Battery – Uses a fiberglass-like separator to hold the electrolyte in place. The physical bond between the separator fibers, the lead plates, and the container makes it spill-proof and the most vibration and impact resistant lead-acid battery available today. It uses almost the same voltage set-points as a wet/flooded cell and thus can be used as drop-in replacement for a wet/flooded cell.

A technique for sealed lead-acid batteries. The electrolyte is absorbed in a matrix of glass fibers, which holds the electrolyte next to the plate, and immobilizes it preventing spills. AGM batteries tend to have good power characteristics, low internal resistance, and good behavior during charging.