![]() The failures are especially noteworthy because the DieHard Advanced Gold is an AGM (absorbed glass mat) design, which typically makes for a more rugged and longer-lasting battery than a conventional battery. Two more examples purchased for retesting also failed. Two samples of the DieHard Advanced Gold 50748 in Group 48 failed this test after just six and seven weeks-not even halfway through our stringent test regimen. We extended the test from 10 to 15 weeks last year, to more accurately reflect battery life over a longer period. This simulates the taxing cycles batteries go through while subjected to high underhood temperatures. One of our evaluations, called a "life test," involves repeatedly draining and recharging batteries while they are immersed in 167-degree water-a protocol based on an industry test. Visit our car battery buying guide for buying advice and complete Ratings. (The cracks observed in our previous test caused no loss in performance, but previously resulted in a lower score.) (See which car batteries we recommend.)įor instance, a DieHard Advanced Gold battery now tops the top-terminal Group 65 category used in many large vehicles, with no evidence of the small case cracks seen in our last test. ![]() Based on our findings, it is best to cast aside brand loyalty, and instead focus on CR's test results. The greatest inconsistency comes from DieHard, which makes both the best and worst performers in two of six common sizes. But our latest Ratings make it easy to find the best one for your needs and budget, no matter what you drive.īig-name battery brands DieHard (Sears and Kmart), EverStart (Walmart), and Interstate all top our Ratings in some group sizes, but they are at or near the bottom in others. ![]() Our latest tests show that shopping for a car battery by brand name alone can be a big mistake, both in terms of performance and in cost.
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