Did your vehicle come from the factory with a flooded lead acid battery? If so, you can upgrade to an AGM battery and reap the benefits of its more durable, maintenance-free design. When the AGM battery dies, you can replace it with another AGM or go back to a normal battery. Keep in mind that AGM and flooded batteries are both lead-acid: the chief difference between them is that flooded batteries have liquid acid between the lead plates while AGM batteries hold the acid in absorbent fiberglass mats.