The deep cycle battery is meant to be discharged completely. Because of the unique capability, you can’t just use any battery charger. Instead, you want to find the best deep cycle battery charger to keep your batteries in optimal condition. We’ve put together these comprehensive deep cycle battery charger reviews to help you find the equipment that suits your needs.


Preview

Model

Amperage

Operating Temperature

Check Price

CTEK (56-864) MUS4.3 12 Volt Fully Automatic...

CTEK (56-864)

4.3A

-4°F to +122°F

TECMATE OptiMATE 6 Ampmatic, TM-181, 9-step...

TECMATE

OptiMATE TM-181

5A

-4°F to +140°F

Schumacher SC1281 6/12V Fully Automatic...

Schumacher SC1281

30/100A

-4°F to +144°F

LST 12V 5A Automatic Battery Charger...

LEICESTERCN LST

5A

32°F to +104°F

NOCO Genius GEN3 30 Amp 3-Bank On-Board...

NOCO Genius GEN3

30A (10A x 3 banks)

-4°F to +144°F

BatteryMINDer 128CEC1: 12 Volt-2/4/8 AMP...

BatteryMINDer 128CEC1

2/4/8A

0°F to +130°F

BMK 12V 5A Smart Battery Charger Portable...

BMK

5A

unknown

BLACK+DECKER BM3B Fully Automatic 6V/12V...

BLACK+DECKER BM3B

1.5A

32°F to +104°F

Battery Tender 5-Bank Charger: Selectable 6V...

Battery Tender 5-Bank

20A (4A at 5 banks)

14°F to +122°F

NOCO Genius G15000 12V/24V 15 Amp Pro-Series...

NOCO Genius G15000

15A

-4°F to +104°F


Deep Cycle Battery Chargers & Their Benefits

When you purchase the best battery charger for deep cycle batteries, you gain several benefits. First, you are less likely to replace the battery. By keeping it properly charged and maintained, you will need to purchase fewer batteries as a result of a failure. Secondly, you save time and avoid being without power. Finally, the best 12v deep cycle battery charger ensures that the operation is safe. Using a traditional battery charger could lead to disaster.


Choosing A High Quality Deep Cycle Battery Charger

Usage/Environmental Elements

Not all chargers are meant to be used both indoors and outdoors. If you plan to use your charger outdoors in a rainstorm, you want to ensure it can handle the weather. If you need the best 12 volt deep cycle battery charger to use on the go, it should also be portable.

Battery Charger Type

As you look for the best battery charger for deep cycle marine batteries, you will find three different types. The charger restores and revives your battery, even if it is completely drained. On the other hand, a battery restorer breaks down contaminants to build back up the cells, but this type is expensive. There are also battery maintainers that prevent discharge by ensuring the battery level is always topped off. With the maintainer, you can extend the life of your battery.

Compatibility/Battery Chemistry

The battery chemistry is one of the most essential factors to consider before choosing the best battery charger for deep cycle RV batteries. You can’t use the same charger for conventional lead acid or gel batteries that you use with the deep-cycle variety. Instead, make sure you use a charger that specifically states it is for the deep-cycle battery you purchased.

Size of Battery

The physical size of the battery is vital, but so are the number of amp-hours it can store. A full-size battery should hold up to 50 amp hours, for maximum performance.

Monitor Charge Level Capabilities

You don’t want the battery to die sooner than you plan. With the best deep cycle marine battery charger, you can monitor the status of your battery.

Durability & Versatility

The best smart charger for deep cycle batteries is designed to be durable and versatile. Look for models that are waterproof and constructed from high-quality materials for maximum longevity.

Charger Size & Power

Your battery charger needs to match the battery voltage. You can’t opt for the best charger for a 6 volt deep cycle battery if you have 12V batteries. Check this battery voltage chart to help you determine when the deep cycle battery is dead.

You also want to make sure that the battery charger will produce the amps needed to maintain or restore the juice. It’s often best to charge a battery slowly unless you need it completed rapidly. If you plan to use the battery for starting, you will want to evaluate the starting or crank assist power as well.

Safety

It can be dangerous to charge a battery, which is why you want a deep cycle battery charger with safety features. Consider choosing a model with an equalizing feature, reverse polarity alarm, clamp amps, spark-proof clamps, a battery tester, float mode, and short circuit protection. 

Other Features

In our best deep cycle battery charger reviews, you will find a variety of options, some with sophisticated technology included. Smart Technology is something you might invest in. This process ensures that the charger shuts off when the battery is fully charged. It also maintains the battery and keeps levels topped off. Of course, every additional feature will add to the price, but also increases the versatility.

