Superior quality batteries at affordable prices. Plates constructed with envelopes separators to prevent shedding of active materials and to ensure longer lifespan. Superb protection against road vibrations/shocks - reducing premature failure. Extra long lasting due to slower self-discharge rate. Corrosion resistant terminal posts- improves current flow and cranking. Durable polypropylene cell container- impact resistant container to house positive and negative cells. Safety vent plugs - specially designed to eliminate acid loss and to enhance O2 & H2 gases recombination in the cell.