The Best Deep Cycle Battery Chargers for 2023

Are you on the lookout for the best deep cycle battery charger? You might be looking for the top-tier one that you can invest in for a satisfying use. However, there is a slight problem, especially for those buying this device the first time. It is why we’ve created this buying guide. In the following, we’re also writing on the things to check before buying one to ensure you’re getting what you expect from what you’re buying. Let’s find out what you need to know about a 12v deep cycle battery charger if you’re ready. But first, let’s start with the reviews of the most sought-after battery chargers by consumers worldwide.

Top-Rated Deep Cycle Battery Charger Reviews

1. Deltran Battery Tender Plus Charger And Maintainer

The Battery Tender Plus from Deltran is a fantastic device to charge and maintain the optimum operation of any battery. It has an excellent price and excellent charging and maintenance technologies to extend the lifespan of your battery.

The BT Plus battery chargers only carry a 1.25-amp charge rating. However, it charges a lot faster than some 5-amp chargers on the market. Do not expect it to be as quick as a 10-amp unit, though. This gadget has a straightforward box design that houses its battery charging and maintenance technologies.

There are two LED lights on the front panel that allows for fast determination of the state of charging. Unfortunately, we did not find any graduated light indicators that should be useful in giving you a more accurate determination of the current charge state.

This Deltran battery tender has several protections to safeguard your batteries. These protective mechanisms also keep the charger at its optimum operating efficiency. What we appreciate about the BT Plus is its automatic restart. The device automatically restarts itself the moment power gets restored after a power interruption.

2. NOCO Genius10 Smart Charger, Maintainer, And Desulfator

The Genius10 is one of NOCO’s most reliable deep cycle battery chargers. This gadget comes in a very compact package that belies its awesome power and battery-saving performance. Where most battery chargers fail, the Genius10 can resurrect even batteries with near-zero voltage.

It is not surprising that some people compare it to the Optima battery charger. The Genius10 can restore near-dead batteries by detecting a voltage that is even lower than 1 volt. Most systems on the market can only ‘restore’ batteries that have a minimum of 3 volts. It underscores the Genius10’s advanced sensors to help bring back your almost-dead battery to life.

Two of the most important modes of the Genius10 are the supply mode and the repair mode. The latter is perfect for restoring damaged batteries to near-perfect conditions. The supply setting is ideal for maintaining the integrity of batteries. You will get the best performance from your battery, regardless of its state and type. And speaking of battery typology, this is another aspect that the Genius10 has an advantage over other brands. It works with lithium-ion batteries and not only lead-acid types.

3. Schumacher SC1281 6/12V Fully Automatic Battery Charger

The Schumacher SC1281 is one of the most stylish battery chargers you could ever get. The company ditched the typical brick form of conventional chargers for something more contemporary. With an integrated handle to make carrying a breeze, the SC1281 is a joy to use on your car’s battery or that of your solar system.

The Schumacher deep cycle battery charger has a unique “connect-and-forget” design that conjures images of modern plug-and-play devices. You connect the SC1281 to your battery and power it up. The rest is up to the ingenious technology running the Schumacher. It automatically detects the type of battery that you have, including its capacity. It has several protections. These work to improve the durability of both the charger and your battery.

One of the most helpful things about the SC1281 battery chargers is their user interface. There is no missing the charge level of your battery. The digital display is large enough to be seen from several yards away. The pushbuttons are crisp, and they provide exceptional feedback. We are also amazed at the built-in diagnostic features of the SC1281. It can run tests to determine the status of both your car’s battery and alternator.

4. TowerTop Smart Battery Charger/Maintainer

The Tower Top smart battery charger and maintainer is your all in one solution when it comes to charging all 12V lead-acid batteries, standard GEL, and AGM batteries. You will like how systemized its method is following its 7-step charging process and maintenance modes allowing you to maximize the full charge and optimize your battery without the risk of overheating.

This smart and fast charger is your perfect choice for re-energizing your automotive, marine, lawn and garden, RVs, and power sports equipment. You will find its digital LCD extremely helpful and informative because it will allow you to have an overview of its charging status, the charging current, battery type, voltage, and any error information. Since it makes use of icons, it is visually friendly and easy to understand.

Considered a universal charger, this one also provides a layer of protection to your battery because it has its integrated safety technology that will protect you from short circuits, overcharging, and overvoltage. It is also a spark-free system with a reverse polarity defense. It is a safe addition to your entire household. It only not gives you that protection, but it will also let you maintain and prolong the battery life of your batteries so you can use it more.

