Duracell Extreme Power and Marine & RV batteries utilize AGM or Absorbed Glass Mat Technology. With an AGM design, the battery has no free-flowing acid. Special micro-fiber glass mats absorb the acid so the battery will not spill or leak. They are held tight against the battery's power-storing components and have a lower electrical resistance for quicker starting power.

This glass mat material also helps protect and reinforce the battery's internal components making it extremely resistant to vibration or shaking damage. Reinforcing the battery's internal components also improves the battery's ability to withstand the demands of multiple accessory loads (your car or boat's many electronics). A Duracell AGM design is completely sealed and maintenance-free. It is also one of the most durable and dependable designs for car, truck, or marine batteries.