The Best AGM Battery No One Knows About

Back in the summer of 2013, we sang the praises of the Drakon labeled Pure Lead Acid AGM battery. It was indeed among the best AGM batteries in the world and went head-to-head with the undisputed king-of-the-hill EnerSys and their Odyssey Extreme battery. However, after some mergers and acquisitions, the brand owner, Universal Power Group, restructured and decided to consolidate labels creating greater continuity for their organization. The Drakon name no longer exists and has been transported into the very popular Kinetik battery family. Incidentally, Kinetik Power now has a full line of batteries for powersports, car audio, backup systems and even consumer alkaline and button cell batteries. Their HC-PRO series still utilizes the thin plate pure lead AGM technology first introduced under the Drakon label.

I say all this because there is a very distinguished battery factory in the heart of this great nation that produced the inner workings of the Drakon battery and very few consumers know about them. Their facility is state-of-the-art and the envy of the battery world. They established their presence in 2000 and focused initially on the telecom industry. They then began to private label AGM pure lead dual purpose automotive batteries for various multi-nationals and big box stores as well as for other independently owned and operated battery brands. But a couple years ago, they had an epiphany.

Without much fanfare, NorthStar Battery Company began placing the NorthStar name on their deep cycle marine and automotive batteries. They started marketing their line direct to consumers and businesses. They obviously still private label for companies, and still dominate in their core market. They recognized the world needed to know they truly are the leading manufacturer of all types of sealed AGM thin plate batteries. No longer did they wish to reside in the shadow of Enersys.

The Best AGM Battery Contenders

Many people trumpet the spiral celled OPTIMA as the best AGM battery. They have an eye catching unique shape and employ a color scheme that is almost a brand unto itself: RED Top, YELLOW Top, and BLUE Top. OPTIMA batteries are loved by many people. They are widely distributed and spend a lot of money on marketing. There is no doubt they have some great aspects such as being one of the most resistant to vibration damage. The tightly bound spiral cells are extremely vibration resistant perhaps making them the preeminent choice. But when it comes to overall power density for traditional BCI Group sizing’s they lag behind the industry titans.

As alluded to earlier, Odyssey Batteries (Enersys) are widely acknowledged to be the best AGM sealed lead acid battery available. The core of their business grew from supplying these pure lead AGM batteries to power the US military’s rolling stock. Their advantage has always been the use of pure lead ingots vs. utilizing some sort of lead alloy. There is no disputing that the Odyssey battery lineup is indeed amazing, but they can no longer claim dominance alone!

Like Odyssey, NorthStar uses 99.997% pure lead to manufacturer their batteries. The lead is compressed into a reinforced ABS plastic shell to increase power density and prevent case cracking. The industrial and commercial users are still the primary focus as they realize the value in lowering their overall cost of acquisition. When you calculate the total cost of ownership inclusive of purchase price, labor for maintenance and replacement, and costs associated with a vehicle being out of service, corporations quickly realize how inexpensive these pure lead AGM batteries are and see the savings go straight to the bottom line.

Back in August we asked the question “Who Makes the Best Group 34/78 Battery?” The three brands talked about today were on that list. The analyses looked at each battery from different viewpoints to help shine some light on some overlooked factors. Today we will compare the BCI Group 31 marine battery for only these three top brands.

Comparing OPTIMA, Odyssey and NorthStar Group 31 Marine Batteries

*The retail cost is taken from the manufacturers online store. Those prices may or may not include freight charges.

The side-by-side AGM battery comparison reveals some interesting observations. OPTIMA lags behind in top line metrics because, as the weight hints at, it cannot produce enough output with the limited shape. The cylindrical shaped cells do not use up all the available space of a rectangle meaning it has less active material in comparison with its competitors. But in relation to a conventional marine battery it would be preferred.

The Odyssey battery and North Star battery in Group 31 seem to go tit-for-tat matching each other's metrics except for two. The Reserve Capacity (RC) and Amp Hour (AH) rating are both slightly higher for NorthStar. So the question was asked: Who makes the best AGM battery? Based on these observations and the price the manufacturers are selling the batteries for we have placed NorthStar battery ahead of Odyssey as the best AGM battery brand in the world. The slightly higher RC and AH with all else being equal made the price the ultimate tipping point. Two incredible brands making dual purpose starting / deep cycle batteries right here in the USA!

