A 12-volt automotive battery is required for a 2017 Subaru Forester, with Group Size 35 being the most common replacement. Always verify the exact specification from your owner's manual or the current battery label, as variations can exist by market or trim.
Battery size and type
Below is a snapshot of the specs you’ll typically see for a replacement battery for the 2017 Forester. Use this as a guide and verify against your vehicle’s manual or the current battery label.
- Group size: 35 (often labeled as 35 or 35R depending on terminal arrangement)
- Voltage: 12V
- Battery type: Flooded lead-acid (standard maintenance-free designs are common); some owners opt for AGM in certain conditions
- Typical cold-cranking amps (CCA): approximately 550–650 CCA for standard climates; higher CCA options (up to around 700 CCA) are available for colder regions
When shopping, look for a Group Size 35 label and a 12V rating, and choose a CCA that matches your climate needs. Also ensure the battery fits the Forester’s tray and hold-down hardware.
How to confirm the exact specification for your vehicle
To avoid buying the wrong battery, confirm using these steps and checks.
- Consult the owner’s manual or Subaru’s official parts catalog for the recommended Group Size and CCA for your exact model year
- Inspect the current battery label on the top or side for the Group Size (e.g., 35 or 35R), CCA, and reserve capacity (RC)
- Use your VIN with a reputable parts retailer or dealership to verify compatibility
Using the VIN-based lookup and matching the battery label are the most reliable ways to ensure you get the correct replacement for your Forester.
OEM vs aftermarket and AGM considerations
Which option fits your needs
Most 2017 Foresters use a standard, flooded 12V battery as the OEM replacement. Some owners opt for maintenance-free sealed batteries or an AGM (Absorbent Glass Mat) battery for greater vibration resistance, improved cold-start performance, or longer life in demanding conditions. AGM batteries tend to be more expensive and may require compatible charging systems and slightly different installation considerations.
- Flooded lead-acid (typical OEM replacement): lower cost, widely available
- Maintenance-free sealed lead-acid: common alternative with similar performance in many climates
- AGM (absorbent glass mat): higher performance and resilience, but higher price and potential charging considerations
Choose based on climate, budget, and how you use the vehicle. If in doubt, consult a Subaru dealer or a trusted auto parts professional who can confirm compatibility with your specific Forester configuration.
Summary
For most 2017 Subaru Forester models, the standard replacement battery is a 12-volt battery in Group Size 35. Verify the exact specification via the owner’s manual or the existing battery label, and consider climate and electrical load when choosing between flooded, maintenance-free, or AGM options. Always ensure the battery physically fits and matches the vehicle’s tray and terminal configuration. A correct match helps ensure reliable starts and electrical performance for years to come.