Another thing that you will like from the Tower Top is its smart cooling fan that you can control. Also, with its ergonomic design, transporting it is very convenient and hassle-free. The flexible design makes carrying it so much easier. You can easily take it from the house to your car and to anywhere else with ease.

5. Ampeak Smart Battery Charger/Maintainer

Ampeak has been established for the last 24 years when it comes to the automotive business, and one of its objectives is to develop products of the highest standards. The brand’s smart battery charger with winter mode is another example of their commitment to ensuring that they provide a product that functions and delivers.

One of the main advantages of having this battery charger is its high voltage reconditioning functionality. It can stimulate batteries that have gone bad due to a low-softening plate or short circuit. It follows a working cycle of 5 cycles, with each cycle lasting for 4 hours. If the charger test determines that the battery is still under 12V after the patch-up cycle, then it will be safe to conclude that it is already a dead battery.

Adopting the ever-improving technology, this smart charger also has an integrated MCU controlled program. It has smart microprocessor displays that are connected to the battery’s voltage level. With an equally smart LCD, you will know the ongoing charging rate, type of battery, and any errors encountered within it. There is no more worrying about overcharging, over-voltage, overheat, reverse polarity, and short circuits. It displays it in word and icons, so it is very beneficial for the visuals.

One selling point of this charger is its winter charging mode. It has a unique design for charging batteries during the winter season that promotes perfect charging and longer battery life. During regular days, it follows a 6-step charging process to ensure maximum performance and output. It also has a dependable cooling system to help break up the heat.

Durable and easy to carry around, it is made of ABS material, which is an excellent choice for insulation. It will surely withstand any possible falls too. What’s more, you can conveniently store the power cable and the alligator clips within the battery case.

6. Mroinge 6V/12V 1A Fully Automatic Trickle Battery Charger

This Mroinge device is a low-amperage 12V and 6V deep cycle battery charger that guarantees safer and more purposeful charging of deep-cycle power cells. As such, the product can increase battery life and empower families to enjoy their lives.

Some might think one amp is inadequate to charge their deep cycle batteries as quickly as possible. However, there is wisdom in slow-charging batteries, especially those with lead acid. Fast-charging lead-acid units might increase their internal temperatures and pressures, reducing the power cells’ longevity or leading to failure.

Like many smart battery chargers, this product delivers a steady and safe amperage to power bricks in four steps. The initial phase assesses battery charge and integrity before applying the power required for bulk charging. Its intelligent battery charging module then pushes the much-needed current to the deep cycle battery before the maintenance stage kicks in.

I like this deep-cycle battery charger’s compatibility with different power cell types. It can accommodate a 6-volt or 12-volt lead-acid battery. Unfortunately, it’s not suitable for LiFePO4 units.

Still, this charger for AGM deep cycle batteries is safer than my current charger, thanks to its MCU-controlled program. Overcharging and overheating my battery is the least of my concern. I also never fret about injuries stemming from reverse polarity, sparks, and short circuits.

I commend this deep-cycle battery charger’s plug-and-play design. With a less complicated setup and operation, even a novice will have no issues charging their batteries.

7. BMK 12V 5A Smart Battery Charger And Maintainer

BMK BlueMickey offers you a smart battery charger that can outclass other smart systems on the market at a very affordable price. This is a gadget that can stand up to the elements, without ever losing its fundamental ability to charge and maintain batteries.

This battery charger is intelligent enough to keep you from damaging your batteries. It has strong protections against overcurrent, overcharging, and over-discharging. The system also offers protection against over-voltage, overheating, and short-circuiting. This is a robust device that automatically switches its safety features when you plug it and start charging your battery.

Speaking of batteries, the only power storage and delivery solutions it cannot charge are lithium-ion batteries. Any type of lead-acid battery should be able to draw power using the BMK. To optimize the charging and battery maintaining capabilities of the BMK, it is important to charge only batteries with a minimum capacity of 15Ah.

We love the 4-stage charging process of the BMK. It allows for a more stable and safer charging of batteries. The four charge level indicators also help in giving you a heads-up on the status of load of your battery.

