Best Deep Cycle Battery Chargers: (Factors Have to Consider)

Published on: March 28, 2022
Written by Liam Jaxon / Fact-checked by David Rowan

Do you know, a good charger can add more value to your battery!? Additionally, the performance and the lifetime also depended on your charger’s capabilities.

Like other types of batteries, a deep cycle battery also needs the perfect charger for it as it needs to survive and serve for a long time.

deep cycle battery chargers (factors have to consider)

We receive so many queries from our users about the basic features of a good quality deep cycle battery charger, and how can they choose the right one for their batteries. If you get the wrong one at any chance, it may cause damage to your batteries.

So, choosing the best one isn’t too easy. You need to check the requirements carefully to find the suitable one. In this incident, we are here to help you as a helping hand to choose the best one.

In this buying guide, we have recommended some of the top rated battery chargers that might be best for your battery. We analyze details about them. Additionally, we have included a choosing guide so that you can choose more perfectly.

What Is A Deep Cycle Battery Charger? How Does This Work?

This is a unique sort of battery that is not normal for a customary battery. It has exceptional highlights that make it reasonable for charging deep-cycle batteries like those we use in our sporting vehicles. Very much like those that we have recently referenced before, these batteries can attempt to charge and keep up with various kinds of lead-corrosive batteries like AGM, gel, and standard.

These batteries have a stronger and thicker plate than traditional lead-corrosive battery chargers.

They have these amazing features and much more so that they can charge our batteries faster and more productively. This is their primary task – to quickly charge the deep cycle battery.

Difference Between Deep Cycle Battery Chargers and Traditional Battery Chargers

Deep Cycle Battery Chargers are specifically designed to charge deep cycle batteries, which are able to withstand deep and extensive discharges. These chargers are typically heavier duty and able to provide a constant and steady current over a long period of time to ensure a full and proper charge. Traditional battery chargers, on the other hand, are designed to provide a short burst of high current to quickly charge the battery but are not suitable for deep cycle batteries.

How to Choose a Deep Cycle Battery Charger?

Choosing the right charger is very important for your battery as your battery life and performance are also dependent on it. if you pick the wrong charger, then you won’t get the desired performance from your batteries. To choose the right one, you need to look after 3 major requirements.

Charging Speed

This is an important factor when buying a charger for a battery. Charging speed is subject to the overall limit of the battery as well as the resulting rating of the actual charger.

For the most part, low-limit batteries being accused of a high-amperage charger will be charged altogether quicker than high-limit batteries with low-amperage chargers. Henceforth, you ought to remember that prior to choosing the appropriate amperage for your battery charger. High charging velocity will be worthwhile when you are away from home and your battery releases out and about.

Battery Type

There are various types of batteries such as Absorbed Glass Mat (AGM) batteries, Flooded (Wet Cell) batteries, and Gel Cell or Valve-Regulated Lead Acid (VRLA) batteries. Generally, one charger can charge all types of batteries except Gel Cells. So, check your battery type before choosing.

Read more: 4 Bank Marine Battery Charger

Battery Size

Well, we do not mean the physical size of the battery by saying that. We are talking about how many Amperes hours your batteries store. For instance, if you have a full-size typical auto battery that is of 50 AMP hours and you choose a 10 Amp charger, then it will take 6 hours to recharge the battery fully even if the battery were dead completely. For another example, a 100 AMP hour deep cycle marine battery requires a 10 AMP hour charger for about 11 hours to fully recharge a nearly dead battery.

To calculate the total charging time, take the battery AMP hours rating and divide it by the charger AMP rating. And then add 10% extra time to complete charging fully. Now, select a charger for your battery. You may choose a smaller AMP rating charger if you’re not in a hurry.

Desired Outcome

If you need the charger for a motorcycle, aircraft battery, classic car, trolling motor battery, or wheelchair battery, then a low AMP charge will work fine. But if you need to charge quickly, then you need a powerful and fast charger. So, choose a charger by thinking about the outcome of the charger.

And don’t forget to check the special, safe, and innovative features like water & UV ray proof or other smart capabilities.

Battery Chemistry

Another important thing you should consider before buying a deep-cycle battery charger is battery chemistry. Because generally, you can’t use a lead acid battery charger to charge a gel unit or vice-versa. Only if the battery clearly mentions that you can use one charger to charge both of them.