If you are interested in purchasing one of these featured best AGM marine batteries they can quickly be accessed by clicking on the image in the top left corner of this blog page. Feel free to submit comments or questions.

Key Features of a Good AGM Battery

A good AGM (Absorbent Glass Mat) battery should provide reliable power, long service life, and consistent performance under different operating conditions. Unlike traditional flooded batteries, AGM batteries are sealed and use fiberglass mats to absorb the electrolyte, making them maintenance-free and more resistant to leaks. However, not all AGM batteries are built to the same standard. Understanding the key features can help you choose a battery that delivers the best value and performance for your needs.

One of the most important features is strong starting power. A quality AGM battery should offer high Cold Cranking Amps (CCA), which measure the battery's ability to start an engine in cold temperatures. Higher CCA ratings generally indicate better starting performance, especially for vehicles, motorcycles, boats, and powersports equipment used in harsh weather. Reliable starting power ensures the battery can deliver sufficient energy when it is needed most.

Another essential feature is durability and vibration resistance. AGM batteries are commonly used in applications where equipment experiences frequent movement or rough terrain. A well-built AGM battery is designed with tightly packed internal components that reduce damage from vibration and shock. This makes AGM technology particularly suitable for ATVs, UTVs, motorcycles, RVs, and marine applications where battery reliability is critical.

Long cycle life and fast recharge capability are also key advantages of a good AGM battery. Cycle life refers to how many times a battery can be discharged and recharged before its performance begins to decline. High-quality AGM batteries typically withstand more charge cycles than standard flooded batteries. In addition, they can accept a charge more efficiently, reducing downtime and helping users get back on the road or water faster.

Finally, a good AGM battery should be maintenance-free and backed by a solid warranty. Since AGM batteries are sealed, there is no need to add water or perform regular electrolyte checks. This convenience makes them attractive for both casual users and professionals. A strong manufacturer warranty also provides confidence in the battery's quality and longevity. When evaluating AGM batteries, focus on starting power, durability, cycle life, recharge performance, and warranty coverage rather than brand popularity alone. These features will help you identify a battery that delivers dependable performance for years.

Frequently Ask Questions (FAQs)

What makes an AGM battery different from a traditional flooded battery?

AGM (Absorbent Glass Mat) batteries use fiberglass mats to hold the electrolyte, making them spill-proof, maintenance-free, and more resistant to vibration than traditional flooded batteries.

How long does a quality AGM battery typically last?

A high-quality AGM battery can last anywhere from 3 to 7 years, depending on usage, charging habits, climate, and maintenance.

Are AGM batteries worth the higher price?

Yes. Although AGM batteries cost more upfront, they often provide better reliability, longer lifespan, faster charging, and improved performance in demanding applications.

Can I replace a standard lead-acid battery with an AGM battery?

In most cases, yes. However, you should verify that the battery size, voltage, capacity, and charging system are compatible with AGM technology.

Do AGM batteries require special maintenance?

No. AGM batteries are sealed and maintenance-free, meaning you do not need to add water or regularly check electrolyte levels.

What are the signs that an AGM battery is failing?

Common signs include slow engine cranking, reduced runtime, difficulty holding a charge, voltage drops, and battery swelling or physical damage.

Which applications benefit most from AGM batteries?

AGM batteries are ideal for motorcycles, ATVs, UTVs, boats, RVs, powersports vehicles, backup power systems, and vehicles with high electrical demands.

Wrapping Up!

In conclusion, the best AGM battery is not always the most popular or expensive one. Many lesser-known AGM batteries deliver excellent durability, strong starting power, and long service life while offering better value than premium brands. The key is choosing a battery that matches your vehicle's requirements, climate, and usage habits. By focusing on performance, reliability, warranty coverage, and customer reviews rather than brand recognition alone, you can find an AGM battery that provides dependable power for years without overspending.