How does an AGM (Absorbent Glass Mat) battery differ from a wet cell battery?

An AGM (Absorbent Glass Mat) battery differs from a wet cell battery primarily because it contains no liquid electrolyte. Instead, AGM batteries use a fiberglass mat to absorb the electrolyte solution, which allows the electrolyte to be immobilized within the mat. This design makes AGM batteries more resistant to spills and vibrations, providing better performance in a variety of conditions.

The lack of liquid electrolyte is significant because it allows AGM batteries to be mounted in various orientations without the risk of leakage, making them suitable for applications where space and positioning are critical. Additionally, this feature enhances safety and reduces maintenance, as there are no fluids at risk of evaporation or spillage.

The other options do not correctly define the differences between AGM and wet cell batteries. AGM batteries typically have a higher Cold Cranking Amp (CCA) rating than comparable wet cell batteries, they are often more compact rather than larger, and they generally have a longer lifespan due to their sealed design and lower self-discharge rates.