That decision can be especially crucial in the coldest and hottest regions. Cold thickens engine oil and slows a battery's chemical reactions, making your battery work harder to start your car.
Heat accelerates corrosion within the battery and can evaporate the electrolyte needed for current.
Knowing the best performers will take the guesswork out of choosing a new battery, no matter where your old one fails. The tests, the results For this report, we tested 23 batteries sized for some of the most popular models on the market and among our readers. Group size 24 batteries fit many older versions of the same models. We test CCA by measuring how long a battery can provide half its rated amount until its voltage drops to 7.2 volts. CCA is most important for northern climates, however.