10 Best Marine Battery Chargers – Reviews and Buying Guide

Best Marine Battery Charger

A marine battery is a very important accessory to have on a boat.

It provides you with a power source that can be used for powering a trolling motor, giving you light at night, amongst the many other things you can do with electricity on a boat.

As with all marine batteries, it will quickly get depleted when used and will need to be recharged. This is where the marine battery charger comes into action. It is a heavy-duty and highly efficient charger that can be used to recharge all common types of marine batteries like lead-acid, AGM, or even wet cell batteries.

Best, a top-rated marine battery charger remains quite affordable and easy to use. It also comes in different sizes and power outputs to suit your need.

10 Best Marine Battery Chargers – Reviews

Image

Product Name

Power

Battery Voltage

Rating

Current Price

NOCO Genius G3500 UltraSafe Smart Marine Battery Charger

1. NOCO Genius G3500 UltraSafe Smart Marine Battery Charger

3.5 A

6 V and 12 V

4.1

Minn Kota On-Board Digital Battery Charger

2. Minn Kota On-Board Digital Battery Charger

5 A, 6 A, 10 A

Variable

4.6

ProMariner 43021 ProSport 20+ Marine Battery Charger

3. ProMariner 43021 ProSport 20+ Marine Battery Charger

20 A

12 V, 24 V, 36 V

4.5

Schumacher SSC-1000A SpeedCharge Battery Charger

4. Schumacher SSC-1000A SpeedCharge Battery Charger

2A, 6A, 10A

12 V

4.2

NOCO Genius GENM2 Smart On-Board Battery Charger

5. NOCO Genius GENM2 Smart On-Board Battery Charger

8 A

12 V

4.1

Minn Kota Precision On-Board Battery Charger

6. Minn Kota Precision On-Board Battery Charger

6 A, 10 A, 15 A

12 V

4.8

Marinco ChargePro On-Board Battery Charger

7. Marinco ChargePro On-Board Battery Charger

10 A

12 V

4.2

Minn Kota MK-105P Portable Battery Charger

8. Minn Kota MK-105P Portable Battery Charger

5 A

12 V

4.1

ProMariner 43012 Marine Battery Charger

9. ProMariner 43012 Marine Battery Charger

12 A

12 V and 24 V

4.4

ProMariner ProSport 6 Marine Battery Charger

10. ProMariner ProSport 6 Marine Battery Charger

6 A

12 V

4.5

1. NOCO Genius G3500 UltraSafe Smart Marine Battery Charger 

Affordable and value for money

Editor's Rating: 4.1 out of 5 stars (4.1 / 5)

NOCO Genius G3500 UltraSafe Smart Marine Battery Charger
  • Power: 3.5 A
  • Battery Voltage: 6 V and 12 V

The NOCO Genius is the most affordable model that you will find in this marine battery charger review. But despite its small price, it still does not sacrifice functionality and offers you an excellent set of features.

Among which, is its versatile battery voltage capability of 6 V and 12 V. You will have no problem charging most batteries on the market with this battery charger.

Also, you can purchase this model in different sizes to suit your battery charging needs. But what we like the most about this model is that it is able to charge almost any type of batteries on the market, ranging from gel batteries up to deep cycle batteries like AGM.

This current model has a 3.5 A power, and despite being not the most powerful charger that you can buy, it still gets the job done and will be able to deliver good charging time and good performance.

Lastly, the entire Marine battery charger is sealed and protected from the outside in such a way that humidity and water will not be able to penetrate it and damage its electrical components. This makes it durable and long-lasting. When it comes to the charging process itself, this charger uses a clamp system that you can very easily connect to your battery terminals.

Pros:

  • The most affordable battery charger in this review
  • Flexible. Comes in a wide range of power to suit your need
  • Can charger most 6 V and 12 V batteries on the market
  • Protected from the outside with a thick plastic shell

Cons:

  • Very weak power of 3.5 A
  • The connector clamps do not sit on the battery terminals tightly

2. Minn Kota On-Board Digital Battery Charger

Heavy-duty 4 bank digital charger

Editor's Rating: 4.6 out of 5 stars (4.6 / 5)

Minn Kota On-Board Digital Battery Charger
  • Power: 5 A, 6 A, 10 A
  • Battery Voltage: Variable

If you require a professional and a heavy-duty marine charger, then it is difficult to beat this Minn Kota digital battery charger. It has 4 banks that will allow you to charge no less than 4 batteries in parallel. This will be highly beneficial to you especially if you have a lot of batteries to charge at the same time.

