5 Best Batteries for Subaru Outback (2022 Review)

The Subaru Outback has a lot of power, nice ride height, and great handling, among other impressive features. But you can only enjoy the experience that all these bring if you have a good battery for your Outback. And when your battery dies out, your best bet is to get a top-quality replacement battery.

In this post, we’d be looking at some of the best batteries for the Subaru Outback.

best battery for subaru outback


Best Batteries for Subaru Outback: Our Top Recommendations

The Subaru Outback runs on BCI group size 34 batteries. And the market abounds with options of this size by several different brands, making it hard to make the right choice. But we’ve got you covered. Our research team has hit the market and compared some of the best group 34 batteries in a bid to figure out the best for the Subaru Outback.

Based on our comparison in terms of design technology, performance, specifications, and buyer reviews, here are the best batteries for the Subaru Outback.

1. Optima Batteries OPT 8002-002

When it comes to ranking batteries that deliver high power cranking ability even in harsh weather conditions, Optima Batteries’ OPT 8002-002 is like no other in the world. This model is generally considered to be the best on the market because it provides more than enough power to start your engine plus the fact that it is reasonably priced.


Key specifications

  • Weight:9 lbs.
  • Dimensions: 10 x 6.88 x 7.8 inches
  • Voltage: 12 volts
  • CCA: 800 A
  • Reserve capacity: 100 minutes
  • Warranty: 3 years

At the heart of the OPT 8002-002 is the AGM design to deliver value for money. Fully known as Absorptive Glass Mat, the AGM technology provides the enduring outer structure that serves as an efficient shield to eliminate potential issues of spillages, explosions, and shocks. In other words, this unit is spill-proof and mountable in virtually any position, which is helpful if you have a custom application.

The Spiral-cell technology helps deliver a strong, stable, clean power source, thus ensuring the safety of you, your family, and the environment while the case material is made of polypropylene. Thus, it is 15 times more resistant to vibration for durability.

With regards to its capabilities, the OPT 8002-002 features a 100-minute reserve capacity for uninterrupted performance, meaning if you’re far away, you get plenty more time using this battery. It also comes with a rating of 800 cold-cranking amps, which is strong enough to deliver a powerful starting burst for even larger trucks.

Another perk that comes with buying the OPT 8002-002 is that it offers faster recharging capabilities and can also serve for up to 2x the usual lifespan of conventional batteries. And with an SAE Post rating of C20, you can be sure that the optimal beginning power will continue even in bad weather. It appears the OPT 8002-002 was designed to take a beating as it is rugged and durable.

However, like every good thing, the OPT 8002-002 has its drawbacks, with the most common complaint being that its performance starts to decline after 2 years of usage, which is earlier than the expected span. Also, you will need to confirm that the 3-year warranty applies to the seller you’re purchasing the battery from. But overall, this battery is one delivers massive power to start your car when the weather drops to sub-zero temperatures.


  • Strong starting burst
  • Faster recharging
  • Comfortable weight


  • Warranty varies from seller to seller
  • Low rating of customer service

2. Odyssey 34-PC1500T

If you’ve ever searched for a great automotive battery, then you have no doubt come across the Odyssey brand. Dubbed as the battery that goes to the extremes, the 34-PC1500T is a battery of superb quality that is ranked top for deep cycling and cold-cranking capabilities. In other words, it is a dual-purpose battery that is suitable for use in automotive and marine applications.


Key specifications

  • Weight: 57 lbs.
  • Dimensions:4 x 7.4 x 6.9 inches
  • Voltage: 12 volts
  • CCA: 850 A
  • Reserve capacity: 135 minutes
  • Warranty: 4 years

The plates are made of pure virgin lead (unlike the lead alloy in most batteries), enabling the 34-PC1500T to pack in more plates. More plates mean more surface area and that translates to more power. To be precise, this battery offers twice the overall power and 3 times the service life of conventional batteries.

