Top 5 Best Portable Marine Chargers | 2020 Review & Buying Guide


A good portable marine battery charger can keep your boat running for longer, and recharge when your battery runs dead. Here at Portable Corner, we have done extensive research to find the best portable marine charger that you can currently get for your marine adventures.

If you are in a hurry and just want to find out what is the Best Portable Marine Battery Charger, then I recommend below As the best ones.

Last update on 2020-10-23 / Affiliate links / Images from Amazon Product Advertising API

What is the Best Charger for a Marine Battery? – 5 Factors to Consider

There are several factors to consider when choosing the best portable marine charger for your marine battery. A good portable battery charger that will charge your battery quickly, safely, and is easily portable. Here are some features to look out for when choosing your portable marine charger.

1. Type of Battery Charger

Before you make your definite pick, you absolutely need to know what type of battery your boat has. Most commonly, you will find:

  • Lead-acid batteries
  • AGM batteries
  • Gel batteries
  • Lithium-ion batteries

You’ll want to pick the battery charger that’s suitable for your battery. Most charger providers will specify what type of charger they offer, so keep an eye on this small but crucial detail.

2. Voltage.

As most marine batteries will run off a 12V system, you’ll probably wonder how many amps do I need to charge a 12-volt battery? Normally, you will need between 20-50 amps to charge the battery.

But most batteries will tell you exactly what type of battery voltages they are appropriate. A higher amperage of the charger will allow you to charge the battery faster, though. But this also depends on the size of the battery. The portable marine battery charger should be able to work with different input voltages, too.

3. Safety And Durability.

A very important factor when choosing your battery charger is that your battery charger is safe when you use it. This means that it should be waterproof.

Other built-in features that improve the safety of the charger include protection against reverse polarity, protections against current, voltage, and temperature shocks, and more. The charger must meet the ABYC/UL 1236 safety standards!

4. The Number of Charging Banks.

For those of you who have multiple batteries, having several charging banks on your portable marine charger is absolutely necessary! It will allow you to charge all of your batteries at once, which will allow you to use your boat faster.

If you have deep-cycle and starter batteries together or other types, then having multiple charging banks is the way to go.

5. Customer Support

Another thing that’s commonly neglected is the customer service the battery charger provider offers. For beginners, it might be slightly more complicated to get the grasp of things, which is why there should be flawless and quick customer support. A good warranty can also help.

How Do You Use a Portable Marine Charger?

Using a battery charger is relatively straightforward. Most marine battery chargers come with a manual, so you can always consult a manual first before using it. However, if you don’t have it at hand and if you’re looking to give your batteries some charge quickly, then follow these steps.

  1. Turn off the battery. Make sure it’s turned off – it’s the first and most important step.
  2. Then, take a look at the battery terminals. You’ll want to make sure the terminals are completely free of any residue, salt buildup, and are completely dry, too. You’ll want to do the charging somewhere dry.
  3. Next, hook up the portable marine charger to the battery. Connect the positive lead to the positive terminal, and then the negative lead to the negative terminal.
  4. Then, it’s time to turn on the charger. Most chargers will offer you several options and types of charging. Once the charger has done its work, it will let you know.

Another thing to keep in mind is to always make sure you’re using the right type of battery charger for your battery. As we’ve mentioned before, there are several types of batteries out there. Most chargers will be able to charge a variety of battery types, though.

Can You Overcharge Your Battery?

A very important thing to keep in mind is to never overcharge your battery. This can result in potential damages to your battery, including cracks, or even explosions in severe cases. This can ruin your battery, but it can also ruin your boat completely.

The best way to avoid this is to make sure you turn off the charger when it’s done charging. Most chargers will tell you when the charging is done, so that shouldn’t be too much of a problem.

On-Board Vs Portable Marine Battery Charger?

Do I need a portable or onboard marine battery charger? Well, the answer largely depends on your needs. If you have a larger boat with more powerful batteries, then an on-board charger will probably be better.

However, if you don’t have a large boat, and you have a small or medium-sized boat, then it’s better to opt for a portable marine battery charger. Why?

Because it’s easier to use and hook up, more lightweight as it won’t take up that much weight and space, plus, you can always use it for other charging means – motorcycles or other gadgets.

The 5 Best Portable Marine Battery Chargers

With everything kept in mind, let’s take a look at the 5 best portable marine battery charger options for you right now.

1. NOCO Genius GEN3 30 Amp Battery Charger

If you’re looking for a reliable marine battery charger that won’t let you down, then the NOCO Genius portable marine battery charger is a great choice. The stand-out feature is the 3-bank 30 Amp charging ports, which will allow you to charge three 12-V batteries at the same time!

In addition, it has a waterproof and completely safe design, so you can use it in almost any type of conditions out there. It has a waterproof rating of IP68, allowing you to use the battery charger even if it is submerged for 3 meters or more. Plus, it has several built-in safety options, such as spark-proof technology, reverse polarity protection, thermal, ignition, and overcharge protection.

