AGM (absorbent glass mat) batteries have a lot of advantages over traditional batteries. Enhanced reliability, high performance even at low temperatures, and leakage resistance make it a perfect choice for many car owners.
However, you might need a special charger to maintain the AGM battery in top condition. But picking the best AGM battery chargers that would match your battery can be tricky. AGM batteries are sensitive to overcharging, so you will need a smart charger that would help you control the charging process without your direct involvement.
In this review, I will list the most popular options so that you can save time by eliminating the need for your research. Besides, I will cover the critical features when selecting the AGM battery charger if you want to go deeper into this topic.
|Name||Voltage||Charging current||Battery capacity||Weight||Review|
|NOCO GENIUS 5best overall||6V / 12V||5 A||120 Ah||1.6 lbs / 0.72 kg||Review|
|Battery Tender Juniorbudget||12 V||0,75 A||Not applicable||1 lbs / 0.45 kg||Review|
|NOCO GENIUS 10 most powerful||6V / 12V||10 A||230 Ah||4 lbs / 1.81 kg||Review|
Can I charge an AGM battery with a normal charger?
No, I am afraid you can’t charge an AGM battery with an ordinary charger without killing it. Why do AGM batteries need a special charger? The reason is that AGM batteries are more stable, and they require special charger parameters to maintain flawless battery operation after charging.
The peculiar feature of AGM battery chargers is that they operate slowly and on low voltage, and these are perfect conditions for AGM batteries.
Special chargers for AGM batteries have in-built microprocessors that estimate the battery level, capacity, and condition. Thanks to this, the smart device optimizes the charging experience to prevent overcharging. A conventional charger can easily overcharge the battery (and AGM batteries are sensitive to this) and kill it sooner than you expected.
Best AGM battery chargers reviews
NOCO GENIUS 5 – best overall
The NOCO GENIUS 5 is a universal charger that would cover a wide range of your charging needs, including recovering an AGM battery.
Regardless of its compact size, this model is powerful, energy-efficient, and high-performance. It is compatible with 12V AGM batteries but can also bring 6-volt and 12-volt lead-acid automotive, marine, and deep-cycle batteries to life. The charging current is 5A, and the output power is 75W max, which is sufficient for battery recovery.
Similar to NOCO GENIUS 10, the GENIUS 5 model has advanced diagnostics features that include high voltage level, battery condition, reverse connection, and unit temperature. But this model doesn’t support 6V AGM batteries, unlike a more advanced product of this brand.
The charger detects the battery charging needs and provides enough power without overcharging thanks to the thermal sensor. Even when the battery is dead, the NOCO GENIUS 5 will allow you to manually start charging even for the battery with 0 volts. But mind that it might take longer than the manual suggests to charge the battery.
This worry-free battery charger comes with an interchangeable connector, battery clamps, integrated eyelets, self-tapping screws, mounting bracket with strap, and a guide.
Being a multifunctional and powerful unit, the NOCO GENIUS 5 is the best AGM battery charger that offers the utmost functionality and flawless performance.
- Voltage, V : 6/12
- Charging current, A : 5
- Battery capacity, Ah : 120
- Output power, W : 75
- Weight, lbs/kg : 1.6 / 0.72
- Dimensions, inch/cm : 4.61 x 3.43 x 7.95 / 11.7 x 8.71 x 20.19
- Compatible with various batteries, including 12V AGM
- 5A charging current for faster charging
- 75W output power to cover various needs
- Advanced diagnostics features and worry-free charging control.
- Might charge longer than states in the guide.
Battery Tender Junior – budget
Recover your AGM battery without the risk of overcharging it with Battery Tender Junior.
This 12V charger and maintainer is compatible with gel, lead-acid, and AGM batteries. By offering 750mA of charging current, it charges and maintains motorcycles, dirt bikes, ATVs, UTVs, lawnmowers, and other tools. It also maintains cars, so it might not start your car when its battery is dead.
The unit comes with a 12-foot output cord, fused alligator clips, a fused ring terminal harness, and quick disconnect cables. It’s easy to use as the charger will automatically switch to a float mode to maintain the optimal battery level when it is fully charged.
Unlike the CTEK MXS 5.0 with more informative indicators, this product has only one two-color LED light that shows that the battery is charging and the voltage drops if it occurs. The charger is also enhanced with reverse polarity protection, so the battery is protected even if you confuse the power supply polarity.
The product is made in China, which has positively affected the price but killed the quality of the construction – the maintainer feels flimsy and poorly built.
