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Optimum ResultsWhile you're busy going single wire, also consider switching to an Optima Spiralcell battery. The beauty of an Optima Red Top battery is its technology: a revolutionary six-cell design with incredible cranking capacity. What's more, the battery isn't vented, meaning it never leaks. Modern technology immobilizes the battery's internals, making it different than a conventional lead-acid battery. Because power demands have grown significantly during the past 40 years, you need a battery that can handle the load. If you're installing an Optima Red Top in a '65-'66 Mustang, you'll need to replace the battery tray and hold-down with a special tray and top hold-down available from California Mustang. They look like original equipment, except for its '67-and-up hold-down design.