12 volt 60Ah AGM SLA marine Battery 9.2"L*5.5"W*8.3"H heavy duty 12V AGM deep cycle battery with float service life span of 8 to 10 years. Carring handles made for easy handling. Electrolyte suspension system VMAX tanks utilize an electrolyte suspension system consisting AGM (absorbed glass mat) of a high porosity that totally absorb and contain the electrolyte. No silica gels or any other contaminants are used Military grade plates provide an extra margin of performance and service life in either float or cyclic applications, even after repeated over discharges. Maintenance free operation: There is no need to check specific gravity of the electrolyte or add water to VMAX tanks during float service life. In fact, there is no provision for this type of maintenance. VMAX MR96-60 12V 60Ah Group 22NF AGM Sealed Maintenance-Free Battery.