Moreover, the voltage inside this battery charger is variable so it will be able to charge any type of battery voltage out there. But one of the best features of this model definitely remains its digital functionality. Indeed, this digital battery charger constantly monitors the charge in the battery and deliver the appropriate amperage so as to charge the battery in the most efficient manner possible.

In addition, the build construction is heavy-duty and will last you a very long time even if you use it quite regularly.

This model is quite heavy when compared to others, but it is not designed to be a portable Marion battery charger. Instead, it comes with a base that will allow you to screw it to any location you want. As a fixed battery charger, this model by Minn Kota works perfectly and remains one of the best onboard marine battery chargers that you can buy.

Pros:

  • 4 banks allow you to charge for batteries at the same time
  • Digital charger charges your bathroom very efficiently
  • Flexible. You can choose the power of this charger during the purchase

Cons:

  • Quite heavy. Not portable
  • The charger may heat up when all 4 banks are in use

3. ProMariner 43021 ProSport 20+ Marine Battery Charger

Powerful 20 A charger with ring connectors

Editor's Rating: 4.5 out of 5 stars (4.5 / 5)

ProMariner 43021 ProSport 20+ Marine Battery Charger
  • Power: 20 A
  • Battery Voltage: 12 V, 24 V, 36 V

Few models can beat the ProMariner in terms of power and efficiency. Indeed, this model has an impressive power of 20 A which will allow it to charge any type of deep cycle battery whether it is AGM, lead acid, or gel in record time.

Moreover, one of the most distinctive features of this battery charger remains its versatile battery voltage of 12 V, 24 V and 36 V. As we can see, it is compatible with the most common types of voltages used in Marine batteries. The only caveat is that it does not charge 6 V batteries, but those are rarely used in boats.

You also have a lot of flexibility as you are able to purchase this marine charger in different sizes and styles depending on your need and purpose. Since this is an onboard charger, it comes with a base that allows you to quickly and easily fix it to any location you want.

In addition, since this model uses an efficient electrical design, it will not overheat during charging. Best, you can charge 3 batteries at the same time with this charger because it has 3 banks. For your protection and safety, it comes with overvoltage protection and auto-off which means that the battery charger will automatically switch off when the battery has been fully recharged.

Pros:

  • Very powerful with 20 A. Charges the battery in less time
  • Allows you to charge 3 batteries at the same time
  • Flexible battery voltages of 12 V, 24 V, and 36 V
  • Comes with many security features

Cons:

  • Difficult to get a warranty on this charger

4. Schumacher SSC-1000A SpeedCharge Battery Charger

Efficient and portable digital charger

Editor's Rating: 4.2 out of 5 stars (4.2 / 5)

Schumacher SSC-1000A SpeedCharge Battery Charger
  • Power: 2 A, 6 A, 10 A
  • Battery Voltage: 12 V

If you want your marine battery charger to be portable and not produce a lot of heat when charging, then the Schumacher SSC-1000A is one of the best portable marine battery chargers on the market. It is fairly lightweight and comes with a handle on top that will allow you to easily carry it anywhere.

But what we like about this portable battery charger is that it is very efficient and will not overheat. But mostly what makes it so efficient is the way it charges a battery. It uses a digital charging system that constantly monitors your battery power so as to ensure that it delivers the most efficient charging power to it. For example, if you are using a small battery, then this charger will deliver only 2 A so as to ensure a smooth charging process.

On the other hand, if you are using a heavy-duty and deep cycle battery like an AGM battery, then it will automatically deliver up to 10 A of power so that it can charge the battery in the most efficient manner possible. However, due to the relatively weak maximum power of this battery charger, it is not recommended to be used with a high-capacity battery because it will take a lot of time to recharge.

You also have a very handy and easy to read digital meter right at the front of this charger that will give you all information about the charging process of your battery.