Price & Warranty

We all want to purchase the best solar charger for 12v deep cycle battery for the lowest price. However, you can’t skimp on quality. By opting for a reputable smart charger from a reliable brand, you will receive better performance, thereby providing a better value. Make sure you also evaluate the warranty.


10 Best Deep Cycle Battery Chargers Reviewed

1. CTEK (56-864)

Our Top Pick!

Amperage

4.3A

Nominal Voltage

12V

Operating Temperature

-4°F to +122°F

Weight

3 lbs.

Warranty

5 year

With this deep cycle marine battery charger, you can count on automatic charging capability at a reasonable price. This CTEK unit features an eight-step charging process that maximizes the performance and battery life. It's also dust and water-resistant so that you can use it anywhere. Plus, it comes with numerous safety features, including short-circuit protection and a reverse polarity guarantee.

If you place a lot of demand on your battery, this 12v deep cycle battery charger is sure to provide the backup you need. It also includes a process that de-sulfates the batteries and restores them back to life. There is even a battery diagnostic features that tells you if the battery needs reconditioning.

Finally, you will enjoy the LED display, keeping you informed through the entire process. While the company does offer a five-year warranty, some users have complained about the lack of direction through the owner's manual. However, it's not difficult to figure out the operation of this charger. 

Pros

  • Portable
  • Reconditioning Mode
  • Fully automatic
  • Five year warranty

Cons

  • Poor owner’s manual

2. TECMATE OptiMATE TM-181

Best Deep Cycle Battery Charger For RV

Amperage

5A

Nominal Voltage

12V

Operating Temperature

-4°F to +140°F

Weight

3 lbs.

Warranty

3 year

Among our 12v deep cycle battery charger reviews, this model has many more five-star ratings than some of the others. This fully sealed charger works with AGM, gel, or standard deep-cycle batteries. You can use it on your marine batteries and your automotive or motorcycle battery as well. Simply connect the charger, and it is fully automated so that you don't even need to think about the operation. In fact, the ampmatic charge control also adjusts the current to match the size of your battery.

Even if you have a dead or sulfated battery, this charger can restore it. This model features an advanced recovery program that helps bring life to old batteries. There’s also a handy diagnostic feature that lets you know if there are any early battery problems you should be aware of.

Even with all of these added features, the company still provides a three-year warranty. Just keep in mind that it is slightly bulkier than other options, even though it is lightweight.

Pros

  • Ampmatic charge control
  • Diagnostic feature
  • Fully automated
  • Advanced recovery program

Cons

  • Bulky design

3. Schumacher SC1281

Best Charger For AGM Deep Cycle Battery

Amperage

30/100A

Nominal Voltage

12V

Operating Temperature

-4°F to +144°F

Weight

12.65 lbs.

Warranty

2 year

If you want a high-quality unit, this Schumacher deep cycle battery charger might fit the bill. It is heavier than most but offers a 30A quick boost and 100A jump start if you need to get your batteries running right now.

It also provides a battery tester to check the charge level and diagnose any electrical trouble. With the multi-stage charging and auto-voltage detection, you get the precise operation you require to maximize your deep-cycle battery’s life.

This charger also works with all standard, gel, and AGM batteries, so you can use it with other applications for a better value. Furthermore, the reverse hook-up protection guarantees that you can't operate the device when the clamps are accidentally reversed.

The company only offers a two-year warranty with this charger, but the reviews suggest that you will never need it. Overall, this charger provides plenty of value, lots of versatility, and fast-charging capability.

Pros

  • Rapid charging features
  • Diagnostic ability
  • Reverse hook-up protection
  • Easy to use

Cons

  • Heavy

4. LEICESTERCN LST

Best Trickle Charger For Deep Cycle Battery

Amperage

5A

Nominal Voltage

12V

Operating Temperature

32°F to +104°F

Weight

1.85 lbs.

Warranty

1 year

If you want a cheap deep cycle battery charger that also has good reviews, this model will make you smile. It works with a variety of 12V batteries, including gel, AMB, VRLA, and deep-cycle. This smart battery charger can be used on your watercraft, camper, lawn tractor, vehicle, and more.

It also comes with many advanced safety protections, including reverse polarity, over voltage, short circuit, over current, over discharge, over charge, overheat, overload and spark-proof capability. Because it is dust- and water-resistant, you can use it anywhere.

Even though it's one of the cheapest and lightest on the market, it still provides plenty of functions. Enjoy the seven-stage automatic charging capability with desulfation, bulk charge, and soft start operation. You can also recondition the battery as it is dying. The LED indicator keeps you completely informed throughout the process. Plus, the company provides a one-year warranty, which is generous considering the price.

Pros

  • Seven stage charging
  • Advanced safety features
  • Lightweight

Cons

  • Only one-year warranty

5. NOCO Genius GEN3

Best Battery Charger For Deep Cycle Marine Battery

Amperage

30A (10A x 3 banks)

Nominal Voltage

12V

Operating Temperature

-4°F to +144°F

Weight

16.5 lbs.

