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Best AGM Battery For Boat 2021 [Review]: What Are Pros And Cons Of AGM Battery?

Are you looking for the best AGM battery for boat? Are there so many AGM battery for marine uses out there that make it impossible to make an easy choice?
We understand that and we’re here to help. We have spent a lot of time and effort researching and selecting the best AGM battery for marine use so you can simplify your selection.
We have tested many AGM batteries for marine from a variety of brands and selected some of the best. All are assessed objectively and based on real experience.
Below is a list of the most ideal AGM batteries on boats with some helpful information.

Top 4 Best AGM Battery For Boat 2021 [Review]

#1 VMAXTANKS VMAX 12 Volt 35AH AGM Battery Marine (Editor’s Choice)


VMAXTANKS is a reputable manufacturer and you can count on the quality of this AGM battery. We have tested quite a few AGM battery models from this manufacturer and found that this 12 volt model is of the best quality.
In terms of looks, nothing could complain about. It has a very sturdy glossy black bezel and comes with a quality handle. So you can easily move up and down the boat.
This glossy black casing is also sturdy and carefully machined, leaving no open structure that allows water to enter. The AGM design prevents liquid spills, so this marine batter should not cause chemical accidents.
This AGM battery is also very resistant to shock and vibration. Even with old boats, strong vibration does not affect its performance. It also minimizes the occurrence of fire accidents.
In terms of performance, we appreciate this AGM battery’s ability to recover from a deep discharge. It is stable and does not require regular maintenance. There is also no need to frequently add water to this battery or check the electrolyte.
Besides, this AGM battery also comes with a reasonable price compared to the quality of its performance. In general, we do not find any serious weaknesses of this model.

#2 XS Power D6500 XS Series 12V 3,900 Amp AGM Battery (High Output)


We also appreciated this AGM battery from XS Power. Although this model is not as famous and popular as the one from VMAXTANKS, it has really impressive performance quality.
This AGM battery has an impressive design, durable and very flexible. The small volume of this model allows you to easily move it from land to ship and vice versa. You can mount this AGM battery in any suitable position on the boat.
This AGM battery also comes in a variety of options from 12V 12 pounds, 14V to 16V 30 pounds. From there you can easily choose the model with the right capacity.
It also has an absolute spill-resistant design, minimizing fire accidents caused by solvent spills. It also has strong vibration and shock resistance, so the performance of the AGM battery is always maintained at a stable level.
This AGM battery uses the highest energy density. That means that it always provides powerful and stable power to the equipment on board.

#3 Interstate Batteries 12V 35AH Sealed Lead Acid AGM Battery (Maintenance-free)


If you love AGM batteries that do not require frequent and complicated maintenance, this model is the ideal choice for you. This AGM battery from Interstate Batteries is a maintenance-free model that is easy to use and will deliver power for a considerable length of time.
This AGM battery is designed completely sealed, does not allow the liquid inside the battery to have any chance of spilling out. You also do not have to spend a lot of time and effort to continuously replenish the battery to function properly.
This model is quite light weight, only about 23 pounds along with compact dimensions. That allows you to place it in a variety of positions on the boat, you can hang it on or place it in any position you feel appropriate.
It can provide continuous energy for many hours. Full charge times are also very fast and shorten your time on land. It also has high output and we don’t have any complaints about the longevity of this model.
The only thing we are not satisfied with with this AGM battery is its grip. This handle has a rather flimsy design and it was cut off when we carried this AGM battery on land after a dozen moves. We don’t think it has such a low lifespan.

#4 Exide Edge Flat Plate AGM Sealed Automotive Battery (Non-spillable AGM construction)


Exide is not a very popular brand and has a high recognition, but we still tested the AGM battery from them and the results were really unexpected. This model has outstanding reserve capacity and is very stable in operation.
This AGM battery has a surprising capacity of 220 minutes, which is far above marine batteries from some well-known brands. That was our first good impression with this AGM battery.
Besides, the fully sealed design of this marine battery is also a plus. It prevents any leakage or overflow of liquid. It also does not allow any liquids such as rainwater or seawater to seep into the inside of the marine battery.
This design also doesn’t require any complicated and frequent maintenance. No maintenance required will not shorten the life of this marine battery. Just make sure not to overcharge and pay attention to the charging process.
It also comes with anti-vibration and shock resistance to prevent vibrations from damaging marine battery components. A sturdy grip on this marine battery allows for a flexible portability.
In general, during use, we did not experience any problems or experience dissatisfaction with this AGM battery. We have also read low reviews for this product but have not encountered similar situations like them. Looks like we were a little bit luckier.
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What are the Characteristics of AGM Battery?

AGM Battery became popular in the early 1980s as a sealed lead-acid battery for telecommunications systems, UPS and aircraft backup power to reduce weight and improve reliability.
Here are some of the most prominent features of the AGM battery:
Sulfuric acid is absorbed by a very fine layer of fiberglass, preventing the battery from overflowing.
This allows for easy transport of AGM batteries, minimizing the risk of acid leakage and explosion.
The AGM battery’s surfaces are flattened to resemble a standard water-based lead acid battery in a rectangular shape.
AGM batteries have low internal resistance, are capable of high currents on demand and provide relatively long lifespans, even when discharging deeply over 90%.
The AGM battery is maintenance-free, providing greater reliability and is lighter than water-based lead acids.

What are the Pros and Cons of AGM Battery?

#1 Pros

Conventional lead-acid batteries need to be fully charged every six months to prevent accumulation of the sulfation process causing the bottle. But with AGM batteries, it is less sulfated and can be stored longer before needing to be charged.
AGM batteries have good electrical charge and are long lasting at low temperatures (optimal at room temperature 25 degrees C) thanks to low internal resistance.
The leading advantage of AGM batteries is the time it takes to charge the batteries fully up to five times faster than the Water Acid version and the ability to deep discharge.
UPS AGM batteries achieve discharge depths above 80%. On the other hand, aqueous acid is only 50% to achieve the same life cycle.

#2 Cons

The downside of AGM batteries is their slightly smaller instantaneous discharge capacity and higher production cost than water-acid batteries, but cheaper than GEL batteries.
The application of Acquy AGM in practice
Most AGM batteries are medium capacity and range from 30 to 100Ah.
They are widely used in the UPS Backup Power System, large and small depending on usage needs because of their deep discharge properties and high durability.
In addition, AGM batteries and batteries are also used in high-end vehicles: motor vehicles, large displacement cars, and military aircraft thanks to their anti-vibration capabilities.
Batteries and AGM batteries are sealed in a casing, preventing leakage. AGM reduces acid spills during accidents, reducing weight for the same performance. Due to their good performance in cold temperatures, batteries and AGM batteries are also used for marine, factory and robot applications.
AGM technology applies a lot to the start-stop function of cars. The classical water acid although has good discharge ability, but if discharging, recharging and discharging many times will cause the capacity to drop rapidly after only 2-3 years of use.

Note

AGM technology is very sensitive to overcharging. A charge of up to 2.40V / cell is adequate.
However, the floating charge should be reduced to between 2.25 and 2.30V / cell (summer temperatures may require lower voltages).
AGM and other airtight batteries are not suitable for high temperature environments and should be installed away from radiators, engine compartment (if applicable). Manufacturers recommend suspending charging if the battery core reaches 49 ° C (120 ° F).

Final Verdict

The above are all the most basic but very useful knowledge for you before deciding to buy yourself a battery product that best suits your needs. Hopefully, through this article, you will have the most accurate and optimal choice of investment costs.

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