With a pulse hot cranking rating of 1,500 amps, the 34-PC1500T offers an enormous 5-second cranking power that is at least double that of equally sized conventional batteries, after which it drops to a consistent CCA rating of 850 amps. The reserve capacity stands at 135 minutes, which is sufficient time to sustain any load before it is fully discharged.

Furthermore, the 34-PC1500T provides up to 80 percent discharge depth and can be discharged and recharged over 400 times without any signs of decreasing capacity – high stable voltage for longer periods of time. Recharging it is also fast as you can charge it from zero to 100 percent in 2 hours.

Design-wise, the 34-PC1500T comes with an AGM technology to reduce spill and high conductivity while ensuring that it can withstand vibrations enough to keep all its connections inside and out intact. As a result, this battery is maintenance-free, requiring no water refilling or regular cleaning of the terminals.

In addition to these, the manufacturer claims that the 34-PC1500T can last anywhere from 3-10 years. To demonstrate their confidence in the battery, Odyssey stands behind it with 4 years full warranty. So if you’re looking for a 2 in 1 battery with superb performance, the 34-PC1500T is a great option.


  • High performance
  • Fast recharge
  • Easy to mount
  • Extended life cycle


  • Pricey

3. ACDelco 34AGM

ACDelco is a trusted automotive battery manufacturer and their 34AGM battery is an impressive, heavy-duty battery that you can trust to power your Subaru outback. Besides automotive uses, it is also suitable for industrial, recreational and marine applications.


Key specifications

  • Weight:7 lbs.
  • Dimensions:2 x 6.6 7.9 inches
  • Voltage: 12 volts
  • CCA: 850 A
  • Reserve capacity: 115 minutes
  • Warranty: 4 years

As the name indicates, the ACDelco 34AGM sports an AGM design, which means it is spill-proof and leak-proof, allowing for flexibility in mounting it in a variety of positions. To further prevent the possibility of leakage, the battery comes with a vent cap design, which can also arrest flame to prevent possible damage from external sparks.

Also, the battery has a high-density negative paste that increases battery life and improves performance. Recombining oxygen and restoring it back makes this model a more attractive choice.

As far as the construction is concerned, this battery is made of enhanced life alloy/silver calcium alloy that boosts the cycle life and enhances performance while the calcium lead positive grid allows for low resistance and maximizes conductivity. This also guarantees optimum pressure and thus, securing an overall uninterrupted experience.

Moving on, the 34AGM adopts increased acid circulation to keep the battery heat down so it can last for as long as possible, thanks to the sturdy envelope separator with a puncture-free back. The cooler the battery is during use, the more the chances that the lifespan will be longer.

Now to its capabilities, the battery has a CCA rating of 740 amps with a reserve capacity of 115 minutes, which is enough time to drive to your favorite auto repair shop. It will give out a powerful electric current and recharge quickly and with ease.

This particular model comes with a 42-months warranty but the average warranty rate is for 3 years only. In all, the ACDelco 34AGM is a car battery that won’t let you down when you need it most.


  • Exceptional performance
  • Super sturdy
  • Increased service life
  • Powerful discharge, fast recharge


  • Slightly expensive

4. Delphi BU9034

Delphi batteries are designed to give provide maximum power delivery, so your Subaru Outback starts when you need it to. The BU9034 is not an exception as it boasts enough power to start your vehicle and meet the demands of today’s power-hungry accessories in them.


Key specifications

  • Weight:5 lbs.
  • Dimensions:31 x 6.69 x 6.61 inches
  • Voltage: 12 volts
  • CCA: 775 A
  • Reserve capacity: 120 minutes
  • Warranty: 3 years

Straight out of the box, one of the first things that will strike you about the BU9034 is its build quality. And it is indeed well-built in that it has a reliable intrusion-safe coating that isn’t easy to scrape. In other words, the casing of this battery is fashioned to resist corrosion and maintain its neat appearance for a long time.

