The AGM batteries have extremely low internal resistance due to their unique construction. In turn, this makes it possible for them to deliver enough power bursts when needed, such when a battery needs to be started. These batteries react to loading more effectively than any other battery available because of this property. AGM batteries have a rapid charging time. When using the same power source, the charging rate for sealed lead-acid batteries can be up to five times faster than for flooded batteries of a comparable capacity.