A car battery lasts 3-5 years usually. Heavier than usual wear and tear can keep a battery from lasting that long. On the other hand, some car batteries have lasted far longer, even up to 10 years.
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The real question is, how long will your battery last? Well, that depends on a lot of factors, especially these three:
How hot does it get where you live?
What kind of car are you driving?
What are your driving habits?
Even the way a battery was treated before you bought it can affect how long it lasts in your car.
If you own a car long enough, you'll buy a car battery. And it can be stressful. You're about to go to work, go home, go meet a friend, and your car battery dies. Your whole world stops until you buy a new one—and sometimes it's an expense you weren't expecting. Now, your battery purchase is an investment to avoid the stress from a dead battery again.
So, it's natural to ask: How long will your car battery last?
Saying three to five years can be misleading.
Is that three years since it was manufactured or three years after it was installed? On top of that, two years is an awfully wide range for an average. Why can’t it be just four?
Jeff Barron, Interstate Batteries auto electronics expert, doesn’t like to put a number to a car battery’s average lifespan.
As the Interstate lab manager and battery expert to car professionals, Barron measures battery life every day. In his experience, battery life can vary wildly if you change just one variable.
Visit any place where Interstate is sold and ask for a fast, accurate battery test.
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The car, the climate, the driver, even where you bought the battery — it all makes a major difference in how long you can expect your car battery to last. In fact, it could be “dead” before it’s installed in your car, or it could last 10 years or longer.
So how long do car batteries last on average?
Well, it depends on your circumstances.
If you face some brutally hot summers, leaving your car in the sun all day long isn’t good — for a lot of reasons. The car battery is one of them.
Car batteries are most efficient at 80 F. Plenty of them die in winter, but brutal summers leave permanent damage on a battery. That damage builds up. Eventually, the battery can’t hold enough power to start a car, no matter how much you recharge it.
Now, an Arizonian who keeps their car in a garage may get more years out of their battery than a Wisconsinite who leaves their car in the summer heat.
Keep your car battery in the shade to help it last longer.
Power-hungry Mom vans like the Honda Odyssey and daily commuters like the Toyota Camry go through batteries at different rates.
Modern driving means keyless entry, Bluetooth connections and precise gas-saving engines calculating transmission changes and fuel usage — and all that technology needs power. The alternator gives electricity while you’re driving, but the car battery runs things when you’re not.
As a matter of fact, your car is never truly off. The engine may not be running, but the onboard computer is. The power control module (PCM) and a dozen memory-storage modules throughout the vehicle need to draw power. This is called key-off drain or parasitic drain. It may be one or two amps, but the battery needs to recharge from it.
The alternator does recharge the battery, but it’s also busy powering everything else. Even if you’re hitting highway speeds, the onboard DVD player, Bluetooth sound system, USB charging ports and everything else is drawing amperage away from what the alternator would put to recharging the car battery.
Go easy with your devices, and your battery will go farther.
Yes, the way you drive can absolutely affect your car battery. Change a few habits, and you might not have to change your battery as often.
Taking only short, five-minute drives can wear your car battery down.
You can jump start your car all on your own with the Interstate jump starter, a handheld battery pack you hook up to start your car anytime it dies.
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Every time you start the engine, you pull a big dose of power from the battery in an instant. Then the alternator is supposed to recharge the battery. However, if you park after driving for just a few minutes, the alternator barely had time to refill the electricity you used. Remember, you need time to recharge batteries.
You also need speed: The engine needs to be running at 1,000 rpm for the alternator to start charging the battery at all. To refresh the battery a little, you need 10-20 minutes of highway speeds or a couple hours to recharge it significantly.
Recharging the battery regularly helps it last longer.
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Any battery on the shelf older than six months might start your car but it won’t last as long under the hood. Just like milk, fruit or an open bottle of soda, car batteries will go bad by losing charge if they’re left on the shelf for too long. Car batteries on the shelf lose about 5% of their charge every month, and they get permanent damage if they ever drop to 75%.
Batteries need electricity. From the day they’re made, car batteries start to degrade — until they get recharged. Boosting a battery turns back the clock, giving you a longer battery lifespan overall.
If you’re asking about a battery that was kept fresh, it’ll last longer.
Three or four weeks of not driving could kill your car battery. Less than that if your car has a lot of onboard technology, including keyless entry or remote starting. Even less if your battery is already weak.
Your car is always drawing a small amount of power from the battery. Its onboard computers stay on to store engine data. Its antennas listen for commands from the key fob. Its security system stays vigilant.
If you’re driving every other day, that small drain is harmless.
If you leave your car for a week or two, it’s not a small drain anymore.
If your battery was already weak and you don’t drive the car for a month, you're almost certainly going to need to jump your car.
Pick up the smart charger that guards your car battery’s life, the Interstate Guardian. Pick the 1.2-amp model to maintain a battery you’re not using or the 4-amp charger to refill it to 100%.
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Less than six months might be the limit that a car battery can last on a shelf and still start your car. Even if batteries were left on the shelf for just five months, they could already be dead.