Being an AGM battery, the BU9034 has a special suspension system that prevents the electrolyte from escaping its structure, thus providing adequate protection against vibration, shocks, and impacts. The structure includes fortified posts, straps and welds, etc. – all of which help to keep the internal components in place and prolong the service life of the battery.

Because of its sealed structure, you can install this battery in different positions without worries about spillages and leakages. This further means that in the event of considerable shaking or non-standard positioning, the BU9034 will retain its components, enabling its efficient usage in different circumstances. The manufacturer claims that this battery has up to 20x the vibration resistance of conventional batteries.

In terms of its performance, Delphi’s BU9034 is outfitted with a cold cranking rating of 775 A while the reserve capacity is 120 minutes. Recharging it is quite fast as you can get it fully charged in less than 100 minutes.

Whether you need a battery that can power your vehicle’s accessories or you just need a battery that offers plenty of power to start your car, the BU9034 is up to the task.


  • Plenty of power to provide instant cranking
  • Full-frame battery plates to secure the power bank in it from the short circuit
  • Exceptional performance even in harsh weather conditions


  • Limited space around the battery posts allows for one only way of battery replacement

5. Deka 9A34

Deka might not be a very popular name in the automotive battery industry but they have been around for some time and have managed to build a reputation for high-quality batteries. The Deka 9A34 is a dual purpose battery as it can be used for both extreme starting and deep cycle applications.


Key specifications

  • Weight: 43 lbs.
  • Dimensions:75 x 6.875 x 6.8 inches
  • Voltage: 12 volts
  • CCA: 750 A
  • Reserve capacity: 120 minutes
  • Warranty: 3 years

Better known as the Deka Intimidator 9A34, this battery has the same casing configuration used by original equipment manufacturers, so you can be assured that it will be the perfect fit for your Subaru Outback.

The internal system of this battery is an enhanced electrolyte suspension system. It adopts the Absorbed Glass Mat technology to eliminate the need for frequent maintenance procedures since the mats have the ability to absorb more electrolytes while the vibration-protect feature safeguards the battery performance in the long run.

It has a tightly packed construction and calcium reinforced grids to provide greater resistance to shock and vibration, making it suitable also for construction and off-roading vehicles. The manufacturer claims that the 9A34 offers 20x more vibration protection than conventional batteries.

Furthermore, this battery comes equipped with a cold cranking rating of 775 A while the reserve capacity stands at around 120 minutes. This makes it possible for it to provide plenty of starting power at very low temperatures. In summary, Deka 9A34 is meant for tough and consistent performance while keeping up with the demands of your car.


  • Compact size
  • High CCA provides more power
  • Great vibration resistance
  • Superior corrosion resistant


  • Not universally compatible with all vehicle with group 35 specs

What should I look out for when buying a battery for my Subaru Outback?

When it comes to searching for the perfect battery for your Subaru Outback, you need to keep in mind that not all batteries are perfect candidates for the vehicle.

The first thing you need to look out for is the size of the battery under consideration as you want to ensure that it has the same dimensions as the stock one. You can check the different sizes of automotive batteries on the internet and compare them with yours.

Next, look for reliable AGM systems as they help keep the electrolyte in the battery by using special glass fiber walls that can absorb the fluid. The case must also be very sturdy to withstand vibrations and other mechanical influences.

Third, make sure the discharge of the battery is much lower than that of rival batteries. Also, be sure to confirm that it charges faster too – less than 2 hours.

Lastly, make sure it has enough cranking power to start your vehicle at low temperatures up to -35 degrees.

What other things should I take into consideration?

Many people often look at the price of an automotive battery and quickly make a decision whether or not to buy. However, there are other factors to take into consideration and they include:

  • The recommendations of your car’s manual
  • The CCA specs of the battery
  • The date it was manufactured – It should be recent to avoid early breakdowns in the future.

Leave a Reply