you say to get the most cycles out of the centennial deep cycle battery the water level needs to be maintained up to the vent wall. the battery is maintenance free and it states never add water again. Please explain.

Hello, Our Centennial Flooded Lead Acid Deep Cycle Maintenance Free batteries come sealed for life from the factory and do not require maintenance of the electrolyte levels. The most significant benefit of the sealed design is that no service attention is required, other than ensuring the battery is kept clean and fully charged.