What Is An AGM Battery and How Long can it Last?

Used initially in military aircraft in the 1980s, AGM batteries have proven to be highly effective and versatile. Today, AGM batteries are a popular choice not only for vehicles but also for solar energy storage, owing to their innovative design and performance.

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So, why should you choose AGM batteries, and what do they entail? This can be understood by exploring What is an AGM battery?

What Is An AGM Battery?

To understand "what is an AGM battery," we first need to know "what does AGM stand for?" AGM stands for Absorbent Glass Mat, a notable battery technology that utilizes a fiberglass mesh between battery plates, maintaining the electrolyte suspension and effectively separating positive and negative plates.

In essence, the meaning of AGM battery refers to a type of advanced lead-acid battery.

How Do AGM Batteries Work?

Understanding AGM battery technology requires some technical knowledge. These batteries feature a high discharge rate and operate efficiently over a wide temperature range. This reliability comes from the encased structure and the absorbent glass mat that retains the electrolyte.

The absorbent glass mat, also known as the AGM separator, is ultra-thin, placed between lead plates, and saturated with the electrolyte. Its chief function is to absorb and immobilize the electrolyte, maximizing the reaction surface with the battery plates. This structure also makes AGM batteries easy to maintain and transport.

Pros and Cons of AGM Batteries?

AGM batteries, with their robust structure, outshine their counterparts like gel and flooded batteries in terms of cost and performance. However, they have limitations, particularly under high voltage conditions.

Pros:

1. Spill-proof
2. Resistant to vibrations and shocks
3. Perform well in colder temperatures
4. Can be installed in any position
5. Minimal gassing
6. Low self-discharge rate
7. Longer lifespan compared to SLA batteries
8. Maintenance-free

Cons:

1. Higher cost due to complex manufacturing
2. Sensitivity to overcharging and high voltages
3. Need to be topped off regularly
4. Require AGM-specific chargers
5. Inaccuracy with older battery testers

How Long Does an AGM Battery Last?

In start-stop applications, AGM batteries typically last between six to eight years, depending on operating conditions and depth of discharge. Over time, battery performance may degrade, impacting overall lifespan.

Common AGM Battery Applications

Start-stop applications:

AGM batteries can provide short, intense bursts of energy, making them ideal for starting engines in vehicles like cars, trucks, and RVs.

Deep-cycled applications:

AGM batteries can deliver a steady current to appliances in vehicles, ensuring reliable operation.

Solar energy storage applications:

AGM batteries are also well-suited for solar energy storage, offering robust performance and can be connected for higher capacity.

AGM Battery vs Lithium & AGM Battery vs Standard Battery

There are four main types of batteries: Flooded, AGM, Gel, and Lithium Iron Phosphate, each with distinct technologies.

• Flooded: Uses lead plates in free-flowing electrolyte.
• AGM: Uses a fiberglass mat to hold the electrolyte.
• Gel: Uses a gel form to immobilize the electrolyte.
• Lithium Iron Phosphate: Utilizes lithium iron phosphate.

Lead-acid batteries (Flooded, AGM, Gel) and Lithium Iron Phosphate batteries each serve different purposes. When capacity is a priority, lithium batteries are the best choice despite their higher cost. A comparison of these types shows AGM batteries' advantages in longevity.

Need more information on What is the difference between an AGM battery and other batteries?? Feel free to contact us.

Are AGM Batteries Worth It?

It depends on your needs. For vehicles, AGM batteries are a superior choice for starter engines, providing better quality, longer lifespan, and less maintenance. For solar energy storage, lithium-ion batteries, though more expensive, offer higher efficiency and longer lifespan.

How do I know if my battery is AGM? 3 Steps

#1 Check Manufacturer’s Labels

Look for battery type information on the labels or user manual.

#2 Observe the Top

AGM batteries have protruding terminals on their flat top.

#3 Slightly Shake the Battery

If it feels solid inside, it’s likely an AGM battery.

Q&A

Are AGM batteries deep cycle?

Yes, most AGM batteries can discharge up to 80%. They are highly preferred for deep cycle applications.

What type of batteries are best for solar power?

AGM, gel, lithium iron, and flooded lead-acid batteries are commonly used, each varying in efficiency, maintenance, and cost.

Can I wire different battery types and sizes together?

It is best to use batteries of the same type and size to avoid efficiency loss. Ensure all are AGM when pairing with an AGM battery.

How long does it take to charge a 12v 100ah AGM battery?

Charging time varies based on sunlight, temperature, and specific battery. Generally, with three 100 Watt solar panels, it takes about 4 hours.

Are AGM Batteries Good for RVs and Boats?

Yes, due to their high voltage output, AGM batteries suit both starting engines and powering onboard appliances.

Can You Charge an AGM Battery with a Regular Charger?

No, AGM batteries require a specific charger designed for their needs.

Takeaways

Understanding "what is an AGM battery type" and identifying it can guide you in making informed choices for vehicles or solar systems. For a variety of reliable options, kete offers AGM, gel, and lithium iron phosphate batteries, each tested and manufactured for quality.

For more details, visit What is an AGM battery?.