Get your car started and running again with the REDTOP high-performance AGM Spiralcell Battery, Group Size 35. It delivers a strong burst of ignition power for a reliable start-up and extreme resistance to the most common causes of battery failure. The heart of OPTIMA SPIRALCELL TECHNOLOGY is a series of individual spiral-wound cells composed of two pure (99.99%) lead plates coated in a precise coating of lead oxide. This breakthrough in battery design delivers more power and consistently outperforms conventional flat-plate batteries. Sealed Absorbed Glass Mat (AGM) batteries like OPTIMA Batteries do not spill, sulfate or degrade like flooded batteries do. This results in higher efficiency when both discharging and recharging.