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Chemical reactions slow down in the cold.

The electricity produced in a car battery is the result of chemical reactions between the sulfuric acid and the lead plates. Slow down those reactions and the battery is not able to produce its normal current.

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Q: Why do car batteries run down in cold weather?
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Why would a car not start in cold weather?

batteries are rated for cranking amps and cold cranking amps.. in warm or hot conditions your engine oil is also warm and not thick so your batteries do just fine.. now in cold weather conditions your engine oil is thick so your battery doesnt have the potential to crank the engine


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Can you leave CD's in car during cold weather?

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Does it matter how many cold cranking amps a car battery has?

Yes, that is how you know that the battery is "strong" enough to start your car in cold weather. A battery in warm weather may have enough amps to start the car fine, but in cold weather, it wouldn't be able to crank it fast enough. A car battery efficiency drops off the colder it gets.