8. DieHard 71219 2 Smart Battery Charger And 2A Maintainer

The DieHard 71219 Battery Charger-Maintainer is a no-nonsense device that delivers optimum power to any battery. Its brick design may not appeal to people who want a more contemporary device. One should never judge a charger based on its looks because the DieHard can be more efficient in charging and maintaining batteries than more elegant and more expensive chargers.

The 71219 works without requiring any significant input from you. You connect it to your battery and plug the DieHard to an electrical outlet. You will see the three indicator lights turn on for about 2 seconds as the system prepares for charging. The yellow LED light turns on to indicate charging. Once you see the green LED light, your battery is already charged.

Charging and maintaining your battery occurs in 5 different stages. This is another plus of the DieHard. Given its low price, it would be understandable if it only had a 4-stage charging process. We also appreciate a quick-connect system that allows users to charge batteries that may be more difficult to reach.

9. Schumacher SP1296

Looking for a “connect and forget” automatic battery charger? Then your search is over with the Schumacher battery charger and maintainer. One Schumacher battery charger review claims that this is the ultimate automatic battery maintaining charger, and we couldn’t agree more.

With no buttons or even switches, this is the ideal battery charger for boats to lawnmowers and motorcycles. You have the option to use if to charge and maintain the batteries or just to keep it. As it is very much compatible with different battery types, you can energize your standard, AGM batteries, and GEL batteries. It is also a 6 volt deep cycle battery charger.

It is built with an integrated microprocessor controller. It has a multi-stage charging system that promotes safety, precision, and longer battery life. It can also provide you with a security layer, knowing that it can automatically detect 6V batteries from 12V batteries. You can also benefit from its reverse hook-up protection because it will help protect your battery and charger from damage.

You will also find it’s quick-connect harness complete with three connectors to be beneficial. Included in the package are quick to connect battery clamps, a 12V accessory plug, and a ring terminal connector. You can easily connect it even to hard to reach batteries with these connectors making it very convenient and easy.

As reviewed, this is the ultimate connect it and forget it all season charger since it maintains and keeps track of the battery when it is ultimately charged. It will resume the continuous charging when the battery loses some of its charge. Also, the Schumacher is guaranteed to have met the highest industry standards for energy efficiency. It is what they call the exclusive Schu Eco Energy principle.
User friendly and very simple, should you encounter some bump using this, there are a lot of helpful and available Schumacher battery charger troubleshooting guides that you can follow at home.

10. ADPOW 5A 12V Automatic Smart Battery Charger Maintainer

A smart charger for deep cycle batteries should not cost a fortune. ADPOW proves this by delivering its version of an intelligent battery charger. The ADPOW charger comes with enough advanced features to put other pricey gadgets to shame. Its performance is never an issue either.

What amazed us about the ADPOW unit is its 7-stages of battery charging. Most smart chargers today only feature four stages. ADPOW ups the game by adding three more. This ensures a more stable and more efficient means of charging different types of batteries. From SLAs to AGMs and flooded types of batteries, the ADPOW can provide your power solutions with the energy they need to run various applications. This makes the ADPOW a reliable 12V car battery charger. It does not work on 6-volt or 24-volt systems, however.

We also like the multiple protections on these battery chargers integrated into the ADPOW’s design. The company did this without compromising the charger’s compact and lightweight form. Charging your batteries should be as easy as using a laptop charger.

The charge indicators of the ADPOW battery chargers are simple LED lights. They provide an easy-to-use interface that eliminates the guesswork.

11. NOCO Genius G3500 Battery Charger And Maintainer

Perfect for all vehicle owners, the NOCO Genius G3500 is a must-have. With a promise of 2x the charging time, you can charge fully your fully drained batteries and get a few more years out of them.

The NOCO Genius G3500 can charge a wide variety of battery cells. It can work with Starter and deep cycle 12V and 6V lead-acid cells like COLD/AGM mode and even 12V Lithium cells. Surely, you have one like this stashed in your home or trunk, so give it a try and find old batteries to be even useful ones.

You can leave this battery charger all year round without the fear of overheating or overcharging. This one is considered as one of the most advanced and safest chargers of today because it has incorporated a spark-proof technology with reverse polarity protection. You would also enjoy knowing that you don’t need to worry about open circuits and short circuits, all thanks to its in-built diagnostic tool.

With optimization and energy-saving advantage, you would have that advantage knowing that this charger stabilizes the internal cell chemistry so performance can be increased and battery life prolonged. It also ensures that it minimizes the consumption of energy when you don’t require full power. It will also make the necessary alterations based on the organic battery reaction.

