Your Subaru Outback is built for adventure, but a dead battery can bring any journey to an abrupt halt. From the main engine battery that starts your car to the small cell in your key fob that unlocks it, having reliable power is non-negotiable. Proactively replacing these components is a simple yet crucial part of vehicle maintenance that ensures you’re never left stranded.
This roundup simplifies your search by highlighting ten top-rated battery options tailored for your Subaru Outback. We cover everything from high-performance AGM main batteries for dependable cold cranking amps to exact-fit key fob replacements you can install yourself in minutes, saving you time and money.
Our Recommended Batteries for Your Subaru Outback
- Key Fob Replacement Batteries for Subaru Smart Remote (Pack of 2)
- (2 Pack) CR2032 Key fob Battery Replacement for Subaru 2017-2024
- EAPP 81608AG020 / 81608YC000 POSITIVE Battery Terminal for Subaru
- Key Fob Replacement Batteries for Subaru Traditional Key CR1620 (Pack of 2)
- Elite Batteries Key Fob Batteries for Subaru Smart Remote
- ACDelco Gold 48AGM 36 Month Warranty AGM BCI Group 48 Battery
- Interstate Batteries MTX-35 AGM Auto Battery Replacement
- ACDelco Gold 94RAGM 36 Month Warranty AGM BCI Group 94R Battery
- Odyssey Battery ODS-AGM16L Extreme Series AGM Battery
- Optima Batteries 8020-164 35 RedTop Starting Battery
Key Fob Replacement Batteries for Subaru Smart Remote (Pack of 2)
Keep your keyless entry system functioning perfectly with this two-pack of replacement batteries. Designed for Subaru smart key fobs from 2015 to 2025, these batteries are an ideal solution for when your remote’s range decreases or it stops working entirely. It is vital to confirm compatibility using the fitment guide in the product images, as these are not for standard keys with a physical key sticking out.
Replacing the battery yourself is a straightforward process that takes only a few minutes and requires no programming. This simple task can help you avoid an unnecessary and potentially expensive trip to the dealership for service. Having a spare battery on hand ensures you are prepared when your key fob battery eventually loses its charge.
(2 Pack) CR2032 Key fob Battery Replacement for Subaru 2017-2024
This product offers an original OEM battery, ensuring it matches the performance and specifications of the battery that came with your key fob. It is compatible with a wide range of Subaru models from 2017 to 2024, including the Outback, Ascent, and Crosstrek. The seller emphasizes checking the second product image for a detailed compatibility list to guarantee a proper fit for your specific remote.
Beyond just the batteries, this pack includes helpful installation videos and the necessary tools, making the replacement process accessible for anyone. The batteries are noted for their long-lasting performance and extended expiry date, so you can store the spare with confidence. This comprehensive package provides everything you need for a successful and easy key fob battery swap.
EAPP 81608AG020 / 81608YC000 POSITIVE Battery Terminal for Subaru
This is a direct replacement for the positive battery terminal on a wide array of Subaru vehicles, including nearly every Outback model from 2000 to 2019. Corroded or damaged battery terminals can lead to poor electrical connections, causing starting issues and electrical gremlins. Replacing a faulty terminal is a cost-effective way to restore reliable power flow from your battery.
The terminal is built to OEM specifications, featuring an 18mm positive terminal with an 8mm stud bolt and M8 nut for a secure and solid connection. Installation is generally straightforward, requiring basic tools. This component is an essential part of your Outback’s electrical system, ensuring all the power from your main battery is delivered without interruption.
Key Fob Replacement Batteries for Subaru Traditional Key CR1620 (Pack of 2)
For Subaru owners with a traditional key fob where the metal key folds out, this two-pack of CR1620 batteries is the correct solution. It is specifically designed for older-style remotes and is not compatible with push-to-start smart key systems. The product listing includes a clear fitment guide with visual examples to help you confirm your key is a match before purchasing.
