Ultra-Pure Demineralized Electrolyte precision filled to exacting levels for extended life; Fortified Posts, Straps, And Welds resist vibration damage, maximize current transfer; Handles included for convenient installation and transportation; Maintenance-free design means no adding water; Heavy-Duty Power-Perform Plates withstands temperature extremes while maximizing power and energy storage capacity; Enhanced Crystallization of Power-Perform plates provides more power-per-pound; Short-Protector Separators have thicker backweb material that prevents plate-to-plate shorts; Flush Cover Design enhances overall battery performance, maintenance, safety, and convenience.