Red Top RT U 3.7 Optima Battery

Unlike traditional lead acid batteries that use stacks of thick lead plates suspended in a reservoir of acid, OPTIMA® batteries feature two long pure lead-tin plates wound into a tight spiral, separated by an absorbent glass-mat (AGM). The sponge-like AGM holds the electrolyte in place between the plates. The SPIRALCELL® design eliminates plate-to-plate movement and shedding of the active lead past material, a common cause of battery failure.