Technically, they differ in their construction and composition. They use AGM (Absorbed Glass Mat) technology based on absorbent glass fibers, and are also more resistant to vibration and watertight because they are sealed at the time of production, although a valve ensures that pressure is maintained.
In addition to their longevity, SLA-Max batteries are ready for use, with activation and final charging in Europe rather than Asia. This has the advantage of guaranteeing a maximum load level and avoiding any handling, apart from assembly. There''s no need for a charging cycle, since they''re only activated before delivery. And there''s no leveling or maintenance to do.