Best 3 Bank Marine Battery Chargers – 2021 Complete Round-up

| Last Updated June 2, 2021

An exceptional marine battery and a great charger to go along with it are essential pieces of gear for any angler who fishes offshore.

There’s a lot of hit and miss when it comes to battery chargers, so to help you through your next purchase, we’ve put together a list of the best chargers that you can find today.

Read on to find out more about how to choose a charger and discover some of the best on the market. 

Comparison of the Best 3-Bank Marine Battery Chargers


Minn Kota Precision On-Board Charger

  • Includes great special features
  • Sturdy and durable construction
  • Our favorite overall pick on our list
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NOCO Genius GEN3

  • Easy to install
  • Added safety features
  • Very quick and efficient
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ProMariner 43021 ProSport 20+ Generation 3

  • Very user-friendly
  • Our favorite pick for the price
  • Conditioning stage for maintenance
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Minn Kota On-Board Digital Charger

  • Convenient digital design
  • LED displays charging progress
  • Created with high-quality materials
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Guest 2713A ChargePro On-Board Battery Charger

  • Compact and lightweight
  • Lots of built-in safety features
  • Charge settings for each bank
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What is a 3-Bank Marine Battery Charger?

A three-bank battery charger is one of the most common chargers used by anglers with a smaller boat with a trolling motor. As the name suggests, it is a battery charger that has three banks for charging multiple batteries at one time. 

Three-bank battery chargers are designed to allow each battery to charge to its full capacity at the same time. Many of these chargers have functions that help batteries recover and desulphurate, which not only maintains the batteries but can prolong their life as well.

What Makes These the Best Chargers of the Year?

With the combination of customer reviews and brand reliability, we’ve compiled a list of some of the best marine chargers of the year.

But how were they given the gold star? All of the chargers on our list have the majority of the following qualities, which make them solid overall picks. 

Made With Water in Mind

We all know that water and electronics don’t mix. For that reason, it’s fairly important to go for a charger that is water-resistant, if not fully waterproof. Because you’ll be on a boat, humidity and moisture are a real threat to your equipment. A waterproof design can eliminate some of that stress.

Speedy Charging Time

It’s no fun to wait around for your batteries to charge up, especially if you’re in a make or break situation with time. A great battery charger will have a quick and efficient charging time, keeping your focus on the fish, rather than the batteries.

Durable and Long-Lasting

An exceptional battery charger is created with high-quality materials that won’t break under pressure. It’s an added plus if they have features specific to longevity, like a built-in cooling fan to limit heat damage.

Review of the Best 3-Bank Marine Battery Chargers

We’ve put together a list of our top picks for three-bank marine battery chargers that can get the job done with ease. Check it out below! 

Best Overall:
Minn Kota Precision On-Board Charger

Minn Kota Precision Digital Chrgr MK 330 PC 3 bank x 10 amps


  • Totally sealed
  • Very durable construction
  • Battery equalization cleans and maintains your batteries
  • Customizable charging stations for different battery types
  • Voltage compensation keeps the charge consistent no matter the circumstances


  • Super-heavy
  • Battery leads are a little short
  • A little tough to change between different charging styles

What Recent Buyers Report

Boaters who purchased the Minn Kota Charger were pretty thrilled with this product’s precision charging and customizability. Among many things, buyers appreciated the very durable construction and awesome special features included, like voltage compensation and battery equalization. There were a few complaints about the weight and length of battery leads, but for the most part, the response was overwhelmingly positive.

Why it Stands Out to Us

This Minn Kota is, in our opinion, the gold standard when it comes to on-board marine chargers. Aside from a few very minor flaws, this charger provides great power and some excellent features that add to the convenience of the overall product. We love the sturdy, intentionally-constructed design and the fact that the whole system is customizable.

Who Will Use This Most

This charger would be a great fit for an angler who uses multiple styles of batteries. Something fairly unique about the Minn Kota Precision Charger is that each battery bank is customizable— the user can switch between AGM, flooded, and gel with just a couple button presses.

Bottom Line

Overall, there’s no doubt why the Minn Kota Precision Charger earned the top spot on our list. With great special features, excellent power capacity, and durable construction, this charger could make an awesome addition to your boat.

NOCO Genius GEN3

NOCO Genius GEN3, 3-Bank, 30-Amp (10-Amp Per Bank) Fully-Automatic Smart Marine Charger, 12V Onboard Battery Charger and Battery Maintainer


  • Quick charging time
  • Very user-friendly design
  • Lots of built-in safety features
  • Durable, long-lasting construction
  • Charges a versatile range of batteries


  • Bulky and awkward
  • No charging indicator lights
  • Not made to use with an extension cord

What Recent Buyers Report

The majority of buyers of the NOCO Genius Charger were satisfied with its performance both on the water and off. Several users praised its easy-to-install design and overall usability, and appreciated that it was quick to charge. However, some did wish that it included charging indicator lights to give a better idea of how much time was left when in the middle of a charge.

Why it Stands Out to Us

We’re big fans of the NOCO Genius Charger for several reasons. Firstly, we appreciated the safety features the company took the time to add. It is 100 percent waterproof, ignition protected, and also has a firewall that protects against unsafe, abnormal conditions. In addition, this is a versatile charger that can handle a wide range of batteries.

Who Will Use This Most

The NOCO Genius Charger is a great option for anglers with safety at the top of their priorities list. As mentioned above, this product has many features put in place to ensure user safety. Although this is quite a bulky charger, it is fairly lightweight, making it a good option for anglers with smaller boats.