Like the smart key batteries, self-installation is quick and eliminates the need for a dealership visit. This is a simple and affordable way to maintain the functionality of your older-model Outback’s keyless entry. Keeping a fresh battery in your fob ensures you can always lock, unlock, and open the trunk with ease.
Elite Batteries Key Fob Batteries for Subaru Smart Remote
Elite Batteries offers a retail-packaged solution for Subaru smart key fobs from 2015 to 2025. The batteries are promoted for their industrial-strength construction, which aims to provide superior performance and a longer lifespan compared to standard options. As with other key fob batteries, it is critical to verify compatibility, as these are not for traditional keys.
The installation process is designed to be fast and easy, with a detailed guide available in the product description to walk you through the steps. No programming is needed, making it a hassle-free DIY task. Choosing a brand that focuses on quality can contribute to more reliable performance from your key fob over time.
ACDelco Gold 48AGM 36 Month Warranty AGM BCI Group 48 Battery
The ACDelco Gold 48AGM is an Absorbent Glass Mat (AGM) battery designed for vehicles requiring a Group 48 size. AGM batteries are known for their maintenance-free operation, spill-proof design, and resistance to vibration, making them a robust choice for the demands of a modern vehicle like the Subaru Outback. They also provide strong power for vehicles with numerous electronic accessories.
This battery features advanced technologies like a high-density negative paste and a calcium lead positive grid, which work together to improve overall performance and increase battery life. Backed by a 36-month warranty, it represents a reliable and durable option for drivers seeking a trustworthy replacement battery from a recognized automotive brand.
Interstate Batteries MTX-35 AGM Auto Battery Replacement
Interstate’s MTX-35 is a pure lead AGM battery built for longevity and dependable performance. Its design packs more lead into the battery, which is a key factor in achieving a longer service life. This battery is particularly well-suited for start-stop vehicles, which place higher demands on the battery, but it is an excellent upgrade for any Outback.
The manufacturer states that this AGM battery can offer two to three times the service life of conventional flooded batteries. It is engineered to be spill-proof and vibration-resistant, important features for off-road driving or rough roads. With 650 Cold Cranking Amps (CCA), it provides reliable starting power even in cold weather conditions.
ACDelco Gold 94RAGM 36 Month Warranty AGM BCI Group 94R Battery
For Subaru Outback models that specify a Group 94R battery, the ACDelco Gold 94RAGM is a strong contender. As an AGM battery, it offers the benefits of being completely sealed, maintenance-free, and capable of handling high electrical loads. This makes it a reliable power source for vehicles with advanced electronics and safety systems.
It incorporates features such as an enhanced life alloy and high-density plate oxide to maximize power output and extend its service cycle. The 36-month warranty provides peace of mind, affirming the product’s quality and durability. This battery is engineered to deliver consistent power and dependable starts.
Odyssey Battery ODS-AGM16L Extreme Series AGM Battery
The Odyssey Extreme Series is built for high performance and exceptional durability. These batteries are known for their deep-cycle capabilities, meaning they can be discharged and recharged repeatedly without significant degradation. This is a significant advantage for drivers who use power-hungry accessories or have demanding electrical systems.
Constructed with pure virgin lead plates, Odyssey batteries are designed to deliver a very long service life and provide a high burst of power for starting. They are also highly resistant to vibration, a key feature for any vehicle that sees gravel roads or off-pavement use. This battery is a premium choice for the Outback owner who needs maximum reliability.
Optima Batteries 8020-164 35 RedTop Starting Battery
The Optima RedTop is a legendary AGM battery recognized for its distinctive spiral-cell design. This design contributes to its exceptional vibration resistance and ability to deliver high-power cranking amps. It is an excellent starting battery for standard automotive applications, providing reliable engine starts.
While it is primarily a starting battery, its AGM construction still offers benefits like being spill-proof and maintenance-free. The RedTop is a popular choice among enthusiasts and those looking for a rugged, dependable battery from a top-tier manufacturer. Its reputation for performance in challenging conditions makes it a fitting option for an adventurous Outback.
