Is your battery starting to give you trouble? Are you finding it increasingly difficult to start your car? Is it becoming harder for your car to start during winters and summers, or has your car been sitting idle for too long? If you are having any of these problems, then you know that it’s time to change your car’s battery.

Naturally, you want to install the best Group 51 battery in your car to give it a brand-new life and increase its lifespan. Among the many Group 51 batteries available, our personal best is the Optima Batteries OPT8071-167 D51Yellowtop Dual Purpose Battery.

Let’s get into it and explore other options as well.

Top 7 Best Group 51 Battery Comparison

Optima Batteries 8071-167 D51 YellowTop Dual Purpose Battery is the number one, best battery on this list. This battery works well and has a special feature that makes starting my car easier, even in the winter months.

This battery has many additional features that I have come to appreciate, like the fact that the battery is fifteen times more resistant to vibration making it extra durable.

A reserve capacity of 66 minutes allows for constant performance with vehicles that have several accessories. This battery has superior power holding ability which makes it perfect for cars that are not driven as often.

I have found that the battery is going to push the limits and that it has the latest technology, helping offer a superior response that allows you to push the limits.

It features a unique spiral cell technology with individual spiral-wound cells. My car starts with more power than it did with the previous battery, it roars to life with a power I didn’t know existed.

The battery has 450 cold-cranking amps and a reserve capacity of almost 66 reserve minutes. I have discovered that this battery is truly worry-free and I never have to worry about getting stuck somewhere.

There is little to complain about with this battery. It has a warranty and oftentimes users have reported that their batteries needed replacing after three and a half years, which is just past the three-year warranty coverage. Also, the warranty is not honored through all places, so buy from reliable sources only.
  • High power holding ability
  • Maintenance-free
  • Vibration and shock-resistant
  • Strong cranking
  • The warranty is not honored through all places, make sure that you purchase from an authorized dealer to be able to use the battery’s warranty
Optima Batteries OPT8071-167 D51 YellowTop Dual Purpose Battery
Optima Batteries OPT8071-167 D51 YellowTop Dual Purpose Battery


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・Check the buying guide for YellowTop Optima batteries.

2. ACDelco ACDB24R Advantage AGM Automotive BCI Group 51 Battery

I chose the ACDelco ACDB24R AGM Automotive BCI Group 51 Battery as second place. This battery is a solid choice with good performance, the latest technology, and maximum durability.

This was one of the most durable batteries that I tested. It has the strongest road vibration protection when compared to standard flooded batteries. I have had no issues with this battery; it charges well and seems to hold a charge better than other batteries that I have owned in the past.

It features Group 51 battery AGM, an absorbed glass mat that is becoming the standard for new battery technology, and SLA, sealed lead acid. Calcium alloy is utilized for corrosion-resistance and helps to minimize the water consumption making the battery last longer.

This battery can work with specific models of SmartKey enabled cars without extra programming, for my 2007 Prius this battery worked as soon as I installed it and I didn’t have to do anything else to connect with the key.

The one main complaint that I had was you need to read the user manual before installation. While we should do this, most of us need to hook up a battery fast to get where we are going. If this battery is stored, it should be at a moderate temperature making it problematic for those who are not living in places with 70-degree weather year-round. Before installing the battery, you must ensure that it has a full charge. This requires you to have a 1500 battery tester or to purchase one. Many people have reported that batteries state that they will fit in specific car models, but do not as well as reporting that they had issues with their warranty when they had problems.
  • Easy and fast installation
  • Good charge holding period
  • Durable
  • Highly resistant to vibrations
  • Prone to temperature variations
  • Needs full charge before installation
ACDelco ACDB24R Advantage AGM Automotive BCI Group 51 Battery
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04/17/2022 12:23 am GMT
・Check out my in-depth review for the best ACDelco batteries.

3. Duracell Automotive Group 51 Battery Tractor Supply

The Duracell Automotive Group 51 Battery Tractor Supply comes from the trusted Duracell brand making it to the number three spot on here.

This battery is budget-friendly and priced far below most of the competing batteries on this list. With an affordable price, this battery is more accessible to anyone who might be financially struggling.

With all-weather protection and state of the art engineering, your vehicle will never have trouble starting again, regardless of the weather and conditions.

