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Absorbent Glass Mat (Battery) ("AGM")

Absorbent Glass Mat (Battery) ("AGM")

An Absorbent Glass Mat ("AGM") battery is an electrochemical (galvanic) cell and type of valve regulated lead–acid (VRLA) battery designed to generate an electrical current. An AGM battery is characterised by lead plates seperated by an electrolyte suspended in a woven fibreglass mat encased in a rigid inert (plastic) enclosure.

The plates in an AGM battery may be of any shape (flat, round, rolled, etc) depending on the required application. The fibers that compose the fibreglass mat are inert and not chemically affected by the electrolyte. The rigid plastic enclosure of an AGM battery is sealed, incorporating a pressure relief valve.

Depending on the manufacture and approval of an AGM battery, it may be utilised as an engine start battery and/or a standby battery.


In preparing this definition, we have drawn from various sources including Legislation, Codes, Standards and industry information, research and knowledge.  Like the english language, these definitions may subtly change from time to time. As such these definitions are provided solely on the basis that users will be responsible for making their own assessment of the definition and and are advised to verify all relevant representations, statements and information.