Warranty

5 year

If you are looking for something more sophisticated, you might prefer this AGM deep cycle battery charger. It can charge three batteries at once with 10 amps per bank. The company does offer this model in other formats as well, ranging from 1-bank to 3-bank units. However, this option is the most versatile, but will also cost the most. Use it for your AGM, deep-cycle, wet, and gel batteries.

The company provides plenty of safety protection, including reverse polarity, spark-proof technology, as well as overcharge, ignition, and thermal protection. Plus, the unit itself is waterproof and rugged for use anywhere. You can even submerge it in over nine feet of water without ruining it.

Because it features so many certifications, you can count on the performance. Furthermore, the company offers a lengthy five-year warranty. Just read through a few of the customer reviews, and you will quickly see what makes this charger a top choice.

Pros

  • Charges three batteries simultaneously
  • Waterproof
  • Advanced safety features
  • Five-year warranty

Cons

  • Expensive

6. BatteryMINDer 128CEC1

Best Battery Charger For 12v Deep Cycle

Amperage

2/4/8A

Nominal Voltage

12V

Operating Temperature

0°F to +130°F

Weight

3.2 lbs.

Warranty

5 year

If you want to charge up to eight batteries at once, consider this maintainer instead. While it will maintain multiple batteries, you will need to purchase separate Y-connectors to hook the batteries in parallel.

However, this option is ideal for battery storage when your boat or RV isn't in use. It also features an ambient temperature sensor that adjusts the voltage based on temperature sensor readings. Other advanced features include reverse polarity, over-temperature, and short-circuit protection.

With the full-time desulfator, you can reduce the buildup of lead sulfate crystals in the batteries and promote a longer life. On top of that, you can choose the amperage setting for your battery. The 2A setting is good for storage, while the 4A setting is perfect for more deep-cycle batteries. If you use the 8A setting, you can get more power to your AGM or wet battery. As with many of the other top companies, BatteryMINDer provides a comprehensive five-year warranty.

Pros

  • Charges eight batteries simultaneously
  • Full-time desulfator
  • Advanced safety features
  • Five-year warranty

Cons

  • Requires additional equipment for multiple batteries

7. BMK

Best Smart Charger For Deep Cycle Batteries

Amperage

5A

Nominal Voltage

12V

Operating Temperature

unknown

Weight

15.87 oz. 

Warranty

2 year

You don't need to spend a lot of money to get a smart charger for your deep cycle batteries. This charger not only charges the batteries but also diagnoses the battery condition. It also comes with several safety features to ensure your protection.

The waterproof design protects against short circuits, overload, overcharge, over voltage, and polarity reverse. This particular system offers four-stage smart charging that stops automatically when the battery is full.

You can also use it for the batteries on your lawnmower, electric tools, motorcycle, or car. The lightweight design ensures it can go anywhere for power whenever you need it. While the reviews are exceptional, there are a few complaints that the product might not be made with the highest quality materials. However, the company does provide a two-year warranty for your protection. Overall, it's a great smart charger when you need a unit on a budget.

Pros

  • Cheap
  • Smart charging
  • Advanced safety features
  • Lightweight

Cons

  • Durability concerns

8. BLACK+DECKER BM3B

Best Cheap Model

Amperage

1.5A

Nominal Voltage

6/12V

Operating Temperature

32°F to +104°F

Weight

1.3 lbs. 

Warranty

1 year

This low-cost Black+Decker model doesn't just charge 12V deep cycle batteries, but also 6V AGM, wet and gel batteries. Considering the low price, that's quite impressive. Plus, it's simple to connect this charger to your battery with the O-ring terminals and clips.

When the battery is full, charging stops automatically by switching to a float mode. Even though it is low-cost, you aren't sacrificing any protection. It guards against reverse polarity, overcharging, and short circuits.

Plus, this machine comes with a built-in mounting bracket to ensure simple placement. With the AC low voltage compensation, you are guaranteed maximum performance when you need to use an extension cord.

While there are many aspects to this model that make it a winner, the lower price does indicate a cheaper quality of materials. Don’t expect this smart battery charger to last a lifetime, but it does come with a one-year warranty for some protection.

Pros

  • Cheap
  • Provides smart charging
  • Some safety features
  • Lightweight

Cons

  • Only one-year warranty

9. Battery Tender 5-Bank

Best Deep Cycle Battery Tender

Amperage

20A (4A at 5 banks)

Nominal Voltage

6/12V

Operating Temperature

14°F to +122°F

Weight

13.1 lbs. 

