![]() ![]() And although it can save you money over paying a local retailer-as much as $40, Allwood says-it might not be a good idea for those who aren’t experienced in installing a car battery. For example, Duracell car batteries-one of which gets a CR Best Buy designation-are made by East Penn, a major battery manufacturer.ĬR’s experts caution against buying a battery online. Regardless of where you buy them and which brands they belong to, a majority of batteries are built by a handful of manufacturers, Allwood says. Compared with the batteries sold at dealers or by mechanics, “EverStart’s warranties are just as good, and in some cases might be a little better,” says Mark Allwood, a senior market analyst at CR who covers car batteries. For example, three EverStart batteries get a CR Best Buy designation, and they’re sold only at Walmart. This year’s results continue to show that buying a battery from a car dealership or mechanic might not be your best bet. You’ll also find information below on how to know which type of battery your car needs and tips for buying a replacement battery. The batteries are from ACDelco, Delphi, Duracell, Napa, and Odyssey. “We’ve got some less expensive batteries in our ratings that score very well.”īelow you’ll find the top-performing battery in each category we test: Group 24 and 24F, Group 35, Group 47 (H5), Group 48 (H6), Group 49 (H8), Group 51R, and Group 65. ![]() “Price doesn’t necessarily mean better performance,” Galeotafiore says. But some top-rated lead-acid batteries cost less than many of their competitors, says John Galeotafiore, who oversees testing of car batteries at Consumer Reports. They’re known for having a long service life and being able to tolerate deep discharges-when the battery has been significantly drained to 10.5 volts or below, such as when the lights are left on overnight. Many of the highest-scoring are pricey absorbed glass mat (AGM) batteries. (While batteries typically fail in cold temperatures, it’s the hot temperatures that cause the degradation.) That’s where our extreme testing can separate the batteries with promise from those that come up short. There are many factors that have an impact on battery life, with weather being one of the most significant. We also put them in a freezer to see how they’ll perform at 0º F, and we track how long they’ll last if you leave your car’s headlights on or the charging system fails. We charge and discharge the batteries thousands of times while in a 167º F water bath to simulate underhood temperatures and find out how long they’ll last. ![]()
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