The Centennial CB12-35 12V 35Ah Group U1 Sealed Lead Acid AGM Battery is the best option for those looking for highly reliable batteries known to provide a long life-cycle. The Centennial AGM sealed construction allows for a long service life and make them dependable in everyday use. Centennial’s AGM’s provide maintenance-free operation, which means that their operation is hassle-free. The heavy duty grids, and low self-discharge of the Centennial AGM help it outlast the competition.