Garden tractor, snowmobile, and utility battery provides maintenance-free calcium grids to eliminate the need to add water. Benefits of the flush manifold vented cover include elimination of the danger of harmful acid spills and lost vent caps, and no pod vents to interfere with hold-downs and cables. Envelope separators protect all sides of the plates, preventing internal shorting and providing superior cranking capacity. Tough lightweight polypropylene cases resist breakage under rough conditions. Shipped wet and unboxed (with protective sleeve). Contact East Penn for a credit on the old core if date of purchase is older than 90 days.