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Best Deep Cycle Battery Charger: Keeping you Charged


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NOCO Genius G15000

Best Deep Cycle Battery Charger

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Whether you have one battery or multiple, the NOCO Genius G15000 can charge pretty much anything you put in front of it, including Li-Ion deep cycle batteries. On top of that, the NOCO comes with a set of O-ring connectors that include alligator clamp attachments for quick transition from one to the other.

Even better, the NOCO also functions as a direct power supply on its own, able to deliver a continuous stream of 13.6V electricity to power different accessories like a tire inflator. The G15000 comes with a jump charge function that allows you to give a jump charge to a starter battery, too, though this is not a jump starter.

Best Deep Cycle Battery Charger: Keeping you Charged

Whether you RV on the weekend, for vacations, or year-round, one of the best qualities of RVing is that you do not have to give up the creature comforts of a house. Of course, you still need to be able to power all of the different appliances and devices that make your home so comfortable.

To ensure that you do not run out of power anytime soon, the most common solution is to use deep cycle batteries rather than a starter battery. That said, all batteries eventually run out of juice and need to be charged from time to time for a refill.

That is why we put together a list of the nine best deep cycle battery chargers for your RV, identifying what makes each special. Then we provide a helpful buyer’s guide so that you can navigate the dizzying litany of features and specs.

If you need more info on the "how-to" then check out our guide to charging RV batteries

Want to know more about deep cycle battery charging?

  • Distinguish niche categories for different deep cycle battery chargers
  • Prioritize functions and versatility over speed and ease
  • Tell you what features are most relevant and which are just icing
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Things to Consider When Buying a Deep Cycle Battery Charger for your RV

Battery Type

The different types of deep cycle batteries require slightly different recharging currents and voltages for the different charging stages. If you use the wrong kind of deep cycle battery chargers, you run the risk of significantly decreasing the battery’s lifespan or even ruining the battery altogether.

Even if the product states that it can charge the type you use, make sure it delivers the proper amps and voltage for each charging stage. While this may not be much of an issue with high-quality units, it can be a bigger problem for simpler or cheaper products.

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This is easily one of the most important factors when choosing which product to buy. Deep cycle batteries come in many different varieties, with the most common types being Flooded Lead-Acid (FLA) and Valve-Regulated Lead-Acid (VRLA).

VRLA batteries are also called Sealed Lead-Acid (SLA) and come in 2 different types as well those being Absorbent Glass Mat (AGM) and Gel Cells. There are also Lithium-Ion (Li-Ion) deep cycle batteries that perform better than the rest, but they are also the most expensive.

Charging Modes

Depending on the condition of your battery and the Depth of Discharge (DoD), you may need something capable of providing more than a simple charge. If you let your lead acid battery get in bad condition, you may also require a product that can restore the cell and recondition it.

Keep in mind, if your battery is in deplorable condition, you will likely need a charger that can desulfate your battery. That said, not all forms of sulfation are reversible, so just because a product claims it has a desulfation mode does not mean it can restore extremely damaged batteries.

lead acid battery showing signs of sulfination around the terminals

Reconditioning the battery chemistry occurs after desulfination when the lead sulfate separates, and the charger then regasses the lead into lead oxide. Desulfination pulses high voltage and amp current while the reconditioning uses a high voltage with a low amp current.

All deep cycle battery chargers at least provide a bulk charging mode, which gets your cell to a 70 to 80-percent charge, as well as an absorption charge mode that gets it to 95 to 100-percent charge. Most decent units also have a float charge function, which keeps it topped off without overcharging it as trickle deep cycle battery chargers can.

More advanced deep cycle battery chargers also include stages that test the health of the cell at different steps in the process. The most common charge test stage is the soft start, which determines whether the battery can accept a charge in the first place.


Most deep cycle chargers include a couple of different protections, with some offering more than others. The most common types of charger protections are short circuit protection and reverse polarity protection to prevent damage to either the battery or the charger unit.

After that, many products also offer protections to prevent overcharging or over-discharging. Getting a little bit more involved, protections to prevent over-volt or over-current charging further ensures the life of your battery as well as its charge.

Finally, many also often include a system to monitor the temperature of the cell you are charging to prevent degradation or an improper type of charge. Keep in mind, units without protections can overcharge the battery, which reduces its lifespan or even ruins the battery altogether.

