How often does one need to change car batteries?

It really depends more on the battery than the size of the car. Most batteries will definitely let you know if you need to change them but if yours is two years old you might clean it up and look at the original label it should indicate how long you might expect it to last by warranty information or term like "three year battery." If it is giving you any trouble starting or has had to be jumped or recharged more than once recently I would change it.

Battery health really has very little to do with expiry dates or scheduled replacement. The best preventative maintenance, in my opinion, would be to find a parts house with a good battery tester. A good battery tester electronically checks the overall condition of the cells. Depending on how the car is operated, and how good the charging system is, a battery can last for 5-7 years, maybe longer. I'd get a test done before winter hits, perhaps as part of a winter prep.

About 4 yrs is the life of any battery. Batterys go bad all at once, one time you start the car just fine and the next time it won't make a sound. This usually happens when there is a change in the weather, usually when the weather goes from hot to cool, that is when baterys seem to go bad! And if Mr. Beans Mini failed to start he would probably tie a rope to someone else's car and try to get going that way!

It's the heat that kills them, but it's the cold that buries 'em.

Hot climates to more damage to batteries. It is not uncommon for people in the south to replace batteries in 2-3 years. In northern climates the same battery in the same car might last 5-7 years or even longer. That includes northern climates where the summer temperatures can get into the high 90's.

Batteries temporarily lose their capacity in cold weather. That is why people have trouble getting their cars started when it is VERY cold out.

Car battery should last 5-6 years, but it depends on a lot of factors. As long as it works there's no need to replace it.

That is like asking how often you have to change a light bulb. As often as it fails. If your battery is two years old, holding a charge and starting the vehicle, it's fine. If you turn the key and it cranks slowly, or just clicks, you might need to change the battery, assuming the alternator hasn't failed.

a batteries life depends on a few things like the climate you live in, accessories you're running in your car, and how often you drive it to keep it charging. So I would say don't change it until it dies.

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A Batteries worst enemy is very cold climates... depending on the use and condition of your battery you should be able to expect approx. 4 years of life out of it....Clean Cable connections are important to the life of your battery as they will allow it to be charged properly....

depending on the qualty of the battery, weather conditions, and other stuff, 5 to 7 years is the average.