How Many AMPs Do I Need

Deep cycle battery chargers come in different amp ratings. So you must check the number of amp hours that your battery can store, with which you’ll be able to decide which one your battery needs.

You also need to calculate how long the amp charger takes to charge your battery simply by dividing the amp hour by the amps the charger has.

What Size Charger Do You Need

Well, people usually ask what size charger they need for their deep-cycle batteries. To answer this question, you need to know how many AMP/ Hour your batteries store. The size of the charger depends on it mainly. It is known to all that more current putting in the battery means faster charging.

But a large charger on a small battery is harmful as it leads to venting and boiling electrolytes. This damages the battery and shortens the battery life. For a better idea to find out what size charger you need, you need to know the following things.

  1. The flooded battery can accept a 25% charge rate of its capacity.
  2. Gel batteries can accept a 30% charge rate of their capacity.
  3. AGM batteries can accept a 40% charge rate of their capacity.

This means the charge is accepted by the battery depending on battery chemistry. For instance, if you have a 100 Ah flooded battery, then it will be recharged with a 25 Ah or less charger in about 4 hours. Even the battery was completely dead. If you are in a hurry, then you need a large charger, but if you aren’t in a hurry then it’s better to go for a smaller one.

Safety Measures to Take When Using a Deep Cycle Battery Charger

1. Read and follow all safety instructions and warnings in the product manual before using the battery charger.

2. Ensure the charger is connected to a surge-protected wall outlet.

3. Keep the charger away from water and other liquids.

4. Do not expose the charger to extreme heat or cold. 5. Make sure the charger is properly grounded.

6. Do not open or modify the charger in any way.

7. Keep the charger away from children and pets.

8. Do not operate the charger if it is damaged or malfunctioning.

9. Disconnect the charger from the battery before performing any maintenance or servicing.

10. Make sure the battery is properly connected to the charger before operation.

View Our Recommended Top-Rated Deep Cycle Battery Chargers-

NOCO Boost Pro GB150 4000 Amp 12V UltraSafe Lithium Jump Starter

NOCO Genius is a well-known brand worldwide for making battery chargers. NOCO, the manufacturer, has brought this awesome charger with many innovative and helpful features. First of all, this charger is able to charge lithium ion and lead acid batteries at up to 4000 AMP charging rate. Basically, this one can charge your batteries 2X faster. And the charger is compatible with most battery types such as marine batteries, trolling motor batteries, etc.

This is a 12-volt and 6-volt charger as well as a battery maintainer. This charger has the ability to repair your damaged batteries besides maintenance. The cutting-edge technology of the charger delivers superior performance. Additionally, this charger can be used with vehicles with micro-hybrid start-stop and CANBUS-type electrical systems.

The innovative streamlined design of the charge has made this portable, incredibly lightweight and ultra-compact (7 x 12.3 x 2.7 inches). Additionally, this charger offers a rubberized base and external mounting holes that avoid scratches and surface slip. On the other hand, the charger is Ultra Violet (UV) ray and water (IP65) resistant so you don’t need to be worried about protection.

This device has the ability to monitor battery activity to ensure efficient & safe charging. This feature minimizes energy consumption as well as overcharging protection & reserve polarity. However, this charger comes with included spark-proof technology. Another amazing feature is the charger has intuitive LED light indicators that provide charging state feedback visually. Additionally, it provides diagnostic information too. This is always active even when the charger is in maintenance mode.

What we liked

  • Cutting Edge Technology;
  • Effective LED indicators;
  • Water (IP65) & UV resistant;
  • 2X faster charging capability;
  • Able to maintain the batteries also;
  • Elegant design.

What we didn’t like

  • The cable could be longer.

NOCO GENIUSPRO50 Fully-Automatic Professional Smart Charger

The NOCO GENIUSPRO50 50-Amp is one of the famous deep-cycle battery chargers. This pretty good charge can charge both 6-volt 12-volt and 24-volt batteries. This is a microprocessor-controlled battery charger. The innovative microprocessor-controlled charging system is the easiest way as well as a safe system for the batteries. Microprocessors can charge and maintain the batteries at optimal power levels. Also, the charger can give you a speedy & convenient experience. 

This innovative charger also offers automatic voltage detection which determines whether the connected cell is 12 volts, 6 volts, and 24 volts automatically. This feature eliminates the possibility of damaging the batteries. Because choosing the wrong setting can harm the battery. This smart feature can process automatically charging and maintaining multi batteries once your batteries are identified. 

