The Best Deep Cycle Battery Chargers in 2020

Comparisons + Buying Guide + Specific Reviews

Battery chargers are essential for keeping your battery up and running when you need it Not all battery chargers are the same. A battery charger designed for one type of battery chemistry can't be used for other types of batteries.

For example, a charger for an AGM battery shouldn't be used with gel cell batteries. A high capacity charger could shorten the life or outright kill a standard battery. This is why you need the best deep cycle battery charger for a deep cycle battery and the right type of battery charger for 12 volt house batteries.

Top 5 Best RV Battery Chargers - Comparison

What's a Deep Cycle Battery Charger?

A deep cycle battery charger is simply a charger designed for deep cycle batteries. They have thicker plates than the standard flooded lead acid battery, and the plates are usually solid instead of spongy.

All Deep cycle battery chargers are designed to charge these batteries as quickly as possible.

Best Deep Cycle Battery Chargers

Types of Deep Cycle Battery Chargers

A standard battery charger charges the battery to nearly full, and the simplest ones could over-charge a battery because it is akin to pouring water into a glass until it is full and continuing to do so even if it overflows.

Deep cycle chargers are designed to charge deep cycle batteries, quickly charging these batteries though they may be 80% discharged.

More advanced deep cycle battery chargers can monitor the battery's energy level. It recognizes when the battery is 80% to 90% full and than drops off the energy flow to ensure that the battery isn't overcharged.

Automatic chargers automatically switch to a float-mode with monitoring, automatically charging the battery as required, though they cannot be used indefinitely.

What to Consider before Purchasing the Right Charger? 

Battery chemistry is one of the most important things to consider before buying a battery charger. A charger designed for gel batteries shouldn't be used on lead acid batteries unless it explicitly states it is safe to use on both types of products.

A potential consideration is the environment

Not all battery chargers can be used outdoors. If you want to be able to charge a marine starting battery while out on the water and/or during a storm, you may want a battery charger that can handle exposure to the elements.

Consider the entire electrical system

If you intend to run batteries in a bank, do you want a battery charger that can simultaneously charge all batteries in the bank? If you're charging a battery from solar panels or another irregular source of renewable energy, you probably need to have a charger that can accept that power. This situation may require having a ba.

Another factor is the personal cost of a dead battery

If you can't stand a battery going dead two or three hours sooner than expected, you may want a battery charger that keeps a battery topped off. This means buying a more advanced battery charger that can sense the battery charge level and adding a little more power as necessary.

You should also consider

if you want a battery charger that can extend the life of your batteries. Not all chargers can apply an "equalizing'. charge that reverses the sulfation that otherwise destroys the plates over time.

Here are The Top 11 Best Deep Cycle Battery Charger Full Reviews

After doing a proper research the market and specific parts of the deep cycle batteries, We listed here "Top 10 Deep Cycle Battery Charger" what you can consider to choose the perfect one for your RV deep cycle battery. We hope- you get honest reviews and win to choose one of them listed below_

01) NOCO Genius Model UltraSafe Smart Battery Charger

11 Best Deep Cycle Battery Charger Reviews 2020 (An Ultimate Guide) 6

Editor Rating: 5.0 out of 5

​Price: Check on Amazon

The NOCO Genius Model battery charger is on the cheap side. It can charge both 6 volt and 12 volt batteries and comes with a number of safety features.

This NOCO Model is spark-proof. It has reverse polarity and over-charge protection. Also, It lets you charge deep cycle batteries, standard lead acid batteries and AGM batteries.

You have to pay for its more expensive siblings to be able to charge lithium batteries. The battery charger is able to de-sulfate batteries.

That feature is not often found on battery chargers this cheap. However, that mode is only an option for 12 volt batteries. It is of average size and weight.

02) Battery Tender Plus 125 Amp Battery Charger

11 Best Deep Cycle Battery Charger Reviews 2020 (An Ultimate Guide) 7

Editor Rating: 4.5 out of 5

​Price: Check on Amazon

The Tender Plus batter charger is safe to leave connected to your battery to keep it at optimal charge for an extended period of time. It is smart enough to determine how to adjust the trickle charge as the temperatures outside change.

This tender plus charges batteries somewhat slowly; it puts out around 3 amps. It comes with clamps, but they're sometimes a challenge to get into place. 

The ten year warranty is pretty much a myth. It is almost impossible to get the unit repaired under warranty.

