Absorbent Glass Mat
Battery class in which the electrolyte is bound in a glass fibre mat separator.
Because the electrolyte is fixed, an AGM battery cannot leak. It is also vibration-resistant because the separators swell after they have absorbed the electrolyte, thus protecting the grid plates from vibration and material loss. Extremely vibration-resistant heavy-duty batteries are often based on advanced AGM technology.
In addition, because the glass fiber mats lie close to the electrodes, less active electrode material is lost during each discharge-charge cycle than in conventional batteries.
AGM batteries are used in cyclical and stationary applications such as telecommunications, wheelchairs, alarm systems as well as in classic starter applications and start-stop applications.
If your car with start-stop technologies had an AGM installed, you should definitely replace it with an AGM start-stop battery. An upgrade from EFB technology to AGM is always possible. Both start-stop batteries must be registered in the car's management system after installation.