Skip to content

Why AGM Batteries Are Better: Know Before You Buy One

Why AGM batteries are better
Why AGM batteries are better

Compared to their flooded counterparts, whether AGM batteries are better or not is one of the most common questions about car batteries. There are some appropriate needs for lithium for batteries, however, the vast majority of such products that vehicles use are either flooded or AGM lead-acid batteries. For some people, it is possible to mix up between gel and AGM batteries in the case of automotive applications, but they have very different technologies. Here, we discuss clearly why AGM Batteries are better.

AGM Batteries are known as the technology marvel for their lead-acid battery system. Being the peak of engineering, they are a perfect bridge to the world’s transition into lithium-ion. And with that reputation, AGM tends to offer way more than what gel batteries have to offer.

The Science of AGM (Absorbed Glass Mat) Battery Type

AGM (or Absorbed Glass Mat) batteries are spill-proof lead-acid batteries with very low internal resistance. The glass mat is made up of thin glass fibers soaked in a sulfuric acid solution. They are directed in between the battery plates so electrolytes are absorbed. The battery plates are made of lead, expressing the sandwich construction as vibration resistance. With the aim of high electrical reliability achievement, AGM batteries are designed to have specific power, which makes them very responsive to the load. They are lighter, maintenance-free, have a low self-discharge of 80% DoD, and deliver 5 times faster charge with high currents on demand than with flood technology. They can be deep-cycled and have a long cycle of life as it can resist low temperatures.

These AGM lead-acid car batteries are commonly used in automotive applications, such as cars, trucks, etc. The AGM batteries are more resistant than the flooded counterparts because the glass mats absorb the electrolytes. It is part of the reason why matting is called an Absorbed Glass Mat. The fiberglass mats also keep the acid solutions from spilling from the batteries and protect the vehicles’ sensitive electrical components and paints. AGM batteries in structure and function are dissimilar to gel batteries and traditional flooded batteries.

Modern automobile vehicles have a start/stop technology these days, for which AGM batteries are more suitable as they can handle the increased starting demand of the vehicles. The pattern allows this technology to perform in impossible temperature ranges while the vehicle roars with better performance and can last for a longer period. Battery locations are moved to the trunk or interior to maintain better performance, making the batteries hard to access. For this, automakers look for batteries that do not need to change often. So it can be said AGM batteries can guarantee both safety and performance benefits. Many automobiles have a system for external venting in case of excessive pressure and overcharging.

Why AGM Batteries are Bette

Due to the same deep-cycle process, gel and AGM batteries often seem confusing. They both are called Valve Regulated Lead-Acid batteries where the negative plate absorbs the oxygen produced on the positive plates of lead-acid batteries and creates water. It reduces the step of watering the batteries, making it maintenance-free. Moreover, silica gels in gel batteries substitute glass mats for holding the electrolytes while making the electrons to free flow. They lose power faster, especially at lower temperatures than the AGM batteries because of the gelled composition. For AGM batteries, glass mats can work at any temperature, have high-level usage, and are cheaper with a longer life span.

Flooded lead-acid batteries are cheaper than AGM batteries but they are not long-lasting. It is the mainstream battery type that inputs a combination of liquid electrolytes. Battery plates in the Flooded Lead-acid batteries are submerged fully and creates oxygen and hydrogen gases. Water is chemically broken down in the battery so they often require water replacement. The acid (liquid electrolyte) inspection must be regularly done where a professional should measure it. High/cold temperatures input a shock on the performance as the electrolytes are caused to evaporate/freeze.

Sealed Lead Acid (AGM) Deep Cycle Battery

Check this article to know How to charge the AGM battery step by step.

Why AGM Batteries Are Better – The Pros and Cons

When discussing all the pros regarding these battery types, it must be said that you can expect zero maintenance for these batteries where watering service is not at all necessary. AGM batteries are built on the technology free of any liquid alongside minimal gassing for it to perform better than other competitive batteries used in complex applications, meaning performing maintenance is rather difficult.

When discussing all cons of these batteries, first, its users are addressed for times when charging the battery. Over/undercharging in this aspect can hugely affect the life and the performance of these types of batteries. Nonetheless, AGM batteries execute a reliable function, with their usage limited to only 50% of battery capacity discharge.

The application of AGM battery-type technologies is often part of off-grid power systems. These systems sometimes include environmentally friendly (wind and solar power) renewable energy systems. However, the function is not limited to such and expands to uninterrupted power supply systems and electric vehicle service besides robotics and a few ATVs and motorcycles.