They charge you shipping in all cases, and they often charge you an evaluation fee for finding out what is wrong with it And that's assuming you can get a hold of them to find out how to send it back in the first place.

In reality, you have a 90 day warranty at which point they'll replace it if it fails and can't blame it on you.

The battery indicator lights are useless, a direct red/green notification that may give you green when it is barely charged. You could get a green "good° light and the battery still can't start the motor.

03) OptiMATE 6 Ampmatic Battery Saving / Battery Charger

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Editor Rating: 4.5 out of 5

​Price: Check on Amazon

This battery charger is usable as both a battery charger and battery maintainer. It is intended to charge only 12 volt batteries. Conversely, it can charge standard 12 volt batteries, gel batteries and AGM batteries.

It is smart enough to recognize when the battery is sulfated and dead, so it won't overcharge a dead battery and cause it to explode. It has a desulphanation mode, as well This unit costs more than average.

However, it can accept any power input from 100 volts to 240 volts, 50 Hz to 60 Hz. It is larger and heavier than average.

The instruction manual that comes with the unit is nearly indecipherable. Getting customer service for this product can be a challenge.

04) SAmp Car Battery Charger for AGM GEL Lead-Acid Batteries

Editor Rating: 4.5 out of 5

​Price: Check on Amazon

One of the points in favor of this model is that it can charge nearly everything. It can be used with lead acid batteries, AGM batteries, gel batteries, and SLA batteries.

This battery charger comes with all the hardware you need to hook it up. This battery charger won't let you accidentally burn it up by accidentally reversing the clips. It has a basic battery level indicator.

The battery charger is nearly water proof and dust-proof. You can use it outdoors, but it shouldn't be immersed in water.

In theory, it will work in the pouring rain. It has basic over-current protection and short-circuit protection.

05) BLACK+DECKER BDCAC202B 20V Lithium 2 Amp Charger

11 Best Deep Cycle Battery Charger Reviews 2020 (An Ultimate Guide) 9

Editor Rating: 4.0 out of 5

​Price: Check on Amazon

This battery charger by Black and Decker stands out for its low price. It is good for both 6 volt and 12 volt batteries. Better yet, it can charge AGM, gel and standard wet batteries.

However, it is mostly to be used for maintaining charge. Don't use this to try to recharge a nearly dead battery.

This battery charger is easy to use, since it comes with 0-rings, battery clips and other hardware. And it comes with a mounting bracket so you can position it properly and leave it for hours.

On the plus side, this is perhaps the only battery charger on this list that comes with a DC plug so you can charge and maintain the battery from inside your vehicle. It is a little heavier than average. 

However, it is compact. If the unit you receive turns out to be bad, getting customer service and/or a refund is almost impossible.

06) Schumacher SC-1200A Fully Automatic Battery Charger

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Editor Rating: 4.0 out of 5

​Price: Check on Amazon

The Schumacher automatic battery charger is average in terms of price. You can sometimes find it at a better price on sale. This battery charger can charge both 6 volt and 12 volt batteries. It can automatically detect the type of battery it is charging.

This charger has modes for rather rapid charging and slow charging. It can also be used to maintain battery charge. However, it doesn't perform this function very well. For example, it can only maintain a battery if the battery isn't being drained by anything. 

The Schumacher will charge batteries but may only do so to 95%. It has an indicator to warn you if you've hooked it up incorrectly. However, it can overcharge batteries and may °cook° them in the process. The company has decent customer service.

07) BatteryMinder AMP Battery Charger-Maintainer-Desulfator

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Editor Rating: 4.0 out of 5

​Price: Check on Amazon

This combination battery charger / battery minder is at the expensive end. Part of the reason is the fact that it has the mode that lets you de-sulfate the battery, extending its operating life. It can reverse sulfation, a major case of battery failure.

This battery charger is smart enough to adjust its charging level to the battery discharge level due to the current temperature.

The battery charger can be set to charge slowly or maintain charge at 2 amps, slowly charge at 4 amps or charge relatively quickly at 8 amps. You should use the 4 amp setting when charging multiple batteries or a single deep cycle battery.

If you have a battery bank that needs to be charged, this is the best deep cycle battery charger for you It can maintain up to eight batteries at the same time This does require Y-connectors that are sold separately.

Another benefit of this battery charger is that it can use almost any source of incoming power. It can accept power between 90 volts and 240 volts and alternating currents at frequencies between 47 Hz and 63 Hz. You can literally use it anywhere on the planet. The charger itself is quite energy efficient, and it is legal to buy in California.