Pros:

  • Portable. Comes with a carry handle at the top
  • Digital meter at the front shows you the status of your charging process
  • Automatic variable power depending on the size and type of the battery
  • Heavy duty battery clips that will not corrode

Cons:

  • Charger sometimes misreads the battery charge and turns off
  • Lacks power when charging high-capacity batteries

5. NOCO Genius GENM2 Smart On-Board Battery Charger

Affordable and comes with Rapid Charging Technology

Editor's Rating: 4.1 out of 5 stars (4.1 / 5)

NOCO Genius GENM2 Smart On-Board Battery Charger
  • Power: 8 A
  • Battery Voltage: 12 V

Many boat owners rates this NOCO Genius as one of the best marine battery chargers on the market. There are many reasons for this. For one, this model is extremely flexible and comes in a wide range of styles and sizes. The most powerful NOCO Genius model is a 4 bank 40 A unit that is one of the most powerful we have seen. The most common one remains the 8 A GENM2 model that delivers a battery voltage of 12 V.

What distinguishes this marine battery charger from the rest is that it uses a special rapid charging technology. What this technology does is charge your battery 2 times faster than a conventional battery charger while still not overheating.

This charger also has a special electronic inside that will allow it to charge any type of battery on the market, whether it is Wet, Gel, AGM or lead acid. It can handle it all!

Best, for your security, it comes with features like short circuit protection, auto power off and anti-reverse polarity that will not blue of your battery if you do not connect the terminals correctly.

Pros:

  • Relatively affordable
  • Safe and around sufficiently
  • Rapid Charging Technology allows it to charger battery 2 times more efficiently
  • Flexible. Comes in a wide range of styles and power ratings

Cons:

  • Lacks support by the manufacturer
  • May cause damage to some wet cell batteries

6. Minn Kota Precision On-Board Battery Charger

Compact and flexible banks

Editor's Rating: 4.8 out of 5 stars (4.8 / 5)

Minn Kota Precision On-Board Battery Charger
  • Power: 6 A, 10 A, 15 A
  • Battery Voltage: 12 V

If you own a trolling motor on your boot, then you know how demanding and taxing it is on your battery. Therefore, you need a heavy-duty battery charger that will be able to charge your battery quickly, easily, and efficiently so as to prolong its lifespan. This is where models like this Minn Kota onboard battery plays a key role.

Indeed, this model has electronic circuitry that will automatically charge your battery in the most efficient manner possible. If you connect it to a small battery, it will send a small power charge of 6 A only. However, if you use a more heavy-duty and larger deep cycle battery like an AGM battery, it will send a powerful 15 A power for the recharge.

Best, this battery charger is quite compact and does not take a lot of space. But what we like the most about this model is that it is available in different sizes to suit your need. You can go with a model that has only one bank for one battery, or another that contains 4 banks that will allow you to charge no less than 4 batteries at the same time. Of course, there are LED lights that will show you the status of your charging process at all times.

All in all, this battery charger is one of the best trolling motor marine battery chargers that you can buy because of its high efficiency, high performance, and flexibility in banks.

Pros:

  • Small and compact
  • Available in different banks
  • Efficient design. Charges your battery-based on its size and type
  • Clear Indicator lights for the charging process

Cons:

  • The price could have been a little bit more competitive

7. Marinco ChargePro On-Board Battery Charger

Easy to use and easy to mount

Editor's Rating: 4.2 out of 5 stars (4.2 / 5)

Marinco ChargePro On-Board Battery Charger
  • Power: 10 A
  • Battery Voltage: 12 V

The Marinco is a minimalist Marine battery charger that does not consume a lot of space when installed. Indeed, it is quite small but yet delivers an impressive 10 A of power that will allow it to charge any type of battery on the market quickly and easily.

It comes with simple indicator lights right of the front of the unit, that shows you whether the battery is charging or has already charged. When it has already charged, this indicator light will light up in green.

Furthermore, it has a universal input of 120 or 230 V which means that it can be used anywhere worldwide one no problem. If you don’t like complicated charging devices and want a simple and yet effective marine battery charger, then this model by Marinco is definitely one of the best marine battery chargers for the money. We highly recommend it!

