As an added bonus, the RedTop is completely sealed and will therefore not leak acid when tilted or inverted. When combined with the claimed purity of the lead (99.99% according to Optima), this allows the RedTop to dramatically outperform similarly-sized batteries when it comes to starting amps and discharge rate. This layout allows more of the lead surface to remain in contact with the battery acid. Unlike traditional batteries that rely on flat lead plates submerged in an acid bath, the RedTop utilizes spirally-wound plates separated by a fiberglass mat encased in each cylinder-shaped housing. If you've browsed the battery section in an auto parts store any time within the past couple of decades, you've almost certainly seen Optima's distinctively designed batteries sharing shelf space with dozens of regular black boxes. *If your car requires an AGM battery, check out the MTX series for the correct replacement battery. Costco may have a different warranty policy, however - be sure to check before you buy. Need any more reassurance that Interstate batteries are a popular go-to choice? Costco has discontinued their Kirkland Signature battery line and has opted to carry Interstate batteries in their place. As of May 1, 2019, the warranty period for all MTP-series batteries is 30 months free replacement, followed by a prorated amount of 45% between months 31-48, 25% between months 49-60, and 10% between months 61 and 72. Cold cranking amp performance varies depending on the size, but Interstate batteries generally carry a higher CCA rating than many OE batteries. It's offered in over two dozen of the most common battery sizes, and are commonly found at auto repair shops and tire dealers. standard, non-AGM) battery that the company offers. The MTP series is, as Interstate claims, the best flooded (i.e. The best car batteries combine strong, reliable starting performance with a long warranty just in case anything goes wrong, and Interstate understands this down to a science.
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