's parts catalog for your model year and market.
- If your WRX has start-stop or heavy electrical options, the original battery is more likely AGM; confirm with the dealer.
- When replacing, choose a battery with equal or higher CCA and capacity to meet climate and usage conditions.
In practice, the most important is to match the 12-volt battery to the car’s electrical load and the climate in which you drive; using the recommended spec ensures reliable starts and electronics performance.
What to do if you’re unsure
If you’re uncertain about the exact battery specification for your 2015 WRX, consult your owner’s manual, contact a Subaru dealer, or bring the car to a trusted technician. They can verify the correct group size, type, and CCA by checking the existing battery label or VIN-specific parts catalog.
Summary
The 2015 Subaru WRX uses a 12-volt battery, typically a sealed lead-acid unit. The exact type—standard flooded or AGM—can vary by market and equipment. Verify the spec on the battery label or in the owner’s manual, and replace with a battery that matches the car’s electrical needs and climate.