The charger has a constant monitoring battery feature which can charge the batteries efficiently, accurately, and swiftly when needed. This feature also allows the charging cycle to click ON/ OFF in the same way. For this feature, your batteries can be attached to the charger for storage indefinitely without any kind of risk of damage or overcharging.

Additionally, this innovative charger has automatic temperature compensation that can adjust with minimum maintain voltage & maximum charge voltage based on the ambient air condition. The thermal runaway of the charger reduces the current if the charge detects the battery is getting too hot, and this is an automatic process.

Unless it finds a proper connection existence, it keeps the power from flowing with its “auto Start” feature. However, the Desulphation mode allows the batteries to be left disconnected for an extended time period. It also keeps the batteries ready overnight in the cold season.

The charger is compatible with most batteries for classic cars & motorcycles, small batteries, ATV batteries, boat batteries, or marine batteries as well. Also, the LED light indicators and the automatic switch are wonderful and add more value to this charger.

What we liked

  • LED light indicators;
  • Automatic On/ Off switch;
  • Multi-voltage chargers;
  • Full microprocessor-controlled charger;
  • Float mode prevents overcharging;
  • Ideal charger for keeping batteries in storage;
  • Rough plastic housing for the charger.

What we didn’t like

  • No cons.

Tecmate OptiMATE TM-181 Charger

The Tecmate OptiMATE TM-181 is another amazing charger from our top picks. This is the most advanced deep-cycle battery charger. This fully automatic charger is a 12-volt charger as well as a battery tester and maintainer. This smart charger can recognize the difference between sulphated & discharged batteries that other chargers can’t.

This charger offers charging from a low volt of 0.5 along with 2 steps of desulphation recovery. This charger has a waterproof case so you don’t need to worry about damage by water. On the other hand, the charger offers wall mounting and standard battery clips. The battery offers 100-240 volts and 56-60 Hz of input with fully sealed high efficiency.

The charger has automatic control with the cell of ampmatic current. Additionally, another innovative feature is that the charge warns you early of any battery problems. Also, the battery has automatic storage control that optimizes the battery power & battery life. This one is perfect for long-term maintenance of any size of 12-volt lead batteries for marine, deep cycle, automotive, or motorcycle.

The multi-phase desulphation of the charger helps batteries from dead early. The smart Ampmatic control can easily adjust the current to connected batteries of any size (3-240 Ah). It is able to charge your battery faster and the automatic and interactive float charging mode is enabled when the battery gets a full charge. This package is a 3-in-1 solution- charger, tester & maintainer. The dimension of the charger is 12.3x7x3.4 inches.

What we liked

  • Full automatic charger;
  • Able to optimize battery power & life;
  • Offers Ampmatic current control;
  • Fully sealed charger with an included waterproof case;
  • Provides early warning for battery problems;
  • CEC listed highly efficient charging;
  • Automatic storage control of batteries for 24×7.

What we didn’t like

  • A little bit pricey;
  • You charge only 12-volt batteries whereas other chargers offer both 6 & 12-volt charging.

Battery Tender Plus 021-0128 Charger

This one is a smart deep-cycle battery charger from the manufacturer named Battery Tender. This is a smart charger that offers 4 steps of charging. These are Initialization, Absorption, Bulk Charge, and Float Mode charging. The charger is designed to maintain & fully charge a battery at a proper storage voltage without any kind of damage that can be caused by trickle chargers. Additionally, this charger comes with included quick-connect harnesses that are hard to reach.

This charger has an automatic switch feature that enables the mode to float when the battery gets a full charge. On the other hand, the charger also offers a temperature-compensated feature to ensure optimum charging voltage according to the ambient temperature. The charger is able to charge the batteries faster as well as it has safety features against reverse polarity.

This charger can charge as fast as a 3a charger or faster. The Green & Red indicators of the charger help to operate the operation easily. The lights flash in various conditions alternatively. The charger comes with included Alligator clips and a battery tender ring terminal. The dimension of the charger is 11x4x11 inches.

What we liked

  • Safety feature against reverse polarity;
  • Fast charging capability;
  • 4 steps of the charging program;
  • Green & Red indicators;
  • Temperature-compensated feature;
  • Presents automatic switch from full charge to float charge mode.

