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Only a handful of auto batteries deliver what their labels imply, at least when it comes to claimed cold cranking amps (CCA). We found in our more realistic tests that only a small minority of batteries met manufacturer claims, although some came close.
CCA, reserve capacity, and life tests are three measures that we use to determine the power and durability of batteries. The Ratings and Quick Picks for all group sizes, on pages 58-59, include batteries in this test as well as batteries that we previously tested. When new, every tested battery will start your vehicle and provide reserve power for when lights are mistakenly left on or the alternator fails. Some ...