Buyer's Guide & Information

Best AGM Battery Chargers Reviewed

We have reviewed and compared the best AGM battery chargers on the market. These brands charge deep cycle AGM batteries of all sizes and uses.

The absorbed glass mat, AGM battery is different than a typical lead-acid battery. For this reason, you want the best AGM battery charger to keep the batteries running as they should. We will perform a comprehensive best AGM battery charger review so that you can find the model that suits your vehicle.


Preview

Product

Output

Operating Temperature

Check Price

NOCO Genius GENM3, 3-Bank, 12-Amp (4-Amp Per...

NOCO Genius

GENM3

3 banks @ 4A

32° to 104°F

CTEK (56-353) MULTI US 7002 12-Volt Battery...

CTEK (56-353)

MULTI US 7002

15.7V

-4° to 122°F

Optima Digital 1200 12V Performance Battery...

Optima Digital

1200

12A

unknown

CTEK - 40-206 MXS 5.0 Fully Automatic 4.3 amp...

CTEK

40-206 MXS

4A

-4° to 122°F

NOCO Genius G3500 6V/12V 3.5 Amp Battery...

NOCO Genius

G3500

3.5A

0° to 140°F

Schumacher SC1281 100 Amp 30 Amp 6V/12V Fully...

Schumacher

SC1281

15.8V

0° to 140°F

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

BatteryMINDer

128CEC1

2/4/8A

0° to 130°F


AGM Battery Chargers & Their Benefits

There are numerous benefits to owning the best AGM car battery charger. By attaching the cables of your AGM battery charger, you lessen the chance of needing a new battery. You can also charge the battery without ever taking it out of the vehicle.

However, you must buy a specialized 12 volt AGM battery charger. Otherwise, you could cause damage to your AGM battery. Don’t attempt to use a traditional charger with your AGM battery.


Choosing a High Quality AGM Battery Charger

Usage/Frequency

As you look at the best battery charger for AGM, you must first decide whether or not you will be using it at home or on the go. If you plan to take it with you, it's possible that you might need to use it during inclement weather, and you want a lightweight, portable option.

Battery Charger Features

  • Battery Type
    The maintainer won’t recharge a completely dead battery, but it is vital to use for long-term charging. For most people, it makes sense to purchase a battery charger instead. This will work with a depleted battery and helps to maintain the charge as well. Finally, you can choose a battery restorer, which is helpful with battery reconditioning.
  • Compatibility
    To avoid damage to your vehicle battery, you want to choose a compatible unit. If you attempt to use the conventional lead-acid battery charger on your AGM battery, you could cause damage. Instead, your battery charger should state that it works with AGM batteries.
  • Discharge Rating
    The depth of discharge relates to the percentage of battery capacity that is discharged in comparison to the maximum capacity. Discharge rates of eighty percent are considered deep discharge.
  • Durability & Versatility
    To produce the best value, you want a battery charger that works on a multitude of vehicles. Also, pay attention to the strength of the construction. It’s vital to have a charger that is resistant to damage from the weather and use.
  • Charger Size & Power
    How long do you want to be charging your AGM batteries? The more power it provides, the less time you spend charging, but you can’t use a charger that’s incompatible with the batteries. You want to follow the AGM battery charging voltage requirements. Marine Know How provides beneficial AGM battery charge voltage charts for your reference. In addition, look for a charger with starting/crank assist features to jump-start a dead battery.

Safety Features

  • Reverse Polarity Alarm 
    The reverse polarity alarm signals when the negative and positive connections are reversed. With this protection, you can’t hook up the charger incorrectly. 
  • Spark Proof Clamps
    The materials used in these clamps ensure that the user doesn’t experience any sparking during operation. With this protection, there’s less of a chance of injury.
  • Clamp Amps
    The clamp amps on your battery charger must be able to handle the power traveling to and from the battery. If not, you could face injury or damage to the car battery.
  • Battery Tester
    You don’t simply want to use your 12v AGM battery charger to add power to the battery, but it’s also helpful to test the condition. With this information, you know whether or not it is time to purchase a new battery.
  • Float Mode 
    Float mode ensures that the battery is maintained at the appropriate charge levels. When the battery reaches full capacity, the charger automatically switches to float mode to keep it topped off without damaging the battery.
  • Short Circuit Protection 
    Battery chargers can easily short circuit if any metal touches the clamps or the connections come in contact. With this protection, you have less of a chance of harming the battery or the charger.