Outdoor Resistance

This may or may not be an essential considering depending on where you charge deep cycle batteries. If you use your RV for weekend trips or periodic vacations, chances are you recharge your deep cycle batteries in a garage or some other protected controlled environment.

In many instances, you likely do not need to worry too much about charging during a rainstorm. However, if you live in your RV or spend significant amounts of time RVing in general, you might need to recharge your power source away from home.

In this instance, having a product that can withstand the rain might be necessary, mainly depending on the RV park. This also applies to shock resistance, since you cannot guarantee the wiring away from home ahead of time.

Another “resistance” to consider is the temperature since deep cycle batteries need to be charged at different voltages and currents depending on the temperature of the unit your charging and the ambient temperature. Most good products include protections to prevent the charger from using too high a voltage or current in hot temperatures.

However, cold temperatures present a potentially more significant issue, particularly if the unit is limited by the maximum current it can push. This can be an issue for both regular RVers as well as occasional RVers since deep cycle batteries are usually housed in the vehicle or a garage– neither of which are necessarily temperature controlled.

Charging Speed

While the charging speed might seem important, it is more of a convenience factor than anything else. Though it is not the most accurate measurement, one of the best ways to gauge the charging speed of your product is its input amps.

However, this is not the only factor that impacts charging time, but it is one of the few manufacturers provide the details of.

Keep in mind, you should not allow your deep cycle battery to reach a DoD that requires an extensive charge as this can shorten the lifespan of your power unit. At the most, you can allow your battery to reach a DoD of 50-percent as this is the DoD most manufacturers use when rating the number of cycles a cell can undergo as well as how long a charger takes to recharge a maximum amp hours.

Best Deep Cycle Battery Charger for your RV: The Results

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

Most Powerful

NOCO Genius G15000 12V/24V 15 Amp Pro-Series Battery Charger and Maintainer
  • A powerful, professional grade battery charger and battery maintenance tool designed to recharge all types of batteries rapidly in workshops, garages or those you simply want the best.
  • Perfect for keeping your vehicles fully charged and maintained during year-round battery maintenance or long-term storage for improved performance and longevity. Power consumption: 255 watts (Max)
  • Works with all types of 12-volt and 24-volt lead-acid batteries, including wet, gel, and AGM, or any common automotive, deep-cycle, marine, or maintenance-free battery.
  • Keep your battery fully charged without worry or overcharge. Simply plug-in and let our advanced charging technology automatically monitor and maintain your battery. Progressive repair mode for heavily sulfated 12v batteries.
  • Use our advanced repair mode to reverse the damaging effects when batteries are left uncharged for extended periods to improve battery performance and longevity.

Out of all the products we reviewed, few can compete with the NOCO Genius G15000 in terms of sheer versatility. Not only does the NOCO charge the traditional types of lead-acid batteries (gel and AGM), but it also charges the less common lithium-ion and AGM+ batteries as well. Not only does the NOCO charger charge more types of batteries, but it charges both 12V and 24V batteries, making it perfect for RVs with a robust electrical power system.

Beyond the sheer versatility afforded, the Genius G15000 charger also charges quicker than the other options we reviewed– for the battery types that allow for more rapid charging. The NOCO blows most of the competition out of the water with a maximum current rating of 15 amps. This massive increase in charging current drastically reduces the amount of time it takes to charge the battery.

  • PROs

    • Suitable for all types of batteries
    • Charges quicker than most
    • Has a low volt and desulinating charge
    • Has numerous protections
  • CONs

    • Is a more expensive product
    • Has mediocre cables

Bottom-Line: Regardless of the type of deep-cycle battery you use, the NOCO Genius G15000 can charge it and generally quicker than most of the other options on our list.