You will soon enough discover that resurrecting batteries don’t require miracles but just the NOCO Genius G3500. It is simple to use and very user friendly with soft button pads for control and charging changes. You will find out how many batteries you have at home that just needs a little encouragement and pulsing from this battery charger to come back to life.

12. Clore Automotive PL2320 Battery Charger/Maintainer

The ProLogixPL2320 is the future of secure and quality charging. It is the ideal charger that can go head to head with a professional technician. It is smart, safe, beneficial, and extremely versatile as it can charge several battery types. It is an all-around charger because, aside from the actual charging, it can also do battery repair, preservation, and storage charging.

It doesn’t matter if you have AGM batteries, deep cycle, gel cell, marine batteries, spiral wounds, or conventional ones because this top-tier RV battery charger is compatible with most batteries. It follows the same principle of keeping in shape through exercise, so it has what is called an exercising mode. What happens here is after your battery ultimately gets 100% charged, it transitions to a maintenance phase to ensure that it will be in the best condition possible. At this phase, a pull is taken from the cell and then recharged again. This system is what makes ProLogix ideal for long term battery sustaining.

You will also greatly benefit from the advanced technology integrated into it. It features a Soft Start Mode, which is triggered when the charge is connected to a highly-discharged battery. This mode slowly triggers the battery during the initial charging minutes and eventually rises to a more normal voltage. It gives the battery a healthy shock. Another mode that you’d find to be thoughtfully incorporated is the Battery Recondition Mode. This meanwhile gets activated if the ProLogix detects any kind of battery sulfation. Once this happens, the LED of the charger will start flashing.

Super user friendly and easy to use, this charger pretty much operates automatically. The only intervention required from you is setting the battery type, the voltage, and the charge rate. The charger will identify your battery’s need and will always aim to supply an optimal charge.

13. NOCO Genius GEN1 10 Amp Battery Charger

NOCO makes some of the most efficient, high-performance battery chargers on the planet. Take the brand’s Genius GEN1, for example. This battery charger marine is a very compact device that can deliver power to your deep cycle battery and maintain its tiptop shape.

This NOCO battery charger comes equipped with the latest innovations in battery charging and tending. Its 10A rating allows it to charge your deep cycle battery up to two times faster than other marine battery charging systems. The GEN1’s ingenious design allows it to manage your battery a lot more efficiently than other battery maintainers.

The charger delivers a high-voltage pulse when it senses that your battery has low voltage, has lost its capacity, or has developed sulfation. A commendable feature of the GEN1 is its feedback mechanism. It charges your battery at a constant rate without going beyond the capacity of your battery.

The GEN1 works with different types of lead-acid deep cycle batteries, including AGM, Gel, and flooded. The safety features are also worthy of note. It can protect your system from sparks, overcharging, thermal effects, accidental ignition, and reverse polarity effects. The construction is excellent and comes with unique water submersion capability.

What Is A Deep Cycle Battery Charger And Who This Is For

Like an AGM battery charger, a deep cycle battery charger is used to charge deep cycle batteries. This lead battery is designed to provide long-term sustained power and is ideal for applications that require more than just a quick start. These batteries are commonly used for marine applications, recreational vehicles, materials handling, golf carts, and renewable energy off-grid.

Sometimes when your deep cycle battery drops below the voltage, it needs to have to run your boat, golf cart, or electronics. You’ll need a special charger to get your battery back up to its regular voltage. A deep cycle battery charger work by charging the battery, optimizing the charging rate, and stopping when the battery is full.

Keeping your battery charged makes sure your battery both will have a long service life and prevents premature failure. These batteries run reliably until 80 percent or more are discharged, at which point recharging is necessary. While deep cycle batteries can discharge up to 80 percent, most manufacturers do not recommend discharging below 45 percent to extend the battery life.

There are things to consider to ensure that you buy the right charger for your deep cycle batteries, such as how long it takes to charge your battery. You need to consider your deep cycle battery’s correct voltage and set the charger accordingly. A good battery deep cycle charger will help prevent a battery failure.

How Does It Work

The first step in maintaining battery health is to choose the right kind of deep cycle battery charger. Smart Chargers, such as a Ctek battery charger, are compatible with the different types of deep cycle batteries like flooded, gel and AGM, and can even detect the required charge based on the voltage of the battery.