What we didn’t like

The power cord could be longer.

Black & Decker BM3B Charger

The Black & Decker BM3B charger is a smart charger that can charge both 6-volt and 12-volt battery systems. This charger is compatible with almost all types of batteries such as Gel, Wet, and AGM batteries. This is a compact charger with a built-in mounting option. The dimension of the charger is only 5×9.8×3 inches.

This device has included a vehicle DC plug, “O” ring terminals, and battery clips so along with these, the charger offers a very easy connection with vehicle batteries. It is able to keep optimal charge to the battery with smart and high-frequency charging technology. 

The charger has an automatic switch feature that enables the mode to float when the battery gets a full charge. Also, the charger offers a floating mode monitoring system. With the built-in mounting bracket, the charger can be mounted easily.

This charger is compatible with various types of batteries like antique & classic car batteries, RV battery, vehicles battery, deep cycle battery, lawn mower batteries, ATV battery, snowmobile battery, personal watercraft battery, motorcycle batteries, and many more. The DC connector cable for vehicles is a great addition to this charge and it adds more value.

And, along with charging the batteries, this one is a battery maintainer too. This charger can also take care of your battery and ensure longer life and performance of the battery. Additionally, this charger also has safety protection against dust, oil, and moisture.

What we liked

  • Compatible with both 12 volt & 6-volt batteries;
  • Built-in mounting bracket;
  • Protections against oil, dust, and moisture;
  • Vehicle DC plug, O ring terminals & battery clips;
  • 1.5 Amp charger and maintainer;
  • Suitable for AGM, Gel & Wet battery types;
  • Smart charger with a smart switch.

What we didn’t like

  • Low charging rate; take more time to charge larger batteries.

BMK 12V 5A Smart Battery Charger & Maintainer

All the batteries and their chargers are claimed to be ‘protected’ from overheating, overcharging, undercharging or reverse polarity. Only a few can be found with waterproof and dustproof features. This charger from BMK is water and weather protected so it is safe to use in boats, RV, and other deep cycle batteries. It only works for 12v batteries. Nothing more or less than that won’t be appropriate for this charger. With its 5 amp charging capability, it takes 24 to 48 hours. 

Its multiple smart charging steps make charging safe. Only a little rise in the temperature is all you can complain about. When that happens, just unplug the charger and battery and charge again when it cools off. However, you will find numerous deep-cycle battery chargers at this price point. But there is hardly any good quality maintainer at this price.

Things We Liked

  • Cheap price;
  • For high-quality batteries;
  • Comes with 2 types of connectors;
  • Water and dustproof. 

Things We Didn’t Like

  • May heat up upon overuse.

Schumacher 6V/12V Automatic Battery Charger

Regular deep cycle and AGM type batteries of 6v or 12v require a simple charger which will double as a maintainer as well. As a maintainer, this unit serves 12A current. There is no chance of overcharge because a microprocessor auto adjusts the amperage rate and fixes as needed. 

On the other hand, it also has a reverse hook-up protection system. The system hinders it from charging when the clamps are reversed. This way, this charger protects the batteries from reverse polarity.

For your ease, there are different modes for different purposes. Like the charging mode, there is also a float mode that ensures the battery’s maintenance. The only thing to complain about this charger is its customer service. It is nonresponsive and almost nonexistent. This makes it a risky buy; if you purchase from a less trusted seller, it can’t be returned.

Things We Liked

  • Energy efficient;
  • Maintainer as well;
  • Protects from overcharging and reverse polarity.

Things We Didn’t Like

  • Not high-end;
  • Only for deep-cycle batteries. 

BatteryMinder: 2/4/8 AMP Battery Charger

The different amperage settings and ability to charge several batteries at once make this charger money-saving. With one charger you can charge batteries of different conditions from good to worse. The desulfation of this charger gives life to decades-old batteries on which you may have lost hope. 

The voltage level adjusts automatically through the temperature sensor. The charger simply detects the temperature and fixes the voltage as per requirement. Besides, with a Y connector, you can charge up to 8 batteries with this charger. A great hack to save money. A clip connector, quick connector, and ring terminal are coming in the package with a charger and temp sensors.

The price is somewhat higher compared to other chargers we have reviewed. But this charger never fails,  nor will it give you a headache. In fact, it will help you to save bucks by purchasing different chargers of different amperages. If you own several automotive batteries, then this desulfator cum charger is all you need.