With a 36-month warranty and no required maintenance, I was impressed that this was a battery that I could use for at least three years without worry. The battery is assembled and manufactured in the US, so the quality is fairly high.

I have had a great experience with tractors and lawnmowers using this battery as it has weather protection allowing it to be stored in all four seasons without worry. It can not only be used for vehicles but also for lighting purposes and instruments. It also has a long service life of more than 3 years.

This battery fits most automotive brands such as Mazda, Nissan, Honda, and other vehicles. But, before buying this battery, make sure you know about your vehicle manufacturer’s recommendations.

With all of that being said, the battery is not as powerful as some of the workhouse batteries on this list. This is likely a “you get what you pay for” situation, as the battery is significantly cheaper than most other models. So, it’s a compromise between price and power. So, if you don’t want a very expensive battery, you should go for this one.
  • Free replacement for 36 months
  • Economical and affordable
  • Easy to use in all weathers
  • This battery is not available at major retailers except Sam’s Club which requires you to have a membership to purchase

4. Delphi BU9051P MaxStart AGM Premium Automotive Battery, Group Size 51P

The Delphi BU905IP MaxStart AGM Premium Automotive Battery is my pick for the 4th best battery in this class because it features many innovations and designs.

This battery is very durable and has maximum vibration resistance with optimized component compression, making it perfect for road conditions that are less than stellar.

Additionally, it features fortified welds, posts, and straps which increase its durability. This feature allows for the battery to be utilized for recreation.

With sealed housing that offers superior resistance to corrosion and a manifold venting system, I appreciate that this is not going to be a battery that causes worry.

It is a choice that features superior protection against the elements and is perfect for anyone who does not live on a paved road. It is one of the cleanest batteries after a year that I have ever seen due to the extensive corrosion protection.

The battery features a universal size and seems to fit well in most vehicles (while the size is generally universal, some batteries are slightly bigger or smaller and can cause fit issues with installation).

The battery weighs 29.5 pounds, is a lead acid-cell battery, has 12 volts of power, 325 cold-cranking amps, and 60 reverse capacity. It measures 9” x 7.7” x 4.8” and has a group 51 battery AGM battery cover included.

The battery is not the best value and costs more than some of the batteries that I experienced superior performance with. It seems to have more issues with holding power and I was not as impressed with the performance for the price.
  • Universal size
  • High durability and stability
  • Corrosion-free
  • Manifold venting system
  • The battery is known for losing its charge and many other reviewers have also experienced this same issue as me
  • There is no handle on top which makes it difficult to install and remove
Delphi BU9051P MaxStart AGM Premium Automotive Battery, Group Size 51P
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5. Powersonic 12V 35Ah Invacare New Nutron Series: R32LX, R50LX, R51LX, R51 Battery

The PowerSonic 12V 35Ah Invacare New Nutron Series: R51 Battery takes the 5th place because it is the cheapest battery that I have found that performs. This battery is unique in that it can be mounted in different directions while still offering superior resistance to shock and vibration.

The main reason for recommending this battery is its low cost. It is one of the most affordable batteries available in the market today. This battery packs power with a full 12 volts. It features SLA and AGM and is a spill-proof battery that requires no maintenance.

This Group 51 battery tractor supply is specifically made for use with recreation vehicles, tractors, and lawnmowers with bolted terminals.

Its AGM designs ensure no need to worry about acid spill-offs or even any kind of leakage. The battery is corrosion free and can be mounted in any position. Unlike acid batteries which have to be mounted in an upright position only, these are more convenient to use.

The battery has smaller dimensions which offer the chance to more easily use it in spaces where it is difficult to install/remove batteries. The battery measures 7.72” x 5.14” x 7”, is fully rechargeable, weighs 24.7 pounds, 12 volts of power, and 35 amps.

While it will fit in automobiles, this battery is not recommended for use with automobiles as it does not have cold-cranking amps. Additionally, the battery only has a one-year warranty when the industry standard is typically three years. The battery is not meant for use with automobiles. It is clunky and heavy and weighs quite a bit more than most of the other batteries on this list.
  • The battery is very affordable
  • You can mount the battery in any position
  • Easy to install
  • No spill-offs
  • Only one year warranty
  • Not meant to be used in automobiles
  • Heavy and hefty
Powersonic 12V 35Ah Invacare New Nutron Series: R32LX, R50LX, R51LX, R51 Battery
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04/17/2022 12:22 am GMT

6. Megavolt Lead Acid Flooded Car Battery BCI 51R, 12V 55AH CCA500 CA525 (51R-60-500)

The Megavolt Lead Acid Flooded Car Battery is a clunker and weighs almost thirty pounds which is why I put it in sixth place. It has good performance, but with the extra weight, it was not an easy install alone.

