Fourth of all, the Sears Die Hard Platinum P4 is an Odyssey battery. Make sure that it isn't just a "Die Hard" nor a "Die Hard Gold." It must be a PLATINUM. The batteries are identical electrically and in construction. The only difference is the color of the plastic case and the label. I re-verified this fact today by calling two different departments at Enersys. You can read the announcement of this distribution deal here: News Release=
Fifth of all, OPTIMA brand batteries, that are now made exclusively off shore or over the border, have gone downhill for YEARS. Maybe the guy that used to work for them will get his tongue gouged out for spilling the beans, but I don't have any relationship with ANY battery company, so I'm not afraid to speak. Unlike Odyssey, which uses pure virgin lead, Optimas at some point reportedly began using recycled lead. I don't know if this began when JCI (Johnson Controls) took over in 2000, or when that Swedish company bought Optima back in 1994 or so.
Recycled lead doesn't hold up like virgin pure lead. But it sure costs less.
Up until at least 1993, Optima's were using pure lead, and they were the best battery available at the time. The technology spiracell used in Optima batteries was protected by patent, and that patent was owned by a subsidiary of the Gates Corporation, which invented this battery back in 1967. This same group, through a series of sales, acquisitons, and spin-offs is now part of Enersys Corporation, as the Odyessy group.
The Optima brand was sold twice, and the brand that made a solid name for itself in the '70's, and even more so in the '80s, was leveraged by each buyer to capitalize on the consumer's awareness and perception of quality, with cost cutting measures to generate more profits. The end result is what we have today... the Optima battery that still enjoys a lingering "mystique" of being "the best", while suffering the malignment of being built like the worst.
The Optima's former stellar reputation has been supplanted by stone cold reality. Optima's are NOT the best. They are a sucker's battery, riding on a tailwind of an illustrious past, and not worth the price they fetch at Sam's Club, much less the premium they charge at the speed shops.