Can You Put a Marine Battery in a Car?

Can You Put a Marine Battery in a Car

If you’re new to the world of batteries, it’s important to understand the differences between a car battery and a deep cycle battery. While they may look similar, they serve very different purposes. Likewise, if you’re wondering whether a car alternator can charge a marine battery or if deep cycle marine batteries can be used in cars, we’ve got you covered. We’ll explore the main differences between car batteries and deep cycle batteries, as well as answer some common questions about charging marine batteries with a car alternator and using deep cycle marine batteries in cars. Whether you’re a car enthusiast or a boat owner, you’ll want to read on to learn more!

Is It Ok to Use a Deep-Cycle Battery in My Car?

The tasks that ordinary automobile batteries and absorbed glass mat deep-cycle batteries are meant to accomplish differ greatly, even though both use lead acid and are based on the same electrochemical chemistry.

If you attempt to start your car with a deep-cycle battery or your caravan with a conventional car battery, you run the danger of significantly harming your equipment and being extremely risky.

It is not advised to utilize a deep-cycle battery in your car. This is because its output is significantly reduced in cold weather, generating only half as many cold cranking amps as a conventional car battery. As long as consideration is made to the lower cranking amps compared to a beginning battery of the same size, using a deep-cycle battery frequently provides no problems.

As a general guideline, the starting battery group size should be increased by around 20% to obtain the same cranking amps from a real deep-cycle battery that will also act as a starting battery. This would be the same as substituting group 24 for group 31. Since modern engines with fuel injection and electronic ignition frequently require significantly less battery power to crank and start them, raw cranking amps are now less significant than they formerly were.

Long-term low- to medium-current delivery is possible with deep-cycle batteries. Since the draw needed to start up is too great to be sustained, the AGM deep-cycle battery is not meant to be used as a cranking battery; in contrast, the automobile battery provides a surge to start your car.

Its lifespan may be limited if an AGM deep-cycle battery is regularly utilized in a cranking situation with high current consumption. These batteries can also be charged and discharged without the aid of an alternator. This could badly injure your car in the long run because you’ll constantly be draining and recharging the battery.

Can a Car Alternator Charge a Marine Battery?

Can You Put a Marine Battery in a Car, row


The purpose of the car alternator is to maintain the battery charged and give electricity to various loads while the engine is operating. For instance, the car’s alternator can charge the marine battery alongside other batteries. When talking about deep-cycle batteries, things can easily get complicated. Amps, voltage regulators, gel batteries, and numerous other terms are on the list.

People want to know how to charge themselves effectively and make the most of their batteries and boating equipment. An automobile alternator is not the optimal device for a deep-cycle battery. Deep-cycle batteries feature larger amperages and quicker discharge rates despite having the same basic chemistry as automotive batteries.

Additionally, it yields long-term outcomes. If you charge your marine battery in a car, you risk shortening its lifespan. The automobile wasn’t designed to perform like a deep-cycle marine battery. Alternators are used to charge any marine battery, including deep-cycle batteries, on your boat. If your outboard engine was created after 2000, it has an alternator designed for charging the electrical system and batteries.

It will always be overcharged. Just when you’re driving, though. It will work as intended if you intend to go a short distance and go camping for a few days. Automotive batteries are considerably different from deep-cycle in terms of design and functionality. All of those assertions are true. However, this configuration for RVs and truck campers has existed since the dawn of time.

The life expectancy will be shortened, and the recharge might not be nearly as healthy. If your deep-cycle battery doesn’t last as long as you need it to for your boating vacation, the whole purpose of having one is kind of defeated. Another choice is hybrid batteries, also referred to as dual-purpose batteries. They are great since they can be used as a starter and deep-cycle batteries.

What is the Difference Between a Car Battery and a Deep Cycle Battery?

If you’re a vehicle owner or you’ve ever shopped for a battery, you’ve probably heard the terms “car battery” and “deep cycle battery.” While both are used to power vehicles, they have notable differences.

Let’s break it down:

Car Battery Deep Cycle Battery
Designed to crank your engine and start your vehicle Designed to provide a steady stream of power over a longer period of time
Best for short bursts of high energy use Best for consistent, low-level energy use
Not designed to be fully discharged Designed to be fully discharged and recharged
Have thinner plates, making them more susceptible to damage if fully discharged Have thicker plates to handle deep discharges better

So, what does this mean for you? Well, it depends on your vehicle and intended use. If you have a standard car or truck and just need a battery for starting purposes, a car battery will do the trick. However, if you have a boat, RV, or other vehicle that requires consistent, low-level power over longer periods of time, a deep cycle battery is the way to go.