Pros:

  • Easy to install by beginners
  • Excellent size to performance ratio
  • Available in different sizes to suit your need
  • Automatically and accurately calculates the charge power for your battery

Cons:

  • Simple indicator lights
  • Not heavy-duty despite its high power of 10 A

8. Minn Kota MK-105P Portable Battery Charger

King of portable marine battery chargers

Editor's Rating: 4.1 out of 5 stars (4.1 / 5)

Minn Kota MK-105P Portable Battery Charger
  • Power: 5 A
  • Battery Voltage: 12 V

The Minn Kota MK-105P is a marine battery charger that concentrates more on portability rather than performance or power. Indeed, it can deliver only a power of 5 A which is definitely not the best we have seen especially when used on a deep cycle and heavy-duty battery like a big AGM battery. It will take a lot of time to recharge.

However, if you require a small and highly portable battery charger that can quickly and easily be deployed almost anywhere, then this is the model to get! It has a large and comfortable top handle that allows you to easily carry it.

In addition, the base is well ventilated so that this battery charger remains cool even when used for an extended period of time. The terminal connectors are not the best quality we have seen, but they get the job done and should be able to easily connect to the battery terminal of almost any type of battery, whether it is big or small.

And when it comes to ease-of-use, no problem there, as well as this model, is very easy to use. Simply place the connectors on your battery terminals and switch it on and it will start charging your battery. That’s it! This model definitely deserves the title of the best portable marine battery charger.

Pros:

  • Lightweight and highly portable
  • Large and comfortable carry handle at the top
  • The 2-stage smart battery charging process

Cons:

  • Low power of 5 A. Will take a lot of time to charge a big battery
  • Build construction is mostly plastic not very durable

9. ProMariner 43012 Marine Battery Charger

Extremely efficient and runs cool

Editor's Rating: 4.4 out of 5 stars (4.4 / 5)

ProMariner 43012 Marine Battery Charger
  • Power: 12 A
  • Battery Voltage: 12 V and 24 V

This ProMariner model is a popular Marine battery charger that is known for its excellent durability. Indeed, this unit is protected on the outside by a hard-plastic shell that will prevent water from getting in. Moreover, the internal components are high-quality and will last a long time as well.

But what really makes this model unique is that it uses Distributed-On-Demand technology which is a patented technology that allows it to use 100% of all the power it has to charge the battery. It does so without damaging the battery, even if this model is a 12 A battery which is quite high.

Indeed, because of its high power and special technology, this ProMariner model is also one of the best deep cycle marine battery charger on the market because it does excellently when charging a high-capacity deep cycle battery.

In addition, it has a versatile battery voltage of 12 V and 24 V so it will be able to charge most commonly available marine batteries on the market.

Last but not least, you have the option to choose between different styles and power to suit your need and purpose. Note that the average charge time of this battery charger is around 8 hours to 10 hours which is very decent.

Pros:

  • High power of 12 A allows it to charge a battery quite rapidly
  • Very efficient and uses Distributed-On-Demand technology
  • The versatile battery voltage of 12 V and 24 V

Cons:

  • The price could have been a little bit more competitive
  • Not recommended as a heavy-duty battery charger

10. ProMariner ProSport 6 Marine Battery Charger

Affordable and Intelligently charges your battery

Editor's Rating: 4.5 out of 5 stars (4.5 / 5)

ProMariner ProSport 6 Marine Battery Charger
  • Power: 6 A
  • Battery Voltage: 12 V

The ProMariner ProSport is one of the better ProMariner models. Not only is this unit more efficient, but it has a more advanced technology inside that allows it to charge your battery in such a way that also helps prolong its lifespan.

This battery charger can be used with any type of battery on the market, and it has an intelligent LED light system that will show you the type of battery you have connected to this charger, along with the status of the charging process. Moreover, the design is compact and rugged so you can install it anywhere and it will not take a lot of space.

But one of the best aspects of this model remains its very affordable price. In fact, this ProMariner model is one of the best marine battery chargers that you will find in this review, at least when it comes to price.

Pros:

  • Very affordable. Value for money
  • Small and compact. Can easily be installed anywhere
  • Informative LED light system at the front

Cons:

  • Due to its power of 6 A, it is not recommended for high-capacity deep cycle AGM batteries

How to Buy the Best Marine Battery Chargers

How to Buy the Best Marine Battery Charger

#1. On-board vs. Portable Battery Charger

Marine battery charges come as either onboard or portable.