Things We Liked

  • Easy to use;
  • Multiple amperages;
  • Useful to prevent sulfation;
  • Capable of charging multiple batteries at a time. 

Things We Didn’t Like

  • No cons.

Energizer- 2 Amp Battery Charger

The ENC2A battery works for almost any automotive and marine batteries of 6V and 12V. It also has 2 different connectors so that it can be paired to n#any type of battery you want. It is cheap yet backed by a long 5 years of warranty, what more do you expect?

We chose this battery charger for reviewing because it was ‘smarter’ than other chargers. Its charging process involves 7 identical stages that help to maintain, repair, and charge the batteries safely and soundly. First, it will diagnose the battery whether is worth a charge or not. Secondly, in the pre-charge stage, the charger supplies a small current to prep up the battery for a big load ahead. Thirdly, with a soft start, the actual charging process starts.

In the following stages, with continuous current and voltage, the charging goes on. When the charge is full, it automatically disconnects the battery. If the charger is left connected and the battery falls below 12 VDC then that charging will resume.

There is a 50/50 chance with the performance of this battery. You must keep in mind the requirement of the charger while using it. A wrong application may damage both the battery and charger.

Things We Liked

  • 2 types of connectors;
  • Compatible with a wide range of batteries;
  • Cheap price;
  • UL std approved. 

Things We Didn’t Like

  • Slow charging for low voltage batteries.

BLACK+DECKER 2 Amp Charger for 20V Lithium Battery

The most significant thing about this charger is, it gets the job done in less than an hour. The advertisement says, it is only for lithium-ion batteries from the same makers. But it practically goes with any Li-Ion batteries of 16V to 20V we use in cordless power tools. 

The charger merely weighs a pound and sizes 8.2 x 4 x 9 inches. There is an indicator light to indicate when the battery is full. The package includes a pair of Battery Pack so that you can charge one when the other one is being used; very handy isn’t I? So, the price that seemed higher at first makes sense now.

For professionals, it is a must-have in their workshop to stay prepared all the time. Apart from the reasonable price and useful accessories, a long and promising warranty has been offered for this charger.

Things We Liked

  • Fast charging;
  • Optimizes batteries;
  • Comes with accessories;
  • Long warranty. 

Things We Didn’t Like

  • Only for limited Li-ion categories.

Deep Cycle Battery Charger FAQs

How Fast Will Be Able to Charge a Deep Cycle Battery?

Deep cycle battery charging will vary depending on specific factors: charger, temperature, and battery size. For example, a 100AH battery at room temperature will generally take around 5 to 6 hours to arrive at the 80% limit.

Will a Battery Tender Charge a Deep Cycle Battery?

Battery tender chargers are designed to keep pace with and charge a wide range of battery types, including deep cycles. These choices will often be well-known among rig owners who use their RVs as occasional vehicles instead of all year.

These battery chargers will guarantee that your device’s battery stays crispy during those power months. This will give you the basic advantage of not having to deal with the potentially harmful effects of a lot of stream chargers.

Does Deep Cycle Battery Require an Exceptional Charger?

Deep cycle batteries now and again will be submerged in their charge level which is expected to run boats, hardware, or an RV. Energizing them back requires utilizing an exceptional charger to return the battery to its appropriate voltage.


Hopefully, we could have helped you to figure out the best one for your batteries. We picked the top 5 deep cycle battery chargers with a detailed review. We highly recommend these chargers as they have the abilities to take proper care of your batteries.

Additionally they are able to satisfy users and they did. Just pick that one which is mostly fit with your applications. And if you have any question or inquiry then just leave your valuable comment. We’ll get you soon. Best of luck.

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About This Writer

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Hi, I am responsible for the 'Homeowners Power Solutions' category. My name is Liam Jaxon and a licensed technician with 7 years of experience in vehicle batteries, electrical gadgets, and home appliances. My working experience in different residential & light commercial electrical sectors and the automobile industry helped to acquire vast knowledge in this industry.

Hi, I am responsible for the 'Homeowners Power Solutions' category. My name is Liam Jaxon and a licensed technician with 7 years of experience in vehicle batteries, electrical gadgets, and home appliances. My working experience in different residential & light commercial electrical sectors and the automobile industry helped to acquire vast knowledge in this industry.

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