Many 12v chargers are with reverse pulse to reduce the impedance when recharging your battery, as well as to decrease the temperature. If you do not use a smart charger, know the proper voltage for a deep cycle battery and adjust the charger for it.

The charge rate for AGM batteries is 14.7V. Remember to be careful not to overcharge your battery because this can damage its internal structure and reduce efficiency.

It is the responsibility of the deep cycle battery charger to charge the battery, optimize the charging rate, and stop when the battery has reached full charging.

The charge current for a flooded lead-acid battery should be at least 10 percent of the amp-hour rating, or up to 30 percent for an AGM lead-acid battery.

Smart chargers work with most batteries and use the battery voltage to check the type of your battery and charging required. Look for a charger that comes with reverse pulse technology because when charging, this can help reduce battery temperature.

The charging time is based on amp-hours in its stores. To calculate, divide your battery’s amp-hour rating by the charger’s amp-hour rating. You will have an estimate of the time to reach full charging.

It is essential to avoid overcharging that can lead to the corrosion of the grid and shorten battery life. The excessive heat this creates can also cause buckling of the plates inside the cells and shed their active material.

What Are The Different Types Of Deep Cycle Battery Chargers

Just as there are different types of deep cycle batteries available, there are also different types of deep cycle battery chargers available in the market. They differ on several factors like type, charging rate, amps, size, and the like.

With an array of options available, you can choose a unit that can suit your needs and preferences. This section will list all the types found and seen in the market.

Charger 

The first type is the charger and is considered as one of the most basic and common types you can find. These types can fit universally so you wouldn’t have to worry about matching it with different amps, kind and the like.

Charger types work by restoring and reviving the power in your battery. In fact, they can even do this even if your deep cycle battery is completely drained.

Restorer 

A restorer is a slightly more sophisticated type of charger as it also comes with a somewhat cleaning function. Having too many contaminants and gunk in your battery’s cells affects its receiving capacity. As such, it might not charge as quickly as well as other similar problems.

The restorer corrects this as it breaks down these built-up contaminants. As such, they are recommended for professional applications or in specialty shops since these areas have several deep cycle batteries. On the downside, restorers can also be a bit expensive.

Maintainer 

Maintainers are designed to preserve and maintain the deep cycle battery’s charge. As such, the battery will refrain from completing all its charge in one go. This helps extend your battery’s life as it will only dispense small amounts of energy.

Aside from these common types, there are also deep cycle battery chargers that work well with specific deep cycle batteries. For example, a multi-stage charger is most suitable when you have an AGM deep cycle battery. Float- or fast-charging chargers are also ideal if you have gel battery types.

Deep cycle battery chargers also differ in terms of size. How big or small your battery charger should depend on several factors such as the charge rates, the battery’s chemistry, and the like.

A good rule of thumb to remember is that more amps quicken the charging rate. However, you should still consider the battery’s voltage, the power source, the battery type, and other factors to pick out a unit that’s suitable for you.

Advantages And Disadvantages Of Using A Deep Cycle Battery Charger

Like all products, deep cycle battery chargers provide several pros and cons. Knowing all of these is essential as it can help you in the decision-making process. With this, you will know if the product can suit and meet your needs and preferences.

This section will list down all the advantages and disadvantages a battery charger might bring.

Avoid battery replacements 

Replacing old batteries can be quite a time-consuming and challenging process. For one, you’ll need to uninstall the battery, which can be difficult in specific applications. You might even need to contact a professional to do it for you.

However, having a battery charger around will eliminate some of that hassle. With this, you can just recharge the battery whenever it runs of charge.

Saves Money 

Aside from requiring manual labor, swapping out old batteries can also be quite expensive. After uninstalling it, you will need to go to a shop to have a professional mechanic charge the battery for you.

However, with a deep cycle battery charger, you won’t need to do this and just charge your deep cycle battery at home.

Extends battery life 

Deep cycle battery chargers also help extend life as well as protect the battery.

While standard chargers are good, not all of them are quite compatible with charging deep cycle batteries. If you one of these, you might just end up damaging your deep cycle battery.

A deep cycle battery charger is with thicker and stronger plates that can adequately support your deep cycle battery. Just using one of these can automatically give a better performance than the standard charger types.

Moreover, deep cycle battery chargers feature a special kind of technology that charges your battery and protects it from overcharging and overheating. With this, your deep cycle battery will last longer and be safer from damages.