LST 12V 5A Automatic

Best Maintenance Options

LST 12V 5A Automatic Battery Charger Maintainer Smart Deep Cycle Battery Trickle Charger for Automotive Car Boat Motorcycle Lawn Mower Marine RV SLA ATV AGM GEL CELL WET& FLOODED Lead Acid Battery
  • √ Wide Application – Charge fully drained 12V Pb/SLA/GEL/AGM/VRLA/sealed lead-acid batteries and WET/FLOODED for maintenance, it’s smart battery charger for boat, trolling motor, car, automotive, motorcycle, automobile, lawn mower, lawn tractor, camper, watercraft, powers-port, electric vehicle, back-up generator, etc.
  • √ Multi-Protection – LST trickle battery charger ensure ultimate safety protect against Reverse Polarity, Short Circuit, Over Voltage/Current, Over Charge/Discharge, Overload, Overheat; Spark proof during lead connection; Water and dust resistant battery maintainer charger, full-loaded and burn-in test proves its stable performance and high reliability.
  • √ 7-Stage Automatic Charging – [Desulfation – Soft Start – Bulk Charge – Absorption – Test – Recondition – Float], charge and maintain your battery wherever you go; LST motorcycle battery charger monitor the whole charging process, automatically switches to float mode after fully charging the battery by MCU controlled; LST battery trickle charger will recover batteries more effectively and extend the battery life.
  • √ Intuitive LED Indicator – 12V 5A deep cycle battery charger provide visual feedback of battery capacity and diagnostic information accordingly, efficiently prolong the lifetime of the battery. Input 100-240V, ultra-compact, portable and lightweight with the mounting holes, easy to carry the boat battery maintenance charger everywhere.
  • √ 100% Satisfactory Trickle Charger – 12 volt battery maintainer charger features with detachable alligator, ring adapters and an extra SAE extension cord; LST automotive car battery charger maintainer offer lifetime quality warranty & 12-month refund & timely 24/7 after-sale services, just get lst motorcycle charger with confidence.

Whether you have a small system or an extensive array of batteries, the LST is perfect for keeping them charged and in good working order. With eight different types of protection ranging from the overall battery capacity to the individual power feed, the LST maintains a stable feed to keep them going.

The LST also has one of the more rugged designs that we came across, sporting an IP65 waterproof rating that is more than suitable for use outdoors during a rainstorm. Even better, the LST also has a 7-stage charging cycle to provide the specific kind of charge your battery requires, regardless of its discharge state.

It is worth noting that the LST performs much better at maintaining batteries already in good condition than it does recover damaged or sulfated cells. The LST automatic charger also only works on 12V batteries, though it works with the three most common types of deep cycle batteries.

  • PROs

    • Is a less expensive product
    • Has 7-stage charging
    • Provides numerous protections
    • Is IP65 waterproof
  • CONs

    • Only charges 12V batteries
    • Better for maintenance than charging

Bottom-Line: If you only use 12V batteries and stay on top of their discharge cycles, the LST is easily one of the best units for maintaining their health.

Battery Tender Plus 021-0128, 1.25 Amp

Battery Tender Plus 12V Battery Charger and Maintainer: 1.25 AMP Powersport Battery Charger and Maintainer for Motorcycles, ATVs, UTVs – Smart 12 Volt Automatic Float Charger – 021-0128
  • STAY CHARGED: Provides a full charge to your powersports vehicle’s battery before switching to float mode to maintain proper voltage levels for safe, long-term storage without overcharging
  • EXTEND BATTERY LIFE: Compatible with all 12V lead-acid, flooded, AGM, and gel cell batteries. Complete 4-step charging program (Initialization, Bulk Charge, Float Mode) allows for optimization of battery power, without overcharging
  • INCLUDES: 12V, 1.25 AMP battery charger, fused ring terminal and alligator clip accessory cables, 10-year warranty, and lifetime customer support
  • EASY TO USE: Low maintenance design is quick and easy to use, this universal powersport vehicle charger and maintainer is 4.87 x 3.25 x 2.93 inches, 1.45 lbs (charger only)
  • MONITOR POWER LEVELS: Solid state two-color LED light indicates the state of the charge and if the battery voltage drops too far under load, charging will resume full charger output power

The Battery Tender Plus offers one of the most straightforward uses that we came across without any buttons or controls to worry about. All you have to do is connect it to your dead battery, plug it into the AC outlet, and the Battery Tender Plus takes care of the rest.

While not quite as advanced as some of the other models we saw, the Battery Tender Plus still comes with a solid 4-stage charging cycle. On top of that, the Battery Tender Plus can charge batteries as quick as other chargers pushing more than twice the amps while still providing a safe current to protect your battery.