08) Energizer ENC2A 2 Amp Battery Charge, Maintainer

Editor Rating: 3.8 out of 5

​Price: Check on Amazon

This battery charger stands out for its price — it is one of the cheapest smart battery chargers on the list. It is smart enough to switch from charging mode to float mode so it doesn't over-charge the battery. The battery charger is easy to attach to the battery. It comes with both 0-ring terminals and battery clips.

This is a slow battery charger; it generates 2 amps, enough to slowly charge a battery overnight in most caes. Conversely, it can be used as a battery maintainer.

This battery charger can be used with both 6 volt and 12 volt batteries. It is specifically for wet lead-acid batteries, but you can use it on a wide array of batteries. You can use it for lawn mower batteries, RV batteries, motorcycle batteries and even classic car batteries. 

It has a five year warranty. Be careful of where you get the battery charger, since the warranty may not apply if you buy it through third party websites. The battery charger is somewhat light and compact.

09) CTEK 56-864 Fully Automatic 8 Step Battery Charger

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Editor Rating: 3.8

​Price: Check on Amazon

This battery charger is middle of the pack in terms of price. One of the benefits it brings is a variety of charging modes so it can keep things fully charged, maintain batteries and give your battery the longest possible operating life.

This battery charger resists both water and dust. The safety factor is heightened by the reverse polarity protection, the system that can't short circuit and the fact that it is easy to use.

One unique benefit of this model is the exceptionally wide operating temperature range. It will work whether you're in the hot desert sun or Arctic wastes. This battery charger generates rather clean power.

The current won't vary very much. When the current does vary or "ripple., it will age the positive battery electrode and could continue on to damage sensitive electronics in the car. It is rather lightweight for this type of product.

10) Guest ChargePro On-Board Waterproof Battery Chargers

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Editor Rating: 4.0 out of 5

​Price: Check on Amazon

The deep cycle battery charger is suitable for flooded, gel and AGM batteries. It has an advanced microprocessor to provide accurate level of charge. This battery charger is water-proof, perfect for taking in any type of environment.

You do pay more for this feature. This battery charger can accept both 120 volts and 230 volts; you can use nearly any type of power source to charge your battery with this battery charger. 

One issue with this product is the fact that the manufacturer makes it almost impossible to get service or a replacement if the charger you bought was defective. They'll even make you jump through hurdles if they help you at all if the battery charger was professionally installed.

11) BMK Brand 12V 5A Smart Battery Charger / Portable Battery Maintainer 

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Editor Rating: 4.4/5

​Price: Check on Amazon

The BMK portable battery charger can go anywhere you want to go. It is water-proof since it is designed for use on boats, so you know it will work just fine in the pouring rain or dust storm. 

This model can charge batteries anywhere between 15 amp hours and 100 amp hours, though a higher Ah rating requires more time. It has four stage smart charging, and it stops as soon as the battery is charged.

This will extend the life of your RV battery. The built-in LED indicator tells you what state the battery is in before you remove it, so you won’t disconnect the charger too soon.

While we’re listing this as an RV battery charger, we need to add that it can recharge almost any battery. It could recharge boat batteries, lawn mowers, electric tools and even your electric vehicle batteries.  

Since the battery charger weighs barely over a pound, you can even take it with you as an emergency battery charger for any other compatible battery.

Multiple built-in protective

This model has multiple built-in protective measures. It has reverse polarity protection, short circuit protection, over-voltage protection and over-current protection. It also has overload protections.

It uses constant pulse current during battery maintenance mode to avoid both overcharging and discharging the battery. The manufacturer fully loads the battery chargers and does burn-in testing so you know it won’t burn out after the first couple of uses.

One of the downsides of the unit is that it has a higher than average failure rate after several months of use. It will almost certainly work out of the box, but it may stop working after two months of continual use.

An occasional issue is when it gets stuck on; this can melt the battery as it overcharges, because there is no thermal protection on the device. Check how hot it is to avoid this from happening to you.

Frequently Asked Questions (FAQ)

01. How long will it take to charge?

The charge time depends on the amperage of the charger you're using and the battery charge level. I general, the charging process is faster with a high amp charger than a low amp charger. A forty amp charger could recharge a depleted car battery or another starter battery to the point you can start the motor in a few minutes.

