"Special Separator Provides virtually maintenance free operation and makes the battery spill-proof. AGM technology eliminates water loss. Grid Design Withstands severe vibration, assures maximum conductivity. Active Material Compounded to withstand vibration, prolong battery life and dependability. Thru-Partition Construction Provides shorter current path with less resistance than ""over the partition"" construction – you get more cranking power when you need it. Safety Valve / Flame Arrestor Relieves excess pressure. Patented Sealed Post Prevents acid seepage, reduces corrosion – extends battery life. Heat Sealed Case to Cover Protects against seepage and corrosion – bonded unit gives extra strength. Polypropylene Cover and Container Assures reserve electrolyte capacity for cooler operating temperatures: gives greater resistance to gas and oil – and impact in extreme weather conditions."