In a Sealed Absorbed Glass Mat (AGM) battery the electrolyte is encased at all times and may be placed in any orientation, even upside down! Sealed deep cycle batteries cost more than flooded lead-acid batteries and don’t last as many charging cycles; however, they are the preferred choice for applications requiring frequent battery handling, or where the system needs to be left unattended in a remote location. Call a solar expert today with questions or for assistance at 866-274-0642