And with the Rapid Charge technology, this portable marine battery charger will charge your batteries up to two times faster than some other chargers on the market! And the best of all is that this charger will allow you to use it for a wide variety of uses – for your tractor, boat, or other equipment that requires regular battery charging. You’ll also get a 5-year warranty.

Why This Marine Battery Charger
  • IP68 waterproof and completely safe to use.
  • Allows for versatile use.
  • 3 banks for charging, allowing you to charge three 12-V batteries together.
  • 5-year warranty included.
Keep in Mind
  • The customer support could be improved.

Check the latest price on Amazon  


2. Minn Kota On-Board Digital Charger

After going through all the products and doing the research, we have discovered that the Minn Kota portable marine battery charger is possibly the best in terms of portability and the charging power it brings. You’ll have four different options to start with: a 1-bank charger, 2-bank, 3-bank, and 4-bank charger. Each charger will have 5 amps per bank, allowing you to charge your batteries fast.

One of the best features of this charger is arguably the ease of use and the portability that comes with it. With the multi-stage charging, you’ll be able to see exactly at what stage the charging process is. Red light means leave the battery to charge, yellow means the battery is still charging, while green means the batteries are fully charged.

In addition, the product is saltwater resistant and corrosion-resistant, too. Also, you will expect your battery charger to be waterproof, which this product is. And it also features the ATC technology, allowing the charger to adjust the temperatures according to the exterior temperatures. Plus, this charger is easy to use in the long-term, even if you haven’t used it in a while.

Why this Marine Battery Charger
  • Very lightweight and portable.
  • Indicating lights will tell you how the charging is going.
  • Waterproof and safe to use.
  • 3-year warranty included.
Keep in Mind
  • Might not last for very long.

Check the latest price on Amazon  


3. ProMariner 43021 ProSport 20+ Generation 3

The ProMariner ProSport battery charger is a great, versatile portable option if you’re looking for a reliable battery charger. It has two banks for charging of total 20Amps, allowing you to charge batteries of 12V, 24V, and 36V. The great thing about this charger is that it’s lightweight and easily portable, allowing you to use it easily for any type of charging.

You’ll need to keep in mind that one bank is suited for hooking up to the trolling cell, while the other is for the cranking cell. It will take you about 3-4 hours to fully charge your batteries. However, the charger will let you know exactly at what stage the charging is in, with the light indicators on the charger itself.

Another great feature of this product is the safety measures taken to make sure you’re safe when you’re charging. This includes the rugger, aluminum case for the charger, voltage overload protection, over-temperature, overheating, reverse polarity, and ignition protection. This is a great battery charger for marine batteries that will last you for a long time.

Why this Marine Battery Charger
  • Portable and easy to use.
  • 2 banks for charging.
  • Safe to use and rugged design.
Keep in Mind
  • Not the best warranty (2-year warranty) and customer support.
  • Might not charge both batteries to 100%, so check twice.

Check the latest price on Amazon  


4. Marinco ChargePro On-Board Battery Charger

With the Marinco portable marine battery charger, you’ll be able to charge almost any type of battery – from flooded, to AGM and gel batteries, it has you covered. It will charge two batteries of your choice – 12V batteries. It is also a waterproof charger (IP68), meaning that it’s durable and won’t break down when submerged.

And you’ll be able to use this charger anywhere you go. Thanks to the universal AC input (120/230V), this product will give you plenty of movement freedom and security that you’ll be able to use it with almost any type of input.

Plus, you’ll be able to see how the charging process is going. With the indicator lights on the dashboard of the product, you’ll clearly see at what stages the charging is. Overall, a very good product for the money asked.

Why this Marine Battery Charger
  • Charges flooded and AGM batteries.
  • Universal AC input allows versatile use.
  • Safe and waterproof.
Keep in Mind
  • Might fail to work after some time.

Check the latest price on Amazon  


5. Guest 2707A ChargePro On-Board Battery Charger

With the Guest on-board battery charger, you’ll be able to charge up to two batteries at the same time. Thanks to the 8Amp 2-bank charging, you can charge two 12V batteries simultaneously. But above all, this product is very portable and lightweight, so you can use it practically anywhere.

Safety is also an important feature of the charger. It’s 100% waterproof (IP67), and it also features reverse polarity, over-current, over-voltage, over-temperature, and ignition protection. Plus, you’ll get a 2-year warranty with this product.

Charging on the go has never been easier, thanks to this charger’s portability and ease of use.

Why this Marine Battery Charger
  • Easy to use and portable.
  • Safe to use.
  • 2-year warranty.
Keep in Mind
  • Not a replacement for older guest units.

Check the latest price on Amazon  


The Bottom Line

There are many portable marine battery chargers out there, making your choice even tougher. The first thing to make sure is that the battery charger is completely compatible with the type of battery you own.

We consider the NOCO Genius GEN3 portable marine battery charger (Check it on AMAZON) to be the best overall product. Thanks to its 3-bank powerful charging, ease of use, safety, waterproof, and quality build, we believe this product has a lot to offer.

If you’re looking for a more affordable alternative, then consider the Minn Kota On-Board Digital Charger (Check it on AMAZON). You’ll be surprised just how much you can get for the money that this product will cost you.

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