Easy to Maintain 

Deep cycle battery chargers are also easy to maintain. Once you’re done using them, you can just store them in a cool, dry place until the next use. You also only need to wipe them down occasionally to keep out dirt and other contaminants from building up.

Disadvantages 

Expensive 

Depending on the type of charger, deep cycle battery chargers can be quite expensive. Your common type is okay for all-around or everyday applications. However, costs will soon pile up depending on the type of deep cycle battery, the charging rate, size, amps, and other similar factors.

How We Picked And Tested

Deep cycle battery chargers are recommended if you own or are planning to purchase a deep cycle battery. While there may be some batteries that can use the standard chargers, this is not true in all cases. Moreover, there is the risk of damaging your battery without meaning too.

Hence, to be safer, it’s most trusted to purchase a deep cycle battery since these are designed to charge your deep cycle batteries ideally.

However, numerous types in the market might make it challenging to choose. But you don’t have to worry. This guide will list down all the factors that you need to consider when you are in the market.

Battery Size 

The size of your battery will dictate how much power you’ll need to charge it up again. When choosing a charger, look into how many amperage hours it will store and adjust accordingly.

Battery Type 

A deep cycle battery charger also hinges on the type of battery you have. Remember, deep cycle batteries are fragile, and thus, you’ll need to be careful when choosing a charger for them. Otherwise, you’ll just end up with problems like damaging your deep cycle battery and the like.

If you want, there are some universal battery chargers available in the market. It is ideal since you can maintain and charge numerous batteries without the added costs.

However, if you want, you can just buy a specialized battery charger. Just make sure always to be careful when charging.

Equalizer 

Many users also recommend purchasing a deep cycle battery charger with an equalizer feature. It is useful since it balances everything in your battery’s charge state and reverses any harmful effects on your plates. With this, your battery will work and live longer and be further protected.

Charge Status Tracking 

Another nifty feature to look out for is the charge status tracking feature. With this, you can easily monitor and check the status of your battery.

Having one these will know when your battery’s about to be full or when it’s about to be completely drained of charge.

Durability 

Of course, nobody wants a fragile and damage-prone product. To avoid this, look for a deep cycle battery charger that is made of high-quality materials, and that is weather-resistant.

With this, your charger can withstand various environmental factors and conditions without any problems. In fact, with this, you can even bring it along in outdoor activities and the like.

One way to confirm the battery charger’s durability is by researching about the product yourself. It’s best to go to your local store and check the product out. However, if you don’t have the time to do so, you can also make it up by reading different product reviews and buying guides.

Easy to Use 

It’s also best to look for a battery charger that is easy to use and hook up on your deep cycle batteries. Most chargers just allow you to clamp it on the battery and plug it on your outlet. However, some types require you to tweak with specific settings beforehand.

Frequently Asked Questions

Can I charge a deep cycle battery with a trickle charger?

Everything depends on how frequently you use your deep-cycle battery.

For example, RVers and boat owners who rarely go on an adventure might want to consider a deep cycle battery trickle charger. It is worth noting that a trickle charger delivers a steady, low amperage to the power cell, topping off its charge.

Despite a low discharge rate, a deep cycle battery still loses its charge over time. It might have insufficient stored energy for your needs when you finally go out for an adventure. Hence, trickle charging the deep cycle battery when not in use is sound advice. Note that the waiting time would be quite long.

On the other hand, if you use your boat or RV almost daily, it will be better to charge the deep cycle battery with a portable deep cycle battery charger than a trickle charger. These devices deliver electricity to your power bricks over several hours, often in stages.

For instance, a 3 stage battery charger quickly charges the deep cycle battery up to a predetermined level within only a few hours. It then reduces the electrical flow to fully charge the battery before the charger maintains the deep cycle battery at its pre-set level.

How long it may take to charge a 12V deep cycle battery?

There’s no definitive answer to how long a 12 volt deep cycle battery charger will charge a 12V battery. Everything depends on the deep cycle battery’s capacity, depth of discharge, type, and environmental temperature. The charger’s characteristics can also impact charging time.

For example, suppose you have a 12V 200-Ah AGM deep cycle battery at a 50% depth of discharge. A 10-amp charger should take about 10 hours to charge this battery.