It’s important to note that some vehicles, like hybrid cars, may require both a starting battery and a deep cycle battery to function properly.

In summary, car batteries and deep cycle batteries serve different purposes and have different designs to accommodate those purposes. Knowing the difference can help you choose the right battery for your vehicle and prevent damage or malfunction.

Will a Car Alternator Charge a Marine Battery?


Can You Put a Marine Battery in a Car, blue battery


A car alternator is specifically designed to keep the battery charged while the car is running. It has a low charge rate and is not intended to fully charge a dead battery. On the other hand, a marine battery is designed to handle deep discharges and has a higher capacity than a car battery. This leads to the question, will a car alternator charge a marine battery?

The answer is yes, a car alternator can charge a marine battery, but it may take longer than charging a car battery. The reason is that a marine battery has a higher capacity and requires a higher charging rate to fully charge. Therefore, it is recommended to use a marine battery charger for faster and more efficient charging.

  • When charging a marine battery with a car alternator, it is important to use a multistage regulator to prevent overcharging and damage to the battery.
  • Additionally, it is important to check the voltage of the battery before and after charging as well as checking the water level in the battery. If the water level is low, add distilled water to the battery before charging.
  • It is also recommended to disconnect the battery from the alternator before starting the engine to prevent any damage to the alternator.
Car Alternator Marine Battery Charger
Low charging rate Higher charging rate
Not designed for deep discharges Designed for deep discharges
Can charge a marine battery, but may take longer Faster and more efficient charging

Are Deep Cycle Marine Batteries Good for Cars?

As an owner of a car or boat, powering your vehicle with a reliable battery is a top priority. But when it comes to choosing between a car battery and a deep cycle marine battery, how do you know which one is best for your vehicle? And can you use a deep cycle marine battery in your car?

First, let’s clarify the difference between a car battery and a deep cycle marine battery. Car batteries are designed to provide a burst of power to start your vehicle’s engine, while deep cycle marine batteries are built to deliver a steady supply of power over a longer duration of time, ideal for electric trolling motors, fish finders, and other marine accessories.

Now, the question remains: can a deep cycle marine battery be used in a car? While it’s technically possible to use a deep cycle marine battery in a car, it may not be the best choice. When comparing a deep cycle marine battery to a car battery, the former is usually heavier, more expensive, and requires a different type of charger. Additionally, marine batteries may not have the necessary cold cranking amps (CCA) to start a car engine in colder temperatures.

While deep cycle marine batteries may not be the best option for cars, they are certainly a great investment for boats and other marine vehicles. They are designed to withstand deep discharges and can be recharged multiple times over their lifespan, making them a reliable source of power for extended periods of time while out on the water.

  • So what should you do if you need a new battery for your car?
  • It’s recommended to stick with a traditional car battery that is specifically designed for your vehicle.
  • These batteries typically have the necessary CCA to start your engine and are generally more affordable than deep cycle marine batteries.

Can Too Big of a Battery Hurt Your Car?


Can You Put a Marine Battery in a Car, charging


When a larger battery is inserted, the currents are adjusted, which might result in spikes and surges that could damage the fuse panel or onboard computer. Although there is reduced risk, injury to the computer is still a possibility in the event of alternator failure. Most of the damage will probably be to the fuse panel.

A bigger size could not always be possible because most cars only have a little space for batteries. Its size does not always indicate a battery’s capacity or longevity. For city driving, a battery with a bigger capacity is advantageous. As a backup, the excess amp/hour capacity will be used.

Most contemporary batteries are dry-charged, allowing for immediate usage following installation. There are no negative effects, and your alternator won’t have to work harder. The group number for the specific battery size is printed on the top of the battery. This group number specifies the physical parameters of the suggested battery, including its form and the location of its battery posts.

Smaller batteries can put an extra burden on other parts of the car, which would reduce its performance. The car’s electrical system won’t be harmed by having more potential current available. Even if the starter motor might live longer and start a little bit quicker, the difference usually isn’t significant enough to be an issue.

A vehicle’s suggested battery size is always greater than what is needed. Starting problems will happen if the battery has a bad cell or another underlying problem. It is easy to check a battery for a typical defective cell. A cell typically shorts out or stops producing when a battery matures.


Alright, everyone, this is the end of our article. We have talked about marine batteries and car batteries. We tried to answer the question of whether can you put a marine battery in a car. We hope that you have learned a lot from us. We hope that after reading our article Can you put a marine battery in a car is an easy-to-answer question for you.

Leave a Comment

Your email address will not be published. Required fields are marked *