Absorbent glass mat (AGM) batteries have a unique design that benefits a range of applications. An integral part of AGM batteries is the AGM battery separator, which is crucial to enhancing the performance and safety of the battery. 

What Is an AGM Battery?

AGM batteries are similar to standard flooded lead batteries but have some distinct design and construction characteristics that make them better suited for particular applications. In an AGM battery, the acid is absorbed and immobilized by thin fiberglass mats between the plates. Unlike industrial flooded lead batteries, AGM batteries are maintenance-free and do not require electrolyte watering.  AGM batteries internally recombine gasses rather than externally venting.

AGM batteries have the advantage of a low internal electrical resistance, allowing AGM batteries to discharge and charge at higher rates when compared to other sealed VRLA Gel batteries. The plates in an AGM battery may be of any shape, making their design very flexible depending on the application requirements. AGM batteries are used globally for both automotive and industrial applications.

What Is an AGM Battery Separator?

Placed between the negative and positive plates of an AGM battery, an AGM battery separator is a non-conductive material that enables efficient movement of electrolytes while preventing short circuits. Typically, AGM separators are made of glass fibers and in addition, can sometimes contain acid-resistant synthetic materials.

How Do AGM Battery Separators Work?

AGM separators can absorb and retain a significant amount of electrolyte, with even and consistent distribution in the battery. They also provide a larger surface area for the electrolyte and the plates’ active materials to electrochemically react, enhancing battery performance. The AGM separator also has insulating properties that prevent the negative and positive plates from making direct contact with one another, minimizing the risk of short circuits.

AGM Battery Separator Applications


Automotive manufacturers are placing more requirements on the 12V advanced lead battery to address the CO2 emissions regulation. The 12V requirements are increasing for every powertrain vehicle to include mild and full-hybrid and the Battery Electric Vehicle (BEV). The AGM advanced lead battery has been proven in the Stop/Start powertrain and is the 12V advanced battery of choice for future powertrains to include in the BEV.


The amount of critical data that is being transmitted is growing with the dawn of the Internet of Things.  This makes the telecommunications network even more important today, and more so tomorrow as technology advances. The AGM battery plays an essential role in the telecommunications network. If the electric grid becomes unstable, AGM battery backup powers the network and ensures the flow of data and voice. 

Data Centers

Data centers depend on advanced AGM lead batteries to back up critical information stored on servers.  If the grid is unstable and is unable to provide power to a data center, then the AGM batteries power the servers. The typical data center requirement is a high rate discharge between 5-15 minutes until generators are successfully operating.

Recreational Vehicles

Recreational vehicles, such as RVs, boats, and more, use AGM batteries because of their vibration resistance and deep cycling capabilities.

Uninterruptible Power Supplies

Uninterruptible power supply (UPS) systems use AGM batteries to provide reliable power sources in backup or power outage scenarios, keeping important systems and equipment running.

Advantages of AGM Battery Separators

AGM battery separators offer the following benefits for AGM batteries:

  • Low Self-Discharge: AGM batteries feature low self-discharge rates and last longer during periods of inactivity. They can stay charged for longer periods without constant recharging.
  • Vibration Resistance: The absorbent nature of AGM separators helps make the batteries more resistant to vibrations and impacts and prevents spillage. Therefore, they are suitable for transportation or movement applications.
  • Maintenance-Free: AGM battery separators absorb electrolyte, and gases are internally recombined. Therefore, there is no need for routine watering and acid level checks, minimizing maintenance needs.
  • Improved Safety: The AGM separator’s insulating properties reduce the risk of acid spills or leaks because the mats hold the electrolyte in place. This makes AGM batteries safer for users and the environment.

Choose an AGM Separator from H&V

A wide range of applications rely on AGM batteries, and AGM battery separators are essential to their functionality and reliability. The separators can retain electrolytes, prevent short circuits, and enhance electrochemical reactions, making them ideal for modern energy storage solutions.

Hollingsworth & Vose’s AGM separators provide industry-leading pressure retention and extended battery life. Our separators are quality fiberglass sheets placed as a barrier between the positive and negative plates, absorbing and immobilizing the acid in the AGM battery. This eliminates the need for electrolyte watering or maintenance, reduces short circuits, and protects against dendrites.

Contact H&V today to learn how our AGM battery separators can benefit your application.

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