The Best Subaru Car Battery

Your Subaru is built for adventure, but a dying battery can leave you stranded. Choosing the right replacement means balancing cold cranking amps (CCA) for those chilly mornings, reserve capacity for accessories, and the correct group size for your model.

We’ve combed through expert reviews, verified buyer feedback, and technical specs to identify the best Subaru car battery for every driver. Here are our top picks.

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Best Subaru Car Battery Buying Guide

Group Size Compatibility

Subaru models commonly use Group 35 or Group 47 batteries, but some older or Outback models may require Group 25 or 48. Always check your owner’s manual or the existing battery label.

Using the wrong group size can lead to poor fitment or terminal misalignment. For a detailed breakdown of fitment across models, see our replacement car battery guide.

Group 35 batteries (roughly 9 x 6.9 x 8.8 inches) are common in Forester, Impreza, and Legacy. Group 47 (9.5 x 6.9 x 7.5 inches) fits many Crosstrek and newer Outback models. If you’re unsure, measuring your current battery’s dimensions is a reliable backup.

Cold Cranking Amps (CCA) and Reserve Capacity

CCA measures starting power in cold weather. For most Subarus, 550, 650 CCA is sufficient, but if you live in a region with harsh winters, aim for 700+ CCA.

Reserve capacity (RC) indicates how long the battery can run electronics if the alternator fails. A higher RC (100 minutes or more) is ideal for camping or long accessory use. Our winter car battery picks emphasize high CCA models.

Optima RedTop batteries offer excellent CCA for their size, while Weize Platinum provides strong RC at a lower price. For extreme cold, consider a battery with at least 680 CCA.

Battery Type: AGM vs Flooded

Absorbent Glass Mat (AGM) batteries are spill-proof, vibration-resistant, and handle deep discharges better than flooded lead-acid. Most modern Subarus with start-stop systems require AGM. Flooded batteries are cheaper but need periodic water checks and are more prone to sulfation.

For a closer look at AGM technology, check out our AGM car battery guide.

All our top picks are AGM, except some older Optima RedTop models (which are also AGM). If your Subaru doesn’t have start-stop, a quality flooded battery can still work, but AGM offers longer life and better performance.

Warranty and Brand Reputation

A longer warranty often signals higher confidence in durability. Optima and ACDelco offer 36-month free replacement, while Weize provides 36 months as well. Mighty Max offers 36 months on its AGM models.

Brands with strong reputations for quality control reduce the risk of premature failure. Our warranty car battery roundup highlights the best coverage options.

Reading verified buyer feedback on long-term performance is also valuable. Many Subaru owners report 4, 5 years of reliable service from Optima and ACDelco batteries.

Start-Stop Compatibility

If your Subaru has a start-stop system (common in 2020+ models), you need a battery designed for frequent cycling. AGM batteries with high cyclic durability are essential. The Mighty Max MM-G35 and MM-H5 are specifically marketed for start-stop applications.

For more options, see our AGM starting battery picks.

Using a standard flooded battery in a start-stop vehicle can lead to premature failure and may void the warranty. Stick with AGM for peace of mind.

Why You Should Trust Us

At BestProducts, we evaluate each product using a consistent methodology and assign a BP Score on a 0-to-10 scale.

Our assessments are based on a synthesis of technical specifications, expert review consensus, verified buyer feedback, and published data with cited sources.

We do not conduct our own product trials; our evaluations are grounded in research, published data, expert review consensus, and verified buyer feedback. Our team of automotive editors has years of experience analyzing car batteries and accessories.

We prioritize transparency and accuracy to help you make an informed purchase.

We also consider factors like warranty length, brand reputation, and real-world performance reported by Subaru owners. Every product in this roundup has earned a BP Score of 7.8 or higher, reflecting strong consensus across multiple data points.

Final Thoughts

After thorough analysis, these are our award picks for the best Subaru car battery:

• Best Overall: OPTIMA RedTop 35, The highest BP Score in our lineup, offering exceptional CCA and durability for most Subaru models.
• Best Value: Weize Platinum AGM Group 47, Combines strong performance with a budget-friendly price, ideal for Crosstrek and Outback owners.
• Best for Cold Weather: OPTIMA RedTop 25, High CCA and proven reliability in freezing temperatures, perfect for northern climates.
• Best for Start-Stop Systems: Mighty Max MM-G35, Designed for frequent cycling, with a 8.0 BP Score and excellent value.

Frequently Asked Questions

What group size battery does my Subaru need?

Most Subaru models use Group 35 (Forester, Impreza, Legacy) or Group 47 (Crosstrek, Outback). Group 25 and Group 48 are less common but may appear in older or special models. Always check your owner’s manual or the battery label.

Our SUV battery guide covers larger batteries for Outback and Ascent.

Can I use a flooded battery in my Subaru?

Yes, if your Subaru does not have a start-stop system and you live in a moderate climate. However, AGM batteries offer longer life, better vibration resistance, and maintenance-free operation. For most drivers, AGM is worth the extra cost.

Check our sealed car battery recommendations for more options.

How long should a Subaru battery last?

Typically 3, 5 years, depending on climate, driving habits, and battery quality. AGM batteries often last longer than flooded ones. Extreme heat or cold can shorten lifespan. Our longevity car battery picks focus on durable models.

Is a higher CCA always better?

Not necessarily. While higher CCA provides better cold-weather starting, it may come with a larger physical size or higher cost. Choose a battery with CCA at or slightly above your vehicle’s requirement. For Subaru, 550, 700 CCA is typically sufficient.

Our BMW battery guide discusses high-CCA needs for luxury cars.

Can I replace my Subaru battery myself?

Yes, it’s a straightforward DIY job on most Subaru models. You’ll need basic tools (wrench, socket set) and safety gear. Disconnect the negative terminal first, then positive. After installation, you may need to reset the clock and radio presets.

For step-by-step help, see our Hyundai battery guide for similar procedures.

Does the Optima RedTop fit all Subaru models?

The Optima RedTop 35 (Group 35) fits many Subaru models, but not all. Always verify dimensions and terminal orientation before purchasing. The RedTop 25 is an alternative for vehicles requiring Group 25. Our Toyota battery guide covers similar fitment considerations.

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