Portable Marine battery charges are meant for small boats that occasionally require a recharge. It is lower powered and smaller which makes it lighter as well.

On the other hand, an onboard battery charger is bigger and deliver more power. This type of battery charger is ideal for those who own a big boat all who need to recharge multiple batteries at the same time.

#2. Type of Batteries

There are several types of marine batteries. Before purchasing your marine battery charger, you need to ensure that it is compatible with the type of battery you own.

Wet: Wet batteries are also known as flooded batteries. They come into types, the serviceable white battery, and the maintenance-free wet battery. In both cases, the use of water-electrolyte is very easy and cheap to replace.

Moreover, there are many wet marine batteries that come with a hydrometer that will show you if you need a recharge or not.

AGM: Absorbent Glass Mat or AGM is a new type battery that uses sheets of fiberglass stacked one next to another so as to increase electrical conductivity and reliability.

This type of battery is more efficient by others by up to 30% and is also able to deliver more amperage by up to 40%. Most deep cycle marine battery chargers will have no problem charging an AGM battery.

Gel: Gel batteries use sand inside so as to turn the battery acid into a thick and viscous liquid that has the consistency of “gel.” Just like AGM, the gel battery is a deep cycle and a heavy-duty battery.

However, it is significantly more fragile than other types of batteries and is less heavy-duty, but the price is usually more affordable.

#3. Charger Size and Number of Banks

The charger size of the marine battery charger usually dictates how “heavy-duty” and how fast it can charge a battery.

Choosing a larger size marine charger will almost guarantee that you are able to charger battery faster than a smaller and more portable charger.

However, the main caveat of a large marine battery charger is that it consumes more space and is usually heavier.

Therefore, if you have to frequently carry your battery charger around then, you probably want to go with a smaller and more portable charger rather than a bigger one, while sacrificing charging time.

In addition, the number of banks in a marine battery charger will show you how many batteries the charger can charge at the same time. For example, a Marine battery charger that has 4 banks can simultaneously charge for batteries without sacrificing power or charging time.

Of course, the more banks you find in a battery charger than the more expensive the unit will be as well.

You will have to choose between the number of banks that you need and your budget in this instance.

#4. Charging time

There are dozens of factors that affect the charging time of a marine battery charger.

However, a model that can deliver a high amperage will usually charge a battery faster than a model that can deliver a low power.

In addition, you need to consider the size of the battery that you will be charging as well. If you are charging a high-capacity battery, then it will definitely take more time than a smaller capacity battery.

#5. Durability and Safety

You need to ensure that your marine battery charger has a good build construction and is built in such a way that it will prevent water or humidity from entering the charger and causing damage. Most of the time, a hard-plastic shell will be sufficient to provide protection to the battery charger.

In addition, your marine battery charger needs to be safe as well. Look for functions like “auto power off” that will automatically switch off the charger when the battery has been fully recharged.

Also, your battery charger needs to be equipped with overvoltage protection that will significantly reduce the risk of damage to both your charger and battery.

#6. Additional features

Recovery Time: recovery time is simply how fast your battery is able to fully recharge once it has been totally drained. In most cases, a high-capacity and high-power charger will have a shorter recovery time because it can charger battery faster.

Voltage: Marine battery charges come as either 110 V and 220 V. You need to ensure that your battery charger has the right voltage for use in your country.

Connectors: You also need to take into account the size of the charger clips or O-ring connectors and ensure that it is compatible with the size of your battery terminals

Conclusion

If you consume electricity and use a battery on your boat, then you need the marine battery charger. It will recharge your battery efficiently, easily, and quickly. Moreover, it is built with components that will not rust when it comes in contact with humidity or water, so it is durable and long-lasting.

Best, the marine battery charger is extremely easy to use, and all you need to do is connect the battery connectors to your battery terminals. It’s that easy!

In fact, most models listed in our marine battery charger review above have a light indicator that will tell you when the battery needs a charge or is fully charged. Go get one right now!

Tom Brady
 

Tom Brady is an online blogger. He loves outdoor activities such as fishing, camping. He write articles about outdoor activities for this blog to share his understanding and experience.