Price & Warranty

While we all want the best 12V AGM deep cycle battery charger for the lowest price, we can’t always choose the lowest cost item. Instead, we want to choose from a reliable brand that also offers a lengthy warranty for optimal protection.


7 Best AGM Battery Chargers Reviewed

1. NOCO Genius GENM3

Our Top Pick!

Amperage

12A

Nominal Voltage

12V

Output

3 banks @ 4A

Operating Temperature

32° to 104°F

Weight

8.6 lbs

Warranty

5-year

This 12-amp battery charger will work on three 12-volt batteries at the same time, by providing four amps per bank. You can use it on a variety of batteries, including AGM, wet, gel, and deep-cycle models. In addition, this charger comes with a variety of safety features that keep you protected. With the spark-proof technology, thermal protection, reverse polarity protection, ignition protection, and overcharge protection, there's little to worry about during operation.

This battery charger also has a waterproof case that can be submerged in water without damage. With this durability, it’s safe to use the charger anywhere. The company also provides several other options, including a 1-bank 10-amp charger, 1-bank 4-amp charger, 2-bank 8-amp charger, and the 3-bank 30-amp charger. The best part about working with any of these chargers is the 5-year warranty offered by the company. There’s virtually no downside to using any one of these AGM charger options.

Pros

  • Numerous options to choose from
  • Waterproof case
  • Highly rated
  • 5-year warranty

Cons

  • None

2. CTEK (56-353) MULTI US 7002

Best Low Amp AGM Battery Charger

Amperage

7A

Nominal Voltage

12V

Output

15.7V

Operating Temperature

-4° to 122°F

Weight

1.76 lbs

Warranty

5-year

Another option for your AGM batteries is this CTEK model. The kit comes with a charger, eyelets, two interchangeable connection leads, and clamps. The eight-step automatic switch charging includes four separate charging modes that work together in harmony to provide no-watch, convenient charging. With this charger, you can power up your wet, gel, and AGM batteries. Use it from 14Ah to 150Ah to provide charging or 14Ah to 225Ah for maintenance purposes.

In addition, the patented desulphation functionality allows for additional recovery if your AGM battery cells need restoration. Most owners are pleased with the compact, portable design that also includes mounting holes for a permanent assembly. There are no negatives to using this charger that we can see. Plus, the company provides a lengthy five-year warranty for additional peace of mind. Carry this lightweight charger everywhere with you, so that you are never without the vital power needed to travel.

Pros

  • Portable design
  • Charges and maintains
  • Highly rated
  • 5-year warranty

Cons

  • None

3. Optima Digital 1200

Best Marine AGM Battery Charger

Amperage

12A

Nominal Voltage

12V

Output

12A

Operating Temperature

unknown

Weight

7.75 lbs

Warranty

3-year

What makes the Optima Digital charger different is that this will work down to 1.25V, thereby charging some batteries that other units will not. The integrated charging clamp LED light is also attached for maximum versatility. With the LCD battery charging gauge, you can rely on the easy operation in any situation. Furthermore, this model includes a handy USB charging port that will provide power to your tablet, camera, or smartphone.

If you don’t need so much capability or as many options, you might prefer the Optima Digital 400 instead. It’s available at a lower price and provides just as much reliability. While the reviews are off the charts, some people have complained that the charger doesn’t automatically switch to maintenance mode every time. However, the company does provide a three-year warranty, which should be plenty of time to determine if your charger has a problem that requires a replacement or repair.

Pros

  • Digital display
  • Charges other devices
  • Highly rated
  • LED light

Cons

  • Occasional maintenance mode malfunction

4. CTEK 40-206 MXS

Best AGM Motorcycle Battery Charger

Amperage

4A

Nominal Voltage

12V

Output

4A

Operating Temperature

-4° to 122°F

Weight

1.8 lbs

Warranty

5-year

Do you need a portable motorcycle battery charger? You might prefer this lightweight option from CTEK. This particular model comes with a unique reconditioning mode and built-in temperature sensing capability. Because it is completely sealed, you don’t have to worry about durability either. You can also count on the spark-proof and reverse-polarity protection features that keep every operator safe. The MXS 5.0 utilizes an eight-step approach to taking care of the batteries.