The Battery Tender Plus also features an easy to read display that is clearly labeled, though it can occasionally give inconsistent readings depending on the battery’s health and internal components. Make sure not to leave the Battery Tender Plus outdoors as it does not offer any kind of dust or waterproofing.

  • PROs

    • Is a less expensive product
    • Is easy to use
    • Has 4-stage charging
    • Can charge a wide variety of batteries
  • CONs

    • Inconsistent charge readings
    • Is not weather-resistant

Bottom-Line: As one of the original “set it and forget it”, the Battery Tender Plus still performs reliably and effectively, even if some competitors are more advanced.

BLACK+DECKER BM3B Fully Automatic 6V/12V

Best Budget Charger

BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals
  • Charges and maintains 12 volt and 6 volt AGM, GEL and WET batteries
  • Easy connection to vehicle battery using battery clips and O-ring terminals
  • Stops charging automatically when battery is fully charged or topped off, switching to float mode monitoring
  • Built-in circuit protection guards against overcharging, reverse polarity, or short circuit; ETL certified for performance and safety
  • Mounting bracket built-in to charger for convenient placement

When you need a charger but do not have a lot of money to spend, the BLACK+DECKER BM3B is a reliable alternative to some of the pricier options we came across. Even better, the BM3B does not suffer from some of the durability issues that other budget deep cycle battery chargers sometimes do.

The BM3B provides further benefit by being able to charge 12V as well as 6V batteries, which is excellent if you use a 6V array to save a bit on battery costs. On top of that, the BM3B charger is also easy to use with a plug and play design and a single switch to toggle between 12V or 6V.

The BM3B can charge your dead battery with O-rings or alligator clips, though it delivers one of the smaller currents and takes a bit longer to charge batteries than most of the other products we encountered. You also need to protect the BM3B from the elements as it is not weather resistant, though it does come with a built-in mounting bracket.

  • PROs

    • Is a less expensive
    • Can charge 6V batteries
    • Has two types of connectors
    • Is easy to use
  • CONs

    • Is a slower to charge
    • Is not weather-resistant

Bottom-Line: If you need an inexpensive product and are not in a rush, the BLACK+DECKER BM3B is easy to use and works with many different batteries.

BatteryMINDer Model 1500: 12V 1.5 AMP

Best Parallel Smart Charger

BatteryMINDer 1500: 12 Volt-1.5 AMP Battery Charger, Battery Maintainer, and Battery Desulfator with SmartTECHnology – Designed for Cars, Trucks, Boats, Motorcycles, Snowmobiles, Jet Skis, Golf Carts
  • FEATURING SMARTECHNOLOGY – Model 1500 features a SmarTECHnology plug’n run 1.5 AMP battery charger/maintainer with full-time automatic high frequency pulse desulfator.
  • EXTENDED BATTERY LIFE – Automatic full time desulfator reverses sulfation (a buildup of lead sulfate crystals) the primary cause of early battery failure by using a patented range of high frequencies to safely remove sulfation and recondition weak batteries. Sulfated batteries once considered beyond recovery can now be brought back to long-term useful condition. Extending battery life up to four times when compared to new batteries not being properly maintained.
  • AMBIENT TEMPERATURE SENSOR – Installed temperature compensation precisely adjusts battery voltage based on temperature sensor readings. This ensures your battery will always be properly charged and maintained no matter what conditions it is subject to. Reverse polarity, short-circuit and over temperature protection.
  • WORKS WITH A VARIETY OF BATTERY TYPES – Flooded, sealed, maintenance-free starter, deep cycle, Optima brand sealed AGM, and marine batteries. Model 1500 can maintain up to four batteries at a time when connected in parallel. Requires the use of Y-Connectors 27879 or 18ga (sold separately). Ideal for winterizing Cars, Trucks, Motorcycles, ATV, Boat, etc. The 90-240V AC 47-63 Hz input allows for worldwide use.
  • FCC CERTIFIED – Certified by the California Energy Commission as meeting the current efficiency standards, which means it meets strict energy efficiency guidelines set by the US Environmental Protection Agency and the Department of Energy.

While some RVs may only require a single deep cycle battery to run a couple of appliances or devices, others require a larger battery array. This is where the BatteryMINDer 1500 comes in handy as it can juice up to 4 deep cycle batteries wired in parallel better than most we came across with an additional adapter.