If you have a two amp charger, you may barely be able to maintain the charge of a bank of batteries and won't be able to power it up. If you have a single deep cycle car battery or toy battery, a two amp charger like a trickle charger could charge it up to twenty-four hours. At four amps, that same process takes about twelve hours.

02. Do I need to cycle my battery?

In general, charging up a battery and then using it up as a charge cycle. Charge cycles are used as a measure of the battery's expected life, since many batteries are only rated for so many charge cycle. However, this number may be in the hundreds or the thousands. Power cycling as a way of maintaining the battery can take two forms.

One is fully charging the battery, disconnecting it, letting it drain, and then completely recharging it This process ensures that the battery's chemical memory remains at 100%. This is in contrast to using a battery to 80% or 50% of its capacity, again and again, and it chemically setting such that it can only recharge to that threshold.

One different form of the battery cycling

A different form of battery cycling you should do to maintain the battery is de-sulfation. This process typically runs a much higher voltage level into the battery so that the lead sulfate layer that's formed on the plates is reabsorbed.

Some battery "re-conditioners° use a very short pulse at high voltage to reverse the crystallization process, but this can damage the plates of a wet battery. The best deep cycle battery chargers have a separate mode that you should use every 10 to 40 days (depending on battery usage and environmental conditions) to de-sulfate the battery to maximize its operating life

03. What is the maximum charge for a 12-volt battery?

The average 12 volt battery actually has a voltage of around 126 volts when fully charged. When discharging, the voltage could drop as low as 10 volts. When the battery is charging, voltage could reach 15 volts, but those voltage levels for an extended period of time will damage the battery. A reading of 13.3 volts would be high unless this reading was taken right after charging. Resting volts should be 127 volts, at most.

04. Can trickle chargers damage battery?

If you leave a battery connected to a trickle charger, it may overcharge the battery. The odds of this are reduced if the trickle charger automatically switches to "float-mode when the battery is fully charged. If the trickle charger lacks this feature, you'll likely overcharge and damage the battery.

However, you should not leave a trickle charger permanently connected to a battery in storage. And using the wrong type of trickle charger always risks the battery, such as using a charger for deep cycle batteries on lithium batteries

05. How many amps are in a fast charger?

Your smart phone charger will generate about one amp of current, while quick charging will generate around two amps. A fast charger for 12 volt batteries could generate anywhere from six to ten amps. A few 20 amp charge rates are available, and these are popular with recharging starter batteries.

06. Can I use a charger with higher amperage?

If the voltage generated by a charger is too high, you'll kill the battery. This means any device you select needs to be designed to charge the device you're trying to charge first and foremost, regardless of the amps it puts out The amperage the charger needs to put out must meet or exceed the amperage required by any device battery you're charging. Beyond that, you can use any charger assuming it can deliver the power at a rate that doesn't overload the battery.

07. What does STD AGM and gel mean on a battery charger?

AGM stands for absorbed glass mat, a type of lead-acid battery. Gel batteries are different from standard batteries, often labeled STD. Most chargers are designed for one or two types of batteries. A battery charger that says STD AGM and gel on the top is safe for all of these types of batteries. Always check the types of batteries the charger says it can handle before you use it

08. Can you use a regular battery charger on a gel battery?

Not all battery chargers can be used on a gel battery. Just because a charger has a gel or AGM battery, it may not be suitable to use on a true gel battery. If you use a regular battery charger on a gel battery, it may not fully charge the battery.

09. Do I need a special charger for my OPTIMA brand battery?

Use a battery charger that explicitly states it can charge AGM batteries before you use it to charge the average Optima brand battery. However, even battery chargers rated to charge AGM batteries may not recharge a deeply discharged Optima brand battery. The best deep cycle battery charger for an Optima battery is a charger designed for that type of Optima battery.

10. What is a float charge on a battery?

Float charge is the low level of charge given when necessary as the battery discharges. Hence, it is °floating'', slowly allowed to flow into the battery to top it off and help it fill up. The floating charge mode is only practical on smart batteries that can actually detect the charge level and then feed the right level.

Final Verdict

The best deep cycle battery charger is one designed to charge the types of batteries you need recharged in the time frame you want. The best chargers will operate in the conditions you'll experience, be it out on a campout connected to portable solar panels or out in the rain.

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John S.

John Smith a 37-years-old author, traveler, writer, blogger, and a camper. As always, He loves to watch the beauty of the world. For this reason, He's traveling, camping, and writing to share the experiences with the people.