Bottom Line

For anglers with safety on the brain, the NOCO Genius Charger is hard to beat. Although it may lack some convenient design features, this charger makesup for it in its own way. It provides a quick charging time, versatility in performance, and a durable housing.

Best for the Money:
ProMariner 43021 ProSport 20+ Generation 3

ProMariner Gen 3 ProSport 20 Amp 12/24/36 Volt 3 Bank Waterproof Marine Battery Charger 43021


  • Exceptional value
  • Easy to use and install
  • Strengthens batteries through conditioning stage
  • Charges fairly quickly
  • Compact size


  • Cables should be longer
  • No charging gauge for individual batteries
  • No internal fan

What Recent Buyers Report

Those who went for the ProSport Charger were very excited by the value of this product, considering the very low price it is offered at. Among other compliments, buyers were happy with the easy-to-use design and quick charging, though they wished the cables had a bit more length and some other convenience features were included.

Why it Stands Out to Us

This charger has a spot on our list because of its overall value and performance. Budget chargers can be few and far between and it’s even tougher to find ones that function effectively. The ProSport Charger is a great option because it has a battery strengthening stage, charges quickly, and is compact.

Who Will Use This Most

This charger is a great option for those anglers looking to get the best bang for their buck. This is our value pick because it comes at a very reasonable price point without compromising performance. In addition, the size of this charger is pretty convenient for those with smaller boats.

Bottom Line

Overall, we’re proud to include the ProSport charger on our list. Although it is missing some features included in higher-end models, this little charger is not to be overlooked. It is handy, convenient to use, and performs well when it counts.

4. Minn Kota On-Board Digital Charger

Minn Kota Johnson Outdoors MinnKota MK 330D On-Board Battery Charger (Black) (1823305)


  • Monitors battery temperatures
  • Clearly displays charging process
  • Durable, high-quality construction
  • Digital design is very convenient
  • Maintains batteries in addition to charging


  • Awkwardly tall
  • A little difficult to use
  • Mounting tabs are inconvenient for some

What Recent Buyers Report

The recent response to the Minn Kota On-Board Digital Charger has been overwhelmingly positive. Buyers were really pleased with the clear and concise nature of the digital system that clearly displays each battery’s charging process separately. Some wished it was a little more user-friendly and easier to mount, but complaints overall were minimal

Why it Stands Out to Us

As you can probably tell from our list, we’re pretty big fans of Minn Kota and the products they release. This digital charger is a great example of the excellence the company tries to pursue. This is a very high-tech charger with lots of great special features, which is why it earns a spot on our favorites list.

Who Will Use This Most

Although this is a very effective charger, it isn’t the easiest to use. Some users had some difficulty switching between settings, and for that reason, this charger might be a better fit for an angler who is a little more technologically adept.

Bottom Line

The Minn Kota Charger, although not the easiest piece of equipment to use, is highly valuable for many reasons. It is high-tech and durable, effective, and overall, a great product that can assist an array of anglers.

5. Guest 2713A ChargePro On-Board Battery Charger

Guest 2713A Guest On-Board Battery Charger 15A / 12V; 3 Bank; 120V Input


  • Conveniently-sized
  • Lightweight construction
  • Charge displays for each bank
  • Several built-in safety features
  • Advanced charging cycle for battery maintenance


  • Heats up quickly
  • A little difficult to install
  • Cord length is not adjustable

What Recent Buyers Report

Those who went for this ChargePro setup were pretty impressed by several aspects of the tool. Buyers commented on, among other things, the well-built, lightweight construction and the multitude of safety features. Some were not impressed, however, with the heat this charger produces over time.

Why it Stands Out to Us

We thought this list would benefit from the addition of a charger that was more low-profile, comparatively. In addition to its convenient size, we also appreciate the added safety features, like the in-line safety fuses. It also has a clear LED display that projects the charging status of each battery separately.

Who Will Use This Most

The ChargePro is a great size and shape for smaller boats that can’t handle the weight of a hefty charger but still need power to run their watercraft. This would be a suitable pick for anglers who want the performance without all the added bulk.

Bottom Line

Although you may have to keep an eye on this battery charger’s temperature, overall, this is still a good option for anglers, especially those who are worried about space and weight. This low-profile charger is effective and convenient.

Aspects to Consider Before Buying  

Now that you have some awesome battery chargers in mind to choose from, it may be tempting to jump right into a purchase. But before taking that step, consider some aspects that may have taken the back-burner in your mind.


Before making your purchase, you should know a couple of specifics that relate to your batteries. What amperage do you need? Determine the amp-hour rating of the batteries you’ll be using and add that together— then multiply that by 10 percent to get your amperage. You should also know the voltage of the batteries you’ll be using. The majority of marine batteries will be 12 volts, but that’s not always the case. 

Compatible With Your Batteries

This may seem self-explanatory, but it is vital to make sure that your batteries can charge functionally with your charger. Some battery styles have a tough time with certain chargers, so it is very important to make sure they match up well before purchasing.


Now you know the ins and outs to great marine battery chargers—  so what’s stopping you? Go out and make an informed purchase and you’ll be one step closer to fishing success. Good luck and happy fishing!  

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My name is Caleb and I am obsessed with hunting, fishing, and foraging. To be successful, you have to think like your prey. You have to get into the mind of your target - and understand Big Game Logic. If you have any questions, or just want chat about your latest hunting score or big catch, you can reach me at Read more about Big Game Logic.