So, it is crucial to check the Ratings right before you buy, rather than count on data from a year or two ago. We do see significant variation in how models perform year to year, reflecting production changes.
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If you're shopping for a battery, the best bet is to check your owner's manual for the size you need, and refer to our ratings for one that suits your needs and budget-regardless of brand. All other AGM batteries in this test scored much better in the life test.ĪGM batteries also typically cost more than conventional designs, and only one other battery in our Ratings carries a higher price than the $180 we paid for the DieHard Advanced Gold 50748. Our test samples of the DieHard Advanced Gold 50748 were the only AGM batteries that did not to survive on average 13 weeks or more of the life test, and they would not have lasted even through the old 10-week test. 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.
Offers end 12/31/21.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. Visit your my GM Partner Perks dashboard or see for complete details, eligible parts, and rebate form, which must be postmarked or submitted online by 1/15/22. My GM Partner Perks members that have accepted the terms and conditions receive streamlined, automatic rebate redemptions. Visa Prepaid Card will be issued in the business name. Laboratory-tested, field-proven, and backed by GM with outstanding limited-warranty coverage, ACDelco Gold (Professional) and Silver (Advantage) Batteries set the standard for performance. Allow 6 to 8 weeks from promotion end date for delivery of Visa ® Prepaid Card. Whether the application is automotive, industrial, marine, or recreational, we have a battery to meet virtually any need. Government and municipal fleets are excluded. †Mail-in rebate available only to Independent Service Centers, Body Shops, or Commercial Fleets with a U.S. See or for details and rebate form, which must be postmarked or submitted online by 1/31/22. Allow 6 to 8 weeks for delivery of Visa ® Prepaid Card. †Mail-in rebate available to retail customers with a U.S.
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