On the other hand, a 200-Ah LiFePO4 deep cycle battery with an 80% discharge level will require about the same time as an AGM unit. Although the depth of discharge is greater (80% vs. 50%), lithium power cells have a faster charging rate than other battery types, including AGM.

Can I overcharge my deep cycle battery?

Yes, it is possible to overcharge your deep cycle battery, especially if you do not use deep cell battery chargers. Overcharging can shorten the deep cycle battery’s lifespan.

Sealed lead-acid deep cycle batteries can leak, swell, or melt when overcharged. Excessive charging heats the battery’s liquid components, causing them to mix, boil, and produce steam. Unfortunately, it could lead to a catastrophic explosion for older batteries.

AGM batteries are also not immune to overcharging effects, although not as susceptible to the problems associated with lead-acid versions.

Should I charge a deep cycle battery at 2 amp or 10 amp?

Charging a deep cycle battery at two amps promotes slow and deliberate charging, which is better than fast charging. It might take a while before the power cell tops off, but it will be free from excessive heat and pressure buildup.

In short, it’s better to slow charge a deep cycle battery at 2 amp.

What is the life expectancy of a deep cycle battery?

A deep cycle battery for solar, RV and marine applications has an average life expectancy of six years. Some products might last longer or shorter than the average, depending on usage frequency, care, and maintenance. You might also want to check the deep cycle battery’s warranty to get a rough estimate of its longevity.

What are the most trusted deep cycle battery charger brands?

The most reputable brands among deep cycle battery chargers are NOCO Genius, BMK BLUEMICKEY, and Schumacher, and the others featured here. They can be great places to start when shopping around for the best deep cycle battery charger that can last and deliver an efficient service.

Do you need a special charger for a deep cycle battery?

A deep cycle battery is for a low depth of release or discharge. Most of the batteries have a discharge depth of 20 percent before it becomes useless and cannot provide power anymore. These kinds of batteries are in cars. Deep cycle batteries are different because its discharge depth is between 70 to 80 percent, and unlike charging conventional batteries, you should water the battery.

This kind of battery will allow whatever it is connected to, to have more energy consumption. Therefore, the battery can be discharged more in every charging cycle. Unlike lead-acid batteries, going that low when it comes to discharging depth would be unusable.

There are special chargers designed for deep cycle batteries, and it is essential to use them. Incorrect charging is one of the main reasons why they become defective. Smart chargers or sometimes referred to us automatic chargers are for these batteries. They are designed to charge slowly, so the battery acid evenly penetrates the plates. Rapid or standard charging will not have ample time for the battery acid to do this infiltration.

The slow charging principle is the main reason why deep cycle battery chargers are recommended. The chargers can provide amplified amperage to the battery and vary it accordingly and as the need arises. These chargers usually have an integrated monitoring system and a system where the charging happens in phases. Usually, it also has built-in protection features against overcharging, which is vital for the battery’s longevity.

Can you use a regular battery charger on a deep cycle battery?

There’s no stopping you from using a regular battery charger from charging your deep cycle batteries. However, the results may not be agreeable and might cause more damage than good. It is advisable to use a charger that is designed to charge a deep cycle battery. In this way, you can maximize your battery and energy without causing it to become defective.

Unlike regular chargers with a massive dose of power in a short time, dedicated deep cycle battery chargers work more like pulses where it gives out a smaller amount of power. However, it is in a more extended period.

That is why, unlike regular chargers, deep cycle battery chargers usually have steps and modes for charging phases. Although it might vary for every deep cycle battery charger, usually, it follows an initialization, bulk charge, absorption, and a floating stage. These phases are to assist the battery and not shock it by the sudden burst of charge.

Another note to consider is that most deep cycle battery chargers don’t just act as chargers but also maintainers where it ensures that if some charge is lost naturally, it activates and automatically replenishes it and shuts down once 100% charged.

Is it OK to fast charge a deep cycle battery?

Deep cycle batteries are top-rated charged in slow phases. Fast charging is not recommended because it increases the flow of current that is being sent to the battery so the capacity can be filled up faster. It can be damaging to deep cycle batteries.

Rule of thumb for the charging speed of deep cycle battery is slow. A regular battery charger would usually charge at two amps, and this is when it is to a slow-charge mode. If it is to its fastest charging setting, it will increase up to 10 to 15 amps. Deep cycle chargers don’t go past a charging speed of 2 amp, which makes it very ideal for this type.