Along with this battery charger, there are several other options to choose from. The company even offers a pink model if you prefer something more feminine. There’s even an entire kit that might be useful if you want some additional accessories.

Overall, the reviews can’t get much better. However, there are a few customers that have complained about the durability of the clamps. When you factor in the price and the included five-year warranty, it’s difficult to avoid the value that is offered versus the potential of a small defect.

Pros

  • Lightweight
  • Charges multiple types of batteries
  • Highly rated
  • 5-year warranty

Cons

  • Poor quality clamps

5. NOCO Genius G3500

Best AGM Battery Charger Maintainer

Amperage

3.5A

Nominal Voltage

6V/12V

Output

3.5A

Operating Temperature

0° to 140°F

Weight

2.09 lbs

Warranty

5-year

There's no reason to pay more than necessary for a battery maintainer when you have this NOCO option. This all-in-one battery charger is ideal for cars, trucks, boats, RVs, and more. You can use it with anything that requires up to 120Ah. With this charger, you ensure that all of your vehicles have the power needed to get you from Point A to Point B. It's also a great option for year-round maintenance or long-term vehicle storage. Use it with a variety of 6- and 12-volt batteries, including AGM, deep-cycle, or wet.

The advanced Repair Mode will also help to reverse the effects of damaged cells to improve longevity. In addition, the internal BMS will effectively charge lithium-ion batteries for enhanced operations. This system doesn't lack any safety features either. It includes spark-proof technology, as well as reverse polarity protection. While the company does provide a five-year warranty, not everyone has been happy with the process of getting coverage.

Pros

  • Unique repair mode
  • Works with lithium-ion batteries
  • Superior reviews
  • 5-year warranty

Cons

  • Lengthy warranty process

6. Schumacher SC1281

Best Charger for AGM Deep Cycle Battery

Amperage

30/100A

Nominal Voltage

6V/12V

Output

15.8V

Operating Temperature

0° to 140°F

Weight

12.65 lbs

Warranty

2-year

This exceptional AGM deep cycle battery charger from Schumacher offers much more than the other choices. Not only will it charge the batteries, but it also provides a quick boost and jump start function for dead batteries. The model also includes a battery and alternator tester to diagnose any potential problems you might face. As far as safety features are concerned, you will have everything you need. It comes with multi-stage charging, reverse hook-up protection, plus auto-voltage detection.

You can use this sophisticated charger with a variety of battery types, including deep-cycle, AGM, gel, and traditional wet-cell. There are also several other options if you prefer something different. Some of the kits even include some accessories, such as a cleaning brush. This is a more substantial model than some of the portable options listed above, but the added weight comes with jump-starting ability. Plus, the company offers a two-year warranty, which further seems to boost the reviews from customers.

Pros

  • Jump starts batteries
  • Many safety features
  • Excellent reviews
  • Multi-stage charging

Cons

  • Heavier than other options

7. BatteryMINDer 128CEC1

Best AGM Battery Charger for Simultaneous Charging

Amperage

2/4/8A

Nominal Voltage

12V

Output

2/4/8A

Operating Temperature

0° to 130°F

Weight

3.2 lbs

Warranty

5-year

If you own a shop or want to charge many batteries at once, you will love this option from BatteryMINDer. It provides the ability to maintain eight batteries at once. However, you will need to purchase Y-connectors to make it work. This maintainer also features an ambient temperature sensor to adjust the battery voltage quickly and effectively. Furthermore, it contains short-circuit protection, over temperature protection, and reverse polarity safety features.

This battery charger includes a full-time desulfator that reverses the buildup of lead sulfate in the batteries. With this function, you can count on longer battery lives. Pick from the 2-, 4- or 8-amp settings depending on what type of battery you are charging.

