Best AGM Battery Chargers Reviewed

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.

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

Safety Features

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.

1. NOCO Genius GENM3

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.

2. CTEK (56-353) MULTI US 7002

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.

3. Optima Digital 1200

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.

4. CTEK 40-206 MXS

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.

5. NOCO Genius G3500

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.

6. Schumacher SC1281

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.

7. BatteryMINDer 128CEC1

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.

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.

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.

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.