Best Marine Battery Chargers (2022): Reviews & Comparison

Boats need two things to run - a motor and a battery. The battery provides power for the boat's electrical system, starting the engine, and running accessories like lights and radios. While there are many different types of batteries available on the market, marine batteries are designed to withstand the tough conditions used in watercraft. When it comes time to replace your boat's battery or charger, it's important to select the right product to ensure you're getting the most out of your boating experience. In this article, we'll take a look at some of the best marine battery chargers on the market and what sets them apart from other options. So whether you're looking for a new charger for your boat or want some information on what goes into the best marine battery chargers, we've got you covered.

NOCO Genius GEN5X2 Marine Battery Charger

The GEN5X2 is an all-in-one, 5-amp, 2 bank marine battery charger and battery maintainer that charges and maintains your batteries. The GEN5X2 is the most advanced onboard marine battery charger on the market today. Its compact design allows you to place it anywhere convenient on your boat or watercraft. The GEN5X2 is powerful enough to charge two 12 volt batteries at once while also maintaining them with a trickle charge. You can use any type of lead-acid or lithium-ion battery you want, wet cell, gel cell or AGM.

We earn a commission if you make a purchase, at no additional cost to you.
BMK 12V 5A Smart Battery Charger

The BMK 12V 5A Smart Battery Charger is a great choice for charging any batteries with 15 to 100 amp hour. It delivers rapid charge with an input of 100 to 240 volts of AC power and 5 amps of DC output current. The smart battery charger automatically stops charging once fully charged to prevent overcharging. Lightweight and perfectly portable, this battery charger is easy for you to take it anywhere. With the help of this battery charger, you can easily charge your car or truck batteries without any problem.

We earn a commission if you make a purchase, at no additional cost to you.
ADPOW Automatic Battery Charger

ADPOW's Fully Automatic Battery Charger is perfect for charging 12-volt batteries. It has a maximum supported output of 5 amps and comes with overcurrent, overloading, and short circuit protection for your safety. This charger is versatile and can be used with many different types of batteries, making it a great option for multiple applications. It also comes with a lifetime quality warranty.

We earn a commission if you make a purchase, at no additional cost to you.

Do Marine Batteries Need a Special Charger?

You may have heard that marine batteries are different than other types of batteries and require a special charger. This isn't true! Any mainstream charger will do, as long it matches your boat's power source (which can be found on its label). The advantage in using these type-specific devices is they're water-resistant, so you don’t need to worry about getting shocked when charging at home during a raining storm season - make sure not to use them near wet surfaces if possible because liquid seeping into this sort of damage mechanisms inside over time due to lack proper protection measures used while designing construction materials accordingly.

Wet cell batteries, commonly used in small watercraft, can be charged using a standard automotive-style charger. Just make sure the voltage rating on your boat's battery matches that of the charger (12 volts or 6 volts), and it should work like a charm.

How to Prolong Marine Batteries When Boating?

The easiest way to prolong the life of your marine battery is to stop discharging them so completely. Don't leave any lights on overnight while at the dock, don't keep running the bilge pump, and if you're leaving for an extended period of time without use - plugin some trickle or maintenance charger. If you're still finding yourself with completely drained batteries after boating, then try hooking up a trickle charger while the boat's in storage. Trickle chargers are designed to provide a minimal amount of charge - usually enough to keep a battery from going completely dead during storage, but not so much that it damages the cells over time. Because these devices typically aren't powerful enough to fully recharge a battery, you mustn't leave them plugged in for more than 24-48 hours at a time. Otherwise, you run the risk of pushing too much energy into your batteries, damaging their internal mechanisms and shortening their lifespan.

How Long Can Marine Batteries Be Left Discharge?

Marine batteries generally have longer life spans than their automotive counterparts, thanks to being used less frequently and more heavily constructed with thicker plates and better insulation. You can expect a marine battery to last between three and seven years, depending on your purchase type and how often you are boating in general. With that said, there's no reason not to take good care of your boat's power source to get the most out of it when it comes time for a replacement.

What Does Marine Battery Charger Do?

A marine battery charger is an electronic device that uses electricity from a generator (often referred to as shore power) or alternator to charge your batteries when they're low. Like automotive chargers, these devices provide energy gradually over time using their own circuitry instead of instantly like jumpstarters which provides them with more safety. There are several different types of marine battery chargers, each designed to work with a different power source and boat.

How Does a Trickle Battery Charger Work?

A trickle battery charger is an electronic device that provides your standard or marine starting batteries with just enough charge to keep them from going completely dead during storage. This way, you won't have to worry about draining your boat's power source when it goes in for months at a time, but still be able to use the vessel when spring rolls around. Trickle chargers can also be used on smaller ATVs or motorcycles where their main purpose is just extending their shelf life for convenience purposes between recharges.

Types of Marine Battery Chargers - Types of Chargers for Your Boat

There are four major types of marine battery chargers available:

- 1. Automatic Trickle Chargers - Most common and often used for smaller boats, trickle battery chargers automatically charge when power is available. This means you can plug your boat's battery into one of these devices before leaving it for the season and not have to worry about checking up on it.

- 2. Manual Trickle Chargers - Unlike automatic trickle chargers, manual versions require that you flip a switch or press a button before providing charging capabilities. The difference is that you'll need to unplug and place them in an accessible area while boating since an outside source is not always charging them. Not all manual trickle chargers have this capability, though, so be sure what you're buying before making any purchases.

- 3. Smart Chargers - Often used in areas with extremely high humidity levels, smart chargers are designed to work with your battery's internal computer for quick charging jobs. These chargers automatically stop providing power whenever your battery cannot damage anything.

- 4. Manual Desulfator Charger - If you don't use your boat often and find that its batteries aren't holding their charge like they once did, then it might be time to invest in a manual desulfator charger instead. This marine battery charger provides an initial minimal charge when plugged in but slowly discharges the cells. This is designed to help break down sulfate deposits and provide a more effective charge when boating again.

How to Use Marine Battery Chargers?

Now that you know what type of marine battery chargers there are and for what purpose they're used, it's time to learn how exactly to use them on your boat. This part is easy: find the charger, plug in your boat, and let it sit until its batteries reach capacity if auto or manual versions were purchased. It will take significantly longer for smart or desulfator models, but you'll still be able to use your vessel afterward without worrying about electrical issues safely. Like any electronic device, though, make sure not to do anything during the charging process that might damage it, like adding water or using another charger at the same time. You should also make sure your boat's motor (if it has one) is off when using any marine battery charger for safety purposes.

Marine battery chargers are a vital piece of equipment for anyone who owns a boat. It is important to select the right charger for your needs to keep your battery healthy and performing at its best. We’ve provided some tips on how to select the best marine battery charger for you, as well as a review of some of the top-rated models on the market. So, whether you are just getting into boating or an experienced captain, be sure to read our guide before making your next purchase. 

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.