It's recommended to use the 8-amp setting on an AGM battery. Overall, you can't ask for more with the price and superior customer reviews. However, the company is happy to go above and beyond by providing a five-year warranty, which appears to be the most extended term in the industry.

Pros

  • Works on eight batteries
  • Numerous safety features
  • Highly rated
  • 5-year warranty

Cons

  • Need additional equipment for simultaneous charging

Type of AGM Battery Chargers

  • Maintainer 
    The AGM battery maintainer keeps the charge where it should be. It doesn’t restore the dead cells or fully charge the battery, but it ensures that the charge is not lost over time. It’s easy to leave the battery maintainer hooked to the vehicle all day to ensure you are never without reliable transportation again.
  • Charger 
    Most people prefer an AGM battery charger. This device does precisely what it says. These chargers will restore life back into the battery after the power has been drained. With the proper amount of voltage and amperage, you can quickly recharge your battery when it fails to provide the power you need.
  • Restorer 
    The battery restorer isn’t as common, but it has a purpose. The restorer breaks down contaminants that have built up in the cells. With this function, you can restore the battery capacity. Most often, battery restorers are found in heavy-duty shops, mechanic garages, and DIY workshops. These are the most expensive option of the three. 

Using and Testing AGM Battery Chargers

It’s never wise to charge an AGM battery with a standard charger. Instead, you want to use an AGM battery charger. If you don’t know how to charge an AGM battery, read the instructions found with your charger. You can also follow these basic steps.

  1. 1
    Connect the battery charger, starting with the positive terminal.
  2. 2
    Set the power settings and turn the charger on.
  3. 3
    Watch the battery levels and remove the charger once it has reached full capacity.

Here is a helpful video if you need detailed visual instructions:

If you are unsure whether or not your car batteries or the charger are dead, you want to test the functionality of your charger. This is a simple task that only requires a voltmeter. Also, if you plan to recondition the dead battery, you will want an AGM battery restorer to perform this operation safely.


Care & Maintenance of Chargers

If you want your 36 volt AGM battery charger to last as long as possible, there are several ways to ensure a longer life.

  • Keep the charger in a dry location when not in use.
  • Never touch the positive and negative connections to one another.
  • Avoid touching any metal with the clamps.
  • Stop charging if you notice any defects to the battery.

People Also Ask (FAQs)

Do you need a special charger for AGM batteries?

AGM vs. standard battery charging are two different practices. For this reason, you need a specialized AGM charger to work with your battery. Because the AGM battery prefers a slower charger, you could cause damage by overcharging with traditional equipment.

What happens if you charge an AGM battery with a standard charger?

You can easily overcharge the AGM battery cells and cause permanent damage.

Will an alternator charge an AGM battery? Can I use a trickle charger on an AGM battery?

The alternator doesn't charge the car battery but instead helps to maintain it. The best way to ensure you get the power you need is to use a specialized AGM battery charger. You can also use an AGM battery trickle charger to maintain the appropriate levels.

What is the difference between gel and AGM batteries?

Both of these are considered maintenance-free batteries, but the most significant difference is the charge rate. AGM batteries will handle a higher charge and discharge rates. Because of the slower discharge rates, gel batteries often cost more and are ideal for solar configurations.

How do I know when my AGM battery is fully charged?

Each battery requires a specific amount of time to charge fully. However, the more discharged it is, the longer it takes to recharge. It could take your battery between two and 12 hours to fully charge. Watch the levels on your battery charger to determine when it is full.

What are the best rated AGM battery charger brands?

Whether you want an RV AGM battery charger or a top marine AGM battery charger, you want to choose an option from the best brands. We have found that BatteryMINDer, CTEK, Schumacher, and NOCO provide the top-rated chargers on the market.

How do I clean the battery terminals?

If you notice any corrosion on the terminals or connections, you can mix distilled water with baking soda to create a paste. Apply this paste to the affected areas and clean with an old toothbrush. Make sure you wear gloves to protect your skin from irritation.


Conclusion

If you want to charge numerous batteries at once, we highly recommend the NOCO Genius GENM3. It comes with some of the best reviews and features a reasonable price. With this AGM charger, there’s no reason to deal with a dead battery again.

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