Buying Guide: How to Choose the Best Batteries for Subaru Outback
When my Subaru Outback’s battery finally gave out, I realized I had no idea what to look for in a replacement. It’s not just about picking the one with the right physical size. After a lot of research and talking to mechanics, I figured out the key things that matter for finding the best batteries for Subaru Outback.
The first and most critical spec is the Group Size. This is a standardized number that tells you the battery’s physical dimensions and terminal layout. For most Subaru Outback models, you’ll be looking for Group 35 or Group 25. Getting this wrong means the battery simply won’t fit in the tray. Always double-check your owner’s manual or the label on your old battery to be sure.
Next up is Cold Cranking Amps (CCA). This measures the battery’s ability to start your engine in cold weather. A higher CCA rating is a good thing, especially if you live where winters are harsh. For an Outback, I generally look for a battery with at least 600 CCA, but going higher (like 700 or more) provides a nice safety margin. The last major power rating is Reserve Capacity (RC), which tells you how long the battery can run your car’s essential electronics if the alternator fails. A higher RC is always better.
You’ll also need to decide on battery technology. The standard and most affordable option is a flooded lead-acid battery. They work fine but may require occasional water checks. Absorbent Glass Mat (AGM) batteries are a premium choice. They’re sealed, spill-proof, more vibration-resistant, and generally have a longer lifespan. Many newer Subarus come with AGM batteries from the factory because they handle the demands of start-stop systems better. If your Outback has this feature, an AGM battery is highly recommended.
Finally, consider the warranty. It’s a good indicator of the manufacturer’s confidence in their product. Look for a solid free-replacement period. A battery with a 3-to-5-year free replacement warranty is typically a higher-quality unit than one with only a 1-year free replacement. Paying a little more upfront for a battery with a better warranty can save you money and hassle down the road.
FAQ
What is the typical Group Size for a Subaru Outback battery?
Most Subaru Outback models from the last decade use a Group 35 battery. However, some older or specific trims might use a Group 25. It’s absolutely essential to verify this before you buy. The best way is to look at the label on your current battery or check the specifications in your vehicle’s owner’s manual. Using the wrong group size will lead to a battery that doesn’t fit your car’s tray and could have terminal issues.
Is an AGM battery worth the extra cost for my Outback?
In my opinion, yes, especially if you plan on keeping your Outback for a long time or if it has a start-stop system. AGM batteries are more durable, handle deep discharges better (which is good if you use accessories with the engine off), and are completely maintenance-free. They are a more robust and reliable power source, making them one of the best batteries for Subaru Outback vehicles, particularly for dealing with extreme weather and demanding electrical loads.
How often should I replace my Subaru Outback’s battery?
There’s no single answer, as it depends on your climate, driving habits, and the battery’s quality. On average, a car battery lasts between 3 to 5 years. In very hot climates, the lifespan might be on the shorter end of that range due to accelerated internal corrosion. If your engine is cranking slowly, your headlights are dimming, or you’ve needed a jump-start more than once, it’s definitely time to test your battery and likely replace it.
Can I install a new car battery myself?
Yes, it’s a fairly straightforward job if you’re comfortable with basic tools and safety procedures. You’ll need a wrench set to loosen the terminal connectors. The most important rule is to always disconnect the negative terminal first and reconnect it last to prevent short circuits. Be careful when lifting the old battery out, as they are quite heavy. If you’re not confident, having a professional install it is a quick and inexpensive service that many auto parts stores offer for free with purchase.
What does the Cold Cranking Amps (CCA) rating mean?
Cold Cranking Amps (CCA) is a measure of the number of amps a battery can support for 30 seconds at 0°F until the voltage drops to a point where it can’t be used. In simple terms, it’s the battery’s ability to start your car on a cold morning. A higher CCA rating means more starting power. For an Outback, I wouldn’t go below the manufacturer’s recommendation, and opting for a higher CCA is a smart way to ensure reliable starts in winter.