Warranty

3 year

At the very top end of the spectrum, you can invest in this battery charger from Battery Tender. It allows you to charge a variety of 6 or 12V batteries at 4A simultaneously. In total, you can charge up to five batteries at the same time, but the company does offer other options. Plus, when the batteries are charged, it will automatically switch to a maintenance mode, so you don’t have to worry about overcharging.

Of course, the biggest downside to this model is the price. On the other hand, for the versatility and function, it’s still quite a good value. In addition, it is going to be heavier than the compact options we showed you earlier, but it’s perfect for storing batteries.

In addition to the exceptional reviews, owners also gain access to the three-year warranty. If you don’t want to buy another battery charger for many years, you can’t go wrong with this model.

Pros

  • Exceptional performance
  • Charges five batteries simultaneously
  • Advanced safety protection
  • Three-year warranty

Cons

  • Expensive

10. NOCO Genius G15000

Best 24V Deep Cycle Battery Charger

Amperage

15A

Nominal Voltage

12/24V

Operating Temperature

-4°F to +104°F

Weight

6.5 lbs. 

Warranty

5 year

You can find both a powerful and lightweight charger without spending too much cash. With this NOCO model, you get a professional battery charger and maintenance tool that can be taken anywhere. Keep in your vehicle, on your boat, or in a workshop. In fact, it's perfect for when you store your deep cycle marine batteries for the winter. This charger works with many 12 and 24V batteries, including AGM, wet, gel, and deep cycle options.

The advanced charging technology will monitor your battery levels and adjust the power accordingly. It also comes with a repair mode to bring life back to old batteries. If you prefer, you can convert the battery charger to a five-amp constant power supply to maintain the onboard computer while the battery is charging.

Overall, the customer reviews are favorable, but a few people have complained about recent durability concerns. However, the company does provide a five-year warranty for your protection.

Pros

  • Versatile
  • Advanced charging technology
  • Five amp constant power supply option
  • Five-year warranty

Cons

  • Durability concerns

Using and Testing Deep Cycle Battery Chargers

The way you use a deep cycle battery charger depends on what type you purchase. The portable battery charger operates quite differently from the onboard charger. We suggest reading the manual first and following the directions given to you.

You can also test the battery charger functionality if you are unsure if the batteries are dead or your charger isn’t working. It is possible to recondition a dead deep cycle battery if you want to avoid buying a new battery.


Care & Maintenance of Deep Cycle Battery Chargers

The most important aspect when using a deep cycle battery inverter charger is to follow the instructions. In addition, when the battery charger isn't in use, you want to store it in a dry and cool location. If anything looks unusual about the battery charger, stop using it, and consult the troubleshooting tips in the manual.


People Also Ask (FAQs)

Is it better to slow charge a deep cycle battery?

Slow charging is the ideal way to maintain your deep cycle batteries. During a slow charge, the battery plates are penetrated by the acid, which doesn’t happen as effectively when using a rapid charger.

Can trickle chargers damage the battery?

If the charger remains connected and doesn’t turn itself off when the battery is fully charged, it can cause damage. It’s often better to invest in a smart charger that shuts itself off when the battery is full.

What happens if you charge a deep cycle battery with a normal charger?

How do you choose between a deep cycle battery charger vs. regular? The deep cycle battery charger completes the job faster and more efficiently than the conventional charger. Smart deep cycle chargers also prevent overcharging, which could lead to battery damage.

How do I know when my deep cycle battery is fully charged?

If the charger doesn’t show you the voltage of the battery, you can check it with a voltmeter. A reading of 12.7V indicates a full battery charge.

What are the best rated deep cycle battery charger brands?

As you read through our deep cycle marine battery charger reviews, you will see that we rely on a handful of brands. In our experience, CTEK, Schumacher, BatteryMINDer, and NOCO are among the top battery charger brands you can choose from.

How do I clean the battery terminals?

If you notice corrosion on the terminals, you want to disconnect the battery and clean it. Use a solution of water and baking soda on the corrosion, but always wear gloves.

What does float charge mean?

The float charge operates at a lower voltage. It minimizes the risk of over-charging and reduces damage. It's also used for maintaining batteries. 

Where is the best place to buy these chargers?

Whether you want an AGM charger or the best solar charger for deep cycle batteries, Amazon is the place to look. The company offers the most extensive selection, and you can read through the 12 volt deep cycle battery charger reviews from customers to get a feel for the durability.

What is the fastest deep cycle battery charger reviewed above?

If you need fast charging or jump start capability, we recommend the Schumacher SC1281. It’s the only model we review above that features these options.


Conclusion

What is the best battery charger for deep cycle batteries? We prefer the CTEK (56-864) if you want the best mix of value and performance. This charger is completely automatic, so you don’t even need to think about the operation.

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