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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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Related questions

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


Car battery does not hold charge in cold?

The cold weather slows down the chemical reaction that goes on inside the battery.


Can cold weather hurt mpg in a hybrid car?

Yes of course it can. The liquid fuel engine has lower mpg when starting cold. And everyone knows electric batteries don't work so well in the cold. --------- No it cannot hurt a hybrid car's mpg.


Why does the car stall when cold?

There are a few reasons why a car might stall when cold. The car might just be stiff from the cold weather.


Do you need to warm your car?

if you are in cold weather you do.


How does the weather effect car batteries?

The colder the temperature , the less cranking power the battery has


Why do car batteries die faster in the winter?

I believe it is because the cold wears them out faster.


What does antifreeze do for your car?

It stops your car from freezing and not starting up in cold weather


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

Yes but only if you leave the window down..you don't want the poor things to suffocate


Can gas in a car freeze in very cold weather?

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Cold Cranking: Choosing the Right Cold Weather Car Battery.?

In cold weather climates, the lower temperature reduces the overall viscosity of engine oil. The increased thickness leads to increased resistance when it comes to turning the engine over during the initial start-up process, which in turn more quickly drains the battery. In order to maintain consistency during cold weather operation, car owners should select a batter with a high cold cranking amps rating, which represents the batteries ability to maintain a specific energy output for a consistent period of time at 0 F.


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.