Part of this is thanks to the BatteryMINDer’s SmarTECHnology, which keeps track of the different discharge states and accommodates them automatically, making the BatteryMINDer easy to use. The 7-stage charging cycle also allows the BatteryMINDer to constantly desulfate and recondition the battery.

That said, the desulfination is not the best and works best with batteries already in decent condition. While the BatteryMINDer only charges 12V batteries, it can charge starter and hybrid batteries as well. However, when it comes to AGM deep cycle batteries, the BatteryMINDer can only charge Optima brand AGM batteries, so keep that in mind.

  • PROs

    • Is a less expensive product
    • Has 7-stage charging
    • Can maintain four parallel batteries
    • Comes with SmarTECHnology
  • CONs

    • Only charges 12V batteries
    • Not the best desulfination

Bottom-Line: When you have a large array of deep cycle batteries in decent condition, the BatteryMINDer will help keep them that way even if they are run in parallel.

Schumacher SC1300 1.5A 6/12V Fully Automatic Battery Maintainer

Best Deep Cycle 6V Charger

Schumacher SE-1-12S 1.5A 6/12V Fully Automatic Battery Maintainer
  • Specially designed for vehicles in storage and cold weather battery maintenance for motorcycle, power sport, and car batteries
  • Microprocessor controlled to automatically adjust the amperage rate to charge and maintain
  • Multi-stage charging for added precision, safety, and battery life
  • Features float-mode monitoring, reverse hook-up protection, and auto-voltage detection
  • Rugged molded plastic case resists gasoline, oil, water, solvents, and acid

While the Schumacher SC1300 is not the only product on our list that can recharge 6V batteries, it tends to perform better than its competitors. Not only does this allow you to charge a 6V deep cycle battery array, but the 1.5A current means you do not have to wait as long for the batteries to charge as you might with other inexpensive products.

You also do not have to worry about setting anything up as the Schumacher SC1300 features an automatic voltage detection function to determine the type of battery connected. Even better, the Schumacher SC1300 can be used in a wide variety of different environments with a rugged plastic case that is resistant to water, oil, gasoline, solvents, and acid.

On the downside, the Schumacher SC1300 is not meant to recondition a battery from a deep discharge cycle, nor does it desulfate the battery. You also need to disconnect the Schumacher SC1300 from your battery when not charging, as it will otherwise discharge the battery.

  • PROs

    • Is a less expensive product
    • Can charge 6V batteries
    • Is water-resistant
    • Is easy to use
  • CONs

    • Does not include alligator clamps
    • Discharges the battery when not plugged in

Bottom-Line: When you need to maintain a 6V array or even a 12V battery, the Schumacher SC1300 is easy to use, has a decent current flow, and houses much better than some of its competitors.

Optima Digital 400 12V

Best Deep Cycle Recovery Charger

Optima 150-40000 Digital 400 12V Performance Maintainer and Battery Charger
  • Automatically maximizes battery life and performance with a built-in battery health mode
  • Hybrid LED battery charging gauge with LCD display
  • Dual purpose hook and tilt stand design or hang it with the included wall organizer bracket
  • Works well as a marine battery charger, motorcycle battery charger, or other AGM battery charger.
  • Spark-free connection technology

The Optima Digital 400 not only provides a wide range of functions and versatility, but it also features one of the best displays we came across, containing all of the relevant information you might need. The screen itself uses a bright backlight LCD panel that provides the charging cycle, the battery’s charge capacity, the battery’s amp current, and the battery’s current voltage.

However, the Optima Digital 400 goes well beyond offering a great display with one of the best recovery modes we found, able to charge deeply discharged AGM batteries with as little as a 1.25V current. Beyond recovery, the Optima Digital 400 can juice a wide variety of different types of cells, including deep cycle, starter, and hybrids, with automatic monitoring features to keep track of the battery’s condition.

With all of these battery health and recovery features, it is a bit disappointing to see that the Optima Digital 400 does not desulfate batteries. Thankfully, the Optima Digital 400 charges quicker than most with a 4A current for large batteries and a 3A current for smaller ones.

