10 Best Marine Battery Chargers
for June 2023

The GEN5X3 is a 3-bank, 15-amp, fully-electric marine battery charger with a built-in battery maintainer, desulfator, and temperature sensor. It has a 5-amp per bank rating, so it's capable of charging three 12-volt batteries at once, or a single battery at 10 amps. The GEN5X3 automatically monitors and charges each battery independently, so you'll get accurate charging for a range of battery sizes. The GEN5X3 also features force mode, which allows you to manually begin a charging cycle on any battery with 1-volt or less of charge. The GEN5X3 is permanently sealed and waterproof, so it's suitable for use in boats, RVs, marine vessels, or any vehicle with a 12-volt battery. The GEN5X3 also has an integrated thermal sensor, which regulates the charge to compensate for cold- and hot-weather conditions. It's also compatible with all lead-acid and lithium-ion batteries. The GEN5X3 is well designed, and fairly compact, although it's a bit on the heavy side. It's a heavy, bulky charger, so it's best used on a boat or RV rather than a vehicle. The GEN5X3 is more expensive than the GENM3, but it's more powerful and more durable, so it's well worth the extra money.

With its impressive array of features, the ProSport HD 20 Amp Triple Bank Waterproof Marine Battery Charger (Part Number 44021) is the best value you can buy. The ProSport HD is an excellent replacement for the aging ProSport 20 plus (part number 43021), and should you ever need to replace it, the ProSport HD is a larger, more powerful charger. The ProSport HD is also equipped with Digital Technology, which makes it about 30% more efficient than its predecessor, and it's also compatible with more battery types. The ProSport is also more user-friendly than its predecessor, with an expanded LED display that shows a 4-stage charging process, as well as individual battery status and charging type. The ProSport HD is also easier to work with, thanks to its 15 amp/20 amp charging mode, its simple integrated velcro strap, and its floating, waterproof design. The ProSport HD has all the features of a more expensive charger, but without the price tag.

The NOCO Genius GEN5X2 is one of the best marine battery chargers we've tested, thanks to its small size and ultra-fast charging. The GEN5X2 can charge two batteries at the same time, and it can also charge batteries as low as 1 volt, making it great for emergency chargers. In addition to charging batteries, the GEN5X2 also has a built-in battery desulfater and maintainer, so it can keep dead batteries from draining. It also has a built-in thermal sensor, so it adjusts its charge to the actual temperature of the batteries. The GEN5X2 can charge in different modes, including 12V, 12V AGM, 12V Lithium, and 12V Repair Mode, which makes it suitable for different types of batteries. The GEN5X2 is small enough to leave in your boat or RV, and it's durable enough to survive the roughest conditions, including lots of water, so it's perfect for keeping your batteries charged.

The ProSport 12 is a great portable battery charger, with several key advantages. Its built-in quality is top-notch, with protection against overcharging, overcurrent, and short-circuiting. The ProSport 12 also has multiple charging modes, which are helpful when you need to recharge a battery quickly, or, for example, when the battery is cold. The ProSport 12 is also easy to use, with a built-in digital display, and it has a clasp to hold the battery in place as you charge it. The ProSport 12 is also compact, so you don't need to worry about its footprint in your RV. The ProSport 12 is more expensive than our top pick, but it's well worth the extra expense.

ProMariner Gen 3 ProSport 20 Amp 12/24/36 Volt 3 Bank Waterproof Marine Battery Charger 43021 is one of the best marine battery chargers we tested. It charges three banks of batteries at speeds of up to 20 amps, meaning it can handle multiple trolling motors and house batteries with equal ease. It charges quickly, and if you're a fisherman, the fast charging times can be invaluable. The ProSport is compact and rugged, and it's also easy to use. The digital LED display clearly shows the status of each bank, and the built-in over-voltage, overload, over-temperature, reverse polarity, and ignition protection ensure the battery bank is safe to use. The ProSport also has four charging modes, so you can charge one bank at 20 amps, charge another bank at 10 amps, or charge a third bank at 5 amps. The ProSport also automatically reconditions all batteries on board once a month, so the battery is always ready for your next adventure.