Experts would always recommend not fast charging your deep cycle batteries. It will allow the acid more than enough time to infiltrate the battery plates. The suggestion is charging it for a period of 10 to 20 hours, maintaining a temperature of 70F. This stable charging puts lesser stress on the plates, so the absorption is better and more efficient.

Remember that batteries will naturally self-discharge by 1%-15% monthly when stored and not in use. When this happens, lead sulfation will start to kick in if your battery’s charge goes below 80%. Deep cycle battery chargers can be left plugged and connected to your battery for extended hours as it is efficient in the pulsing and trickle principle of charging. The batteries will charge better this way instead of jolting it with power by fast charging.

How to use & install?

Deep cycle battery chargers are usually not complicated. They are user friendly and would generally have display screens for a visual representation showcasing the ongoing charging status, the charging current, battery type, voltage, and any error information that it might encounter.

There is nothing to install when it comes to the charger. It’s technically a plug and charge system with just a few steps in between. Here are the detailed steps in charging your deep cycle batteries using the appropriate smart charger, given that the electrolytes of your battery cells are adequate, and the batteries themselves are clean.

• Set your battery charger, such as a 24v deep cycle battery charger, to a trickle or slow charge. You also must set it accordingly, depending on the volt of your cell. Select if it is for a 6V, or 24-volt battery. If you can set the voltage, you can choose it for the 20% of the amp/hour rate of what you will charge.
• Connect the charger cables to the battery’s terminal posts. Always ensure that the “positive” wires are attached to the positive terminal. They are the red-colored wire or the plus icon. Proceed with connecting the negative cable to its corresponding terminal. There would be a negative sign for the negative portion.
• Turn on your charger. Go back to it after 20 minutes because it will provide you with an accurate charge left or existing in your battery cells. You do have the option to leave it so long as your smart charger has an integrated voltage regulator.
• Turn off the charger and disconnect the cables when you are 100% fully charged. Again, for chargers with built-in voltage regulators, your charger will automatically turn off once the full charge is met.

Note that deep cycle batteries are charged best when the charge flow is slow. The slower, the better.

How to care & clean?

Proper maintenance for your deep cycle batteries and charges is essential to ensure that you can use it longer. At the same time, you get optimum performance and quality charging. Maintaining your deep cycle batteries doesn’t require too much effort so long as it becomes a routine. You don’t wait until the battery is already showing damages before you start putting in some maintenance work.

It would also be highly recommended for you to inspect the physical appearance of your batteries regularly. Check for any cracks in the battery container because this can be the outlet for moisture and other unwanted elements that are bad for the internal system.

Ensure that the top of the battery, its connectors, and terminals are dry and free from dirt. Keep an eye for any early signs of corrosion. If your deep cycle batteries are damaged, better replace it. Also, the deep cycle is not synonymous with 100% discharge. Recharge your cells already when it is with 40%-50% capacity.

As for your battery charger, always make sure that you program your charger to the correct volts so it can charge the battery correctly. As much as possible, stick to 20% and don’t go any higher.

Read the manual and ensure that if your charger doesn’t have an integrated cooling fan, you strategically place it where there is enough ventilation. Replace any cables that are frayed or damaged. When charging, monitor the temperature too. Warm is acceptable, but hot is a complete no-no.

Where to buy?

You can get these deep cycle battery chargers in automotive and electronics supply stores, home depot, Lowes, and Walmart. They are also on the websites of the manufacturers as well as online marketplaces, including eBay and Amazon.

Conclusion

Using the best deep cycle battery charger, you’re getting the most out of your spending. It is heavy-duty, easy to install, and less maintenance required. But before you could use it, you must weigh your options thoroughly. Pick the one that matters for your needs and requirements.

Get started with the buying guide featured earlier to help you understand the factors to consider when shopping around for this device. Also, check out the top picks reviews and know why they can be for you or not. Nevertheless, choosing a deep cycle battery charger can be easier if you have an idea of what you’re looking for in a charger. Hoping this guide helps you pick the right deep cycle battery charger today!

Eddie B. Robinson

Hi, I am Eddie, Cleanenergysummit’s content editor. It’s so much joy to work alongside Justin, as the idea of providing knowledge about using clean energy excites us.

I’ve been working to address any concerns or questions you may have as you transition to using solar electricity to power your home. Tune in to hear our advice and suggestions on anything clean energy. Welcome!