  • PROs

    • Has an excellent display
    • Is easy to use
    • Has two types of connectors
    • Has numerous charging settings
  • CONs

    • Is a more expensive product
    • Does not work on sulfated batteries

Bottom-Line: When you drain your battery to its lowest point and you need this type of charger to bring it back to life, the Optima Digital 400 does so better than most while providing a detailed readout.

OptiMATE 6 12V-24V, TM-193, 8 step 5A 12V / 2.5A 24V

Best Deep Cycle Weather Resistant Charger

Tecmate TM-193 Battery Charger
  • The world’s most advanced 12V & 24V battery charger! OptiMate 6 12V-24V is perfect for high performance starter & deep cycle batteries that demand temp. controlled charging & long term maintenance!
  • SAVE: Low Volt Start of 0.5V (12V) + 1-step SAFE pulse recovery.; CHARGING AMPS : 5A @ 12V/2.5A @ 24V (Ampmatic).
  • Model TM-193 IDEAL FOR: STD, AGM & GEL 12V (batteries from 3 – 240Ah) | 24V (batteries from 1- 100Ah).
  • USE: Indoor/Outdoor (lowest temperature: -40°F/-40°C); STYLE : Weatherproof case with wall mounts, with 6ft/180cm AC supply lead and 6ft/180cm charge lead ending in SAE connector. Weatherproof battery lead & standard battery clip set included.
  • INPUT: Global (100-240V 50-60Hz), high efficiency (CEC listed), fully sealed.

Tecmate’s OptiMate 6 comes out of the gate as one of the most versatile products with regards to environmental conditions. For one, the OptiMATE 6 comes with a sealed case and waterproof lead to prevent issues connecting to the battery in poor conditions.

However, the OptiMATE 6 goes a step above and beyond by also functioning in the lowest temperatures that we found at – 40-degrees Celsius, which is 20-degrees lower than the next closest competitor. The OptiMATE 6 is also one of the few we came across that is safe for sensitive electronics like airplanes.

This product is also one of the few that we found, which features an 8-stage charging cycle, including charge tests both before and after charging. Finally, the OptiMATE 6 can charge 12V or 24V deep cycle batteries and can do so reasonably quickly with a current of 5A and 2.5A, respectively.

  • PROs

    • Can charge starter batteries
    • Safe for sensitive electronics
    • Has 8-stage charging
    • Has two types of connectors
  • CONs

    • More expensive
    • Has terrible customer service

Bottom-Line: While not the outright best we found, the OptiMATE 6 is certainly in the running with the broadest temperature ranges we saw and the ability to work with more sensitive electronics than most.

CTEK 40-206 MXS 5.0-12 Volt

Best Mid-Range Option

CTEK – 40-206 MXS 5.0 Fully Automatic 4.3 amp Battery Charger and Maintainer 12V
  • Unique reconditioning mode, built-in temperature sensing capabilities
  • Completely sealed Unit, spark proof and reverse – polarity protected
  • Premium input and output cable with robust strain relief
  • 5 year warranty. Ideal for start-stop systems
  • Input voltage 110-120 VAC

By far, one of the best features of the CTEK MXS 5.0 is its 8-stage charging cycle, which makes short work of a wide variety of different battery issues. This allows you to charge your battery as well as discover whether or not there is any serious issue without having to go to a professional.

On top of that, the CTEK MXS 5.0 also provides an IP65 waterproof housing, so you can use it pretty much anywhere without having to worry about the weather. Even better, the CTEK MXS 5.0 also sports a wide temperature range as well, able to function in temperatures as low as – 20-degrees Celsius.

The CTEK MXS 5.0 also offers a bit of unique versatility compared to many of the other models we reviewed by being able to recharge a calcium battery. The only real downside of the CTEK MXS 5.0 is that the battery must have a higher starting voltage before it begins charging.

  • PROs

    • Is IP65 waterproof
    • Has 8-stage charging
    • Can charge a wide variety of batteries
    • Has two types of connectors
  • CONs

    • Is a more expensive charger
    • Has a high minimum required voltage

Bottom-Line: While it is a bit more expensive than the “budget” options, the CTEK MXS 5.0 provides some of the best durability as well as easier use and broader versatility.

Last update on 2021-06-25 / Affiliate links / Images from Amazon Product Advertising API

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