The NOCO Genius GENM3 is our favorite 12-volt battery charger, and it's easy to see why. Not only does the GENM3 charge and maintain your batteries, but it also displays battery charge, temperature, and voltage readings on its bright LCD screen, which is clear and easy to read. The GENM3 is also extremely easy to use, and it features 3 individual banks, so you can charge 3 different sets of batteries at the same time. The GENM3 also lets you set different charging rates for each bank: 3 amps, 6 amps, or 12 amps. The GENM3 also features a 3 stage charging cycle, which is designed to prevent batteries from overcharging, and it even includes a built-in battery tester, so you can test any battery you connect to the GENM3. The GENM3 is also extremely rugged, and it's waterproof, so it's likely to be able to withstand just about any situation. The GENM3 is also much less expensive than the similar Genz Benz 48-amp (12-amp per bank) battery charger, and the GENM3 is lighter and more compact than the Genz Benz.

The NOCO Genius GEN2 is our new favorite marine charger. It's smaller and cheaper than the NOCO Genius GEN1, but it offers all the same great features. The Genius GEN2 has a waterproof, IP68-rated enclosure, which means it's completely waterproof and submersible down to 3 meters, making it suitable for any marine environment. The Genius GEN2 also boasts a waterproof, NEMA 6P-rated, 10-amp charging port for charging lead-acid batteries, including wet, gel, AGM, and deep-cycle batteries. Best of all, the Genius GEN2 includes a 20-amp (10 amp per bank) on-board battery charger for charging and maintaining two 12-volt batteries independently. The Genius GEN2 is powerful enough to charge and maintain two 12-volt AGM batteries in about 5 hours, and it can safely charge all types of lead-acid batteries from 25-230Ah, including wet, gel, AGM, and deep-cycle batteries. The Genius GEN2 also offers advanced safety protection, featuring spark-proof technology, plus reverse polarity, thermal, ignition, and overcharge protection. The Genius GEN2 is about the size of a smartphone, so it's relatively easy to mount or store, and it's small enough to fit in a glove compartment.

The Noco GENPRO10X4 is a reliable, powerful, and easy-to-use 12-volt battery charger that comes loaded with features. Our test unit can charge 4 batteries at once, and because it has four banks of 10-amp sockets, you can charge up to 40-amps at once. The GENPRO10X4 is slim, compact, and easy to install, and because there are no exposed wires, it's completely waterproof. The GENPRO10X4 also has a thermal sensor, which automatically compensates for fluctuations in temperature to prevent overcharging in hot climates and undercharging in cold climates. And unlike some of its competitors, the GENPRO10X4 charges all types of lead-acid and lithium-ion batteries, and it's even powerful enough to jump-start a drained battery. Although it's a bit larger than some of the other onboard battery chargers, the GENPRO10X4 is more powerful. It also has more charging capabilities than its competitors, and it's built to last. The GENPRO10X4 is also more affordable than other onboard battery chargers, and it's backed by a 2-year warranty.

We reviewed an earlier version of the ProSport 12, and we liked its simple, quick-charging technology. But the new ProSport 12 Gen 3 features an improved design, and it charges faster, even if you're charging two batteries. Because we do a lot of saltwater fishing, the ProSport 12 Gen 3's waterproof construction is a huge plus, as are its durability and reliability. The new ProSport 12 Gen 3 is also easier to install than the previous version, but it still requires a wrench and about an hour to install it. The ProSport 12 Gen 3 is also easier to install than the previous version, but it still requires a wrench and about an hour to install it. The ProSport 12 Gen 3's digital indicator lights are easier to read than the previous version's, and this unit also offers more charge profiles than the previous version. The ProSport 12 Gen 3 costs $20 more than the previous version, but it's worth the price, and it's easy to install.