As a lead-acid battery, this has a maximum performance that offers superior power. It is recyclable as well which is nice if you are concerned with the environmental impact that you leave behind.

The fact that it is a maintenance-free option is great for lazy auto-owners who do not want to regularly test outputs. There are also special protections that help to keep the battery safe in all weather conditions.

The battery measures 9.29” x 5” x 8.78”, weighs 29 pounds, has 55 amps and 12 volts of power. A lower-priced battery that is easy to install. It is a maintenance-free option, making it perfect for drivers who wish to avoid maintenance.

The battery works well in all kinds of weather. It can be used for an inverter, golf cart, or can replace your garden tractor batteries.

The battery warranty information seems to be quite secretive and apparently, you don’t find out how long the warranty is good until receiving the product and reading it, which made me lose confidence before purchasing. The battery is also very heavy.
  • Affordable and economical
  • Maintenance-free
  • Recyclable
  • The battery warranty is not clear before purchasing
  • Very heavy
Megavolt Lead Acid Flooded Car Battery BCI 51R, 12V 55AH CCA500 CA525 (51R-60-500)
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7. Super Start Premium Battery Group 51

The Super Start Premium Battery Group Size 51 offers superior power and technology and is available locally in many areas, even small communities. This is why I had to include this battery on the list as it could be picked up today if your only vehicle battery died.

The battery features a two-year limited warranty and it has a long seventy-minute reserve capacity, which is longer than most batteries.

The Super Start line of premium batteries has quite the impact on starting your vehicle and it will roar to life in ways that you never imagined. The seventy-minute reserve time is superior to other batteries in the same class.

The battery measures 9.375” x 5” x 8.75”, has top post terminals, is a standard battery featuring 12 volts of power, 450 cold-cranking amps, and 555 cranking amps. It weighs 28.5 pounds. The battery makes your car start faster, in all four seasons (and with vehicles that have not been driven in a long time).

The downside to this battery is that it only has a two-year warranty which is shorter than most. It is also not as durable in off-road conditions and doesn’t offer the best protection against the weather, so the performance standards are not as high as some of the top contenders here.
  • Weatherproof
  • Good starting current
  • Powerful
  • Superior reserve time of 70 minutes
  • Many users have reported that the battery had issues with the cold crank breaking
  • Shorter warranty of only 2 years


What Is A Group 51 Battery?

They are a popular brand of dual-purpose, automobile starting batteries. They are made to be vibration-resistant Absorbent Glass Mat (AGM) Sealed Lead Acid (SLA) batteries.

Due to their dimensions, they are able to fit into almost any car battery compartment. They are available in a variety of dimensions, making it easier to find one that will fit exactly your car’s specifications.

What Is The Difference Between A 51 And 51R Battery?

Much like the group 51 batteries, 51R batteries are made to fit most cars and vary in dimensions from manufacturer to manufacturer. The difference lies in their polarity. The 51R batteries have reversed terminals. This means the positive terminal is negative, and the negative terminal is positive.

What Size Is A Group 51 Battery?

The sizes of a group 51 battery may vary from manufacturer to manufacturer. However, most fit into many car battery compartments regardless of the variations. The standard dimensions of Group 51 batteries are as follows: Length- 9.37 inches, Width-5 inches, and Height- 8.8 inches.

What Cars Can Use A Group 51 Battery?

Found in a wide variety of cars such as the Nissan GTR, Honda S2000, Honda Civics, and Japanese cars. Because it has the same height and length as the Group-35 battery but a narrower front and back, it can be utilized as a smaller/lighter version of this batter for racing.


The Optima Batteries 8071-167 D51 YellowTop Dual Purpose Battery won my vote as the best Group 51 battery with superior performance, quick full-charge times, and ease of installation. I paid careful attention to features like the ability to keep the battery well protected off-road.

There are so many Group 51 batteries that it can be frustrating to find what you are looking for. This guide offers you the details, things we love, and disappointments that you need to be sure that you are purchasing the right battery for your budget and needs.