The Best Subaru Car Battery
Find the right battery for your Subaru with our expert picks. We compared AGM and flooded options, CCA ratings, and group sizes to recommend top performers from Optima, ACDelco, Weize, and Mighty Max.
By Jerry Daniels
Updated September 11, 2026
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.
| Award | Product | BP Score About BP ScoreThe BP Score is our own rating from 0 to 10, based on performance, design and build, ease of use, and value. It reflects independent research and is never influenced by manufacturers, retailers, or affiliate commissions. Learn more › | Price | |
|---|---|---|---|---|
Mighty Max Battery MM-H5 12V 60Ah AGM
|
8.2/10 | $149.99 | Buy | |
| Best Overall |
OPTIMA 35 REDTOP 12V AGM Battery
|
9.6/10 | $248.61 | Buy |
| Best Budget |
Mighty Max MM-G35 12V 55Ah AGM Car Battery
|
9.5/10 | $149.99 | Buy |
| Best Value |
ACDelco Gold 48AGM BCI Group 48 Battery
|
9.5/10 | $182.99 | Buy |
| Best Premium |
OPTIMA REDTOP 25 AGM Battery
|
9.5/10 | $252.11 | Buy |
Weize Platinum AGM 60Ah 680CCA Battery
|
9.4/10 | $149.99 | Buy | |
Weize Platinum AGM Battery Group 35
|
9.4/10 | $159.99 | Buy |
Mighty Max Battery MM-H5 12V 60Ah AGM
A sealed AGM battery designed for reliable cold-weather starts with 680 CCA and 100-minute reserve capacity. The spill-proof construction and multi-position mounting make it practical for most vehicles, though installation requires separate wire harness and mounting accessories.
Pros
- Strong 680 CCA cold cranking amps deliver consistent starting power in any season
- AGM sealed design eliminates spills and requires no maintenance
- 100-minute reserve capacity extends runtime and overall battery lifespan
- Rugged construction resists shock and vibration for reliable performance
- ISO-certified manufacturing and CE standards compliance, backed by 3-year warranty
Cons
- Wire harness and mounting accessories sold separately, adding to installation costs
- Limited to standard mounting positions, excluding upside-down installation
OPTIMA 35 REDTOP 12V AGM Battery
OPTIMA's sealed AGM battery delivers robust cold-cranking power with 720 CCA and minimal maintenance demands. Its spiral-cell design provides better vibration resistance and longevity than traditional flooded batteries, making it a solid choice for vehicles with moderate to high electrical demands.
Pros
- 720 Cold Cranking Amps provides reliable starting in cold weather
- SPIRALCELL technology with 99.99% pure lead outperforms conventional batteries
- Up to 3 times longer lifespan versus standard flooded batteries
- 15 times more vibration resistant for durability in rough conditions
- Maintenance-free sealed AGM design
Cons
- Higher weight at 31.7 pounds may require secure mounting
- Premium pricing typical of AGM batteries limits budget-conscious buyers
Mighty Max MM-G35 12V 55Ah AGM Car Battery
A sealed AGM battery designed for reliable cold-weather starting with 650 CCA and 100-minute reserve capacity. The spill-proof construction and multi-position mounting make it practical for most vehicles, backed by a 3-year warranty and ISO-certified manufacturing standards.
Pros
- Strong 650 CCA rating ensures dependable starts in harsh weather conditions
- 100-minute reserve capacity extends runtime and overall battery lifespan
- Sealed AGM design eliminates spills and reduces maintenance requirements
- Rugged construction resists vibration and shock across temperature extremes
- ISO-certified facility and CE standards compliance for quality assurance
Cons
- Wire harness and mounting accessories sold separately, requiring additional purchases
- Cannot be mounted upside down, limiting installation flexibility in some vehicle configurations
ACDelco Gold 48AGM BCI Group 48 Battery
ACDelco's AGM battery delivers robust construction with calcium-lead grids and enhanced alloy technology designed to extend cycle life and performance. The puncture-resistant separator and acid-resistant vent cap minimize leakage risk, while improved acid circulation helps maintain cooler operating temperatures. Best suited for drivers seeking a reliable OEM-grade battery with a 36-month warranty backing.
Pros
- High-density negative paste and silver calcium alloy enhance cycle life and durability
- Calcium-lead positive grid maximizes conductivity and reduces internal resistance
- Puncture-resistant envelope separator improves acid circulation and thermal management
- Acid-resistant vent cap design reduces leakage risk
- 36-month warranty provides long-term peace of mind
Cons
- Standard sizing limits compatibility to specific vehicle models requiring BCI Group 48 format
- Premium positioning may carry higher upfront cost compared to conventional batteries
OPTIMA REDTOP 25 AGM Battery
The OPTIMA REDTOP 25 is a sealed AGM battery built for reliability. Its Spiralcell technology delivers strong starting power even in bad weather, and it resists vibration far better than standard flooded batteries.
Pros
- Spiralcell technology with 99.99% pure lead for consistent power
- 720 cold cranking amps for reliable starts
- 15 times more vibration resistant than flooded batteries
- Up to 3 times longer life than standard flooded
- Maintenance free with 90-minute reserve capacity
Cons
- Heavy at 32 pounds
- C20 capacity of 44 AH may be low for high-demand accessories
- SAE posts may not fit all terminal types
Weize Platinum AGM 60Ah 680CCA Battery
This Group 47 AGM battery delivers 680 cold cranking amps and 60Ah capacity, designed specifically for vehicles with start-stop technology and higher electrical demands. Its advanced construction resists vibration and internal corrosion, making it a solid fit for cars, trucks, and SUVs that need dependable cold-weather starting power.
Pros
- High 680 CCA rating ensures reliable cold-weather starting performance
- Up to 2x cycle life compared to conventional batteries with faster recharge capability
- Maintenance-free, leak-proof AGM design with vibration resistance
- Optimized for modern start-stop vehicles and accessory-heavy electrical systems
- 36-month warranty and verified dimensions (9.52" L x 6.89" W x 7.48" H) for easy compatibility checking
Cons
- Not suitable for deep-cycle applications like marine or solar projects, limiting versatility
- Requires careful terminal position verification (left negative, right positive) before purchase to avoid fitment errors
Weize Platinum AGM Battery Group 35
This AGM battery delivers 650 CCA and 55AH capacity, making it a dependable choice for stop-start and luxury vehicles. Its heat and cold resistance plus low self-discharge enhance reliability.
Pros
- Up to 2x cycle life of conventional batteries
- Excellent heat and cold resistance
- Low self-discharge for long storage
- Leak-proof enhanced safety design
Cons
- Not designed for deep-cycle solar or marine use
- Requires careful verification of dimensions and terminal position
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 8.2 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 9.5 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.
About the author
Jerry covers car batteries and tires for BestProducts, focusing on cold cranking power, tread life, and wet weather grip. He turns dense ratings and warranty terms into plain guidance for drivers who want parts that go the distance.