In a single month, a car battery could lose 5% of its charge sitting on a shelf. If it loses 75% or more, the battery’s chemistry starts to corrode in a process called sulfation. Essentially, a battery goes bad if it’s not recharged regularly — and the battery will go bad faster if it’s sitting in hot weather.
A new or 6-month-old battery might start your car on a warm day, but it also might have degraded so far that it couldn’t pass a battery test. That means it’s fragile. It’ll start the engine when it’s easy. But if temperatures drop, if the battery doesn’t get regular recharging, if the battery gets shaken enough, it’ll die. A fresh, healthy car battery can handle some vibrations, a cold winter and going without a recharge for even a week.
A fragile one will buckle if it’s put to the test.
Car batteries can last much, much longer than three to five years. In fact, Interstate’s battery guru Jeff Barron said he hears “quite often” about car batteries lasting 10 years or longer. When a car battery lasts 10 years, it means it never took any significant, permanent damage from either sitting in high temperatures or sitting for a long time with a low charge.
There are two keys to long battery life:
This is no guarantee, but if you park in a garage and hook up a trickle charger every so often, you may get longer-than-average life from your battery. Then again, you may do everything right — and the car battery you bought might have sat on the shelf too long for it to last beyond the average.
You can drop the guesswork and get a car battery test. Auto techs can run a sophisticated test in less than a minute to give you an accurate reading on your car battery’s health. Depending on the battery tester your technician uses, you can even find out how cold it has to be to kill your car battery.
Visit any place Interstate is sold, and let the pros give you a fast, accurate battery test.
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We were approached at the SEMA Show by an Ultra4 racer, who ran two of our batteries in his buggy at King of the Hammers and he indicated he was having trouble with them. His rig wasn't diesel-powered, so why is this relevant to diesel truck owners and how long their batteries last? Because both applications involve vehicles that use multiple batteries. In this case, two OPTIMA D34/78 YELLOWTOP batteries. The Ultra4 racer indicated the two batteries were a "matched set" that he bought at the same time, but as the photo above shows, that is clearly not the case, at least with the labels.
Upon closer inspection, one battery had a build date of August 2, 2008, while the other battery had a build date of August 8, 2018. While the two batteries were identical in the type of battery (SPIRALCELL AGM) and size of battery (D34/78 YELLOWTOPs), they couldn't be much further apart on age. Whenever someone has a vehicle, whether it is an Ultra4 or diesel truck, that runs two or more batteries, the batteries in that application need to be identical in the type, size and especially the AGE of the battery. Why is age so important?
As batteries age, their ability to accept and deliver current changes. Internal resistance slowly increases and capacity slowly decreases. As a result, an older battery may not charge up at the same rate as a newer battery that is identical in every other way and it may not deliver current at the same rate. In essence, you are running two different batteries. Doing that can shorten the lifespan of both batteries, as one battery may be constantly overcharged, while the other battery is constantly undercharged, regardless of whether they are wired together in series or parallel. The same thing can happen if you run a flooded battery (higher internal resistance) with an AGM battery (lower internal resistance) or a physically larger battery (more reserve capacity) with a smaller battery (less reserve capacity).
So if you have a diesel truck that runs two or three batteries and one needs to be replaced, every other battery in that application needs to be replaced as well. That doesn't mean you need to recycle the other battery if it still works, but you may need to move it to another vehicle or application, that only uses one battery. But does that answer the question of how long a diesel truck battery should last?
While it helps explain how to maximize battery performance and lifespan, it doesn't provide a definitive answer, because one single answer doesn't exist. Some batteries could last a few months in extreme applications, while others could last 20 years or more. Batteries used in extreme temperatures (both hot & cold) don't last as long as batteries used in more moderate climates. Batteries that have their voltage properly-maintained tend to last longer than batteries that are often discharged and left sitting in that state for extended periods of time. Batteries that routinely see very shallow discharge cycles will have more cycle life, than batteries that routinely see deep discharge cycles.
The result is the question of how long a diesel truck battery should last really turns into an answer of how much are you willing to do to maximize the performance and lifespan of your diesel truck battery? The first step is starting with batteries that are identical in age, size and type. OPTIMA Batteries can last up to three times as long as a traditional flooded lead-acid battery in the same application, so that's a good start too, but AGM batteries in general should last longer than their flooded counterparts. Protect your battery from extreme temperatures, both hot & cold and make sure your battery (or batteries) are big enough for your application. Finally, keep your batteries fully-charged to at least 12.6 volts (at least 13.0 volts for our YELLOWTOP batteries ) whenever possible to maximize the performance and lifespan of your batteries.
If you think one or more of your batteries might need replacing, fully-charge them and have them load-tested (most battery professionals offer this service for free and you can find one near you here). One thing to remember, if you are running D31T YELLOWTOP batteries or any other batteries with threaded terminals, those threaded posts are used to secure the cable connection to the base of the battery, not to transmit current. Watch this video to see how to properly load test a battery with threaded terminals:
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