Overall, the 750mA Battery Tender Junior is a worthy budget-friendly option if you are looking for a unit to maintain your car’s battery in top condition.
- Voltage, V : 12
- Charging current, A : 0,75
- Weight, lbs/kg : 1 / 0.45
- Dimensions, inch/cm : 8 x 4 x 9 / 20.32 x 10.16 x 22.86
- Great for maintaining fully charged car batteries
- Compatible with 12V AGM batteries
- Automatically switches to float mode once fully charged.
- It’s a car battery maintainer, so it won’t charge the dead battery.
- Low construction quality.
NOCO GENIUS 10 – most powerful
The advanced NOCO GENIUS 10 charger comes with numerous outstanding features catered to various charging needs and battery types.
Compared to the similar product in the line – NOCO GENIUS 5 with 5 Amps charging current, 120 Ah battery capacity, and 75 W output power, the NOCO GENIUS 10 can be called a true beast. It provides 10A of charging current and 150W of output energy, which results in faster charging and more stable performance. It is also capable of fully recovering the batteries with up to 230 Ah through both 6V and 12V AGM modes.
The pack includes the charger/maintainer, two self-tapping screws, battery clamps, mounting bracket, and strap.
Enjoy worry-free and precise charging due to a smart control feature. It will automatically assess the condition of the battery and its capacity. It will handle even a dead battery with one or fewer volts left.
The charger itself is compact, so you can also grab it with you in the trunk. But because this charger is too powerful, I noticed that the AGM battery gets really hot during recharging.
The NOCO GENIUS 10 boasted of nice-to-have parameters, making it applicable for a wide range of vehicles. But its main perk is the power, making it a good charger for AGM batteries that covers various needs.
- Voltage, V : 6/12
- Charging current, A : 10
- Battery capacity, Ah : 230
- Output power, W : 150
- Weight, lbs/kg : 4 / 1.81
- Dimensions, inch/cm : 4.41 x 4.48 x 9.1 / 11.2 x 11.37 x 23.11
- Compatible with 6V and 12V AGM batteries
- 10 Amps of charging current for faster use
- 150W of output energy for advanced power
- Fully charges 230 Ah batteries.
- Some batteries get too hot while charging.
CTEK MXS 5.0
The CTEK MXS 5.0 is a popular product of a famous Swedish brand manufacturing battery maintainers and chargers.
This smart charger is applicable for batteries up to 110 Ah, so it can recover the battery of the car, motorcycle, boat, and more. At the same time, it works for maintaining 160 Ah batteries. It supports 12V AGM and EFB batteries and supports 14.4/14.7/15.8V. The device generates 4.3A charging current for optimal charging speed.
Similar to Schumacher SC1281, the CTEK MXS 5.0 features a multi-step charging program for enhanced precision, safety, and battery life. Besides, it is a fully automatic microprocessor that controls the charging process and switches between several charging modes for advanced efficiency.
Thanks to the desulfation feature, you can remove sulfates from the lead plates and prolong the battery service life.
The pack includes the charger, extension cable, clamps, and indicator eyelet. There is also a carry bag for easy storage. There is no screen that shows you what is going on with the battery and the charger, but it has some indicators that might give some hints.
The CTEK MXS 5.0 is a reliable AGM battery charger and maintainer that would extract enough power to charge your battery when it requires maintenance and recharge.
- Voltage, V : 12
- Charging current, A : 4.3
- Battery capacity, Ah : 160
- Weight, lbs/kg : 1.8 / 0.81
- Dimensions, inch/cm : 11.02 x 5.91 x 2.36 / 28 x 15 x 6
- Complete charging cycle for batteries up to 110 Ah and maintenance for 160 Ah batteries
- 14.4/14.7/15.8V current with 8-step charging
- Smart microprocessor for care-free and safe charging.
- Indicators might not be informative enough.
Being specially designed for large batteries, SUVs, or trucks, this Schumacher SC1281 with 62A charge will help you get the standard, AGM, gel, and deep-cycle battery to life.
This is a 6V/12V model with 30 Amps quick boost and 100 Amps jumpstart to recover even fully discharged batteries. Being safe and reliable, it comes with a reverse hook-up protection that won’t let you start the charger if the clamps are connected reverse. Due to smart microprocessors that distribute the current depending on the battery condition, this unit might be your connect-and-forget solution.
In contrast to CTEK MXS 5.0, this unit is a little bulkier due to added features like advanced indicators and the LED screen. You’ll be able to see the charging mode, battery type, rate selection, the condition of the battery, and the charging progress.
The charger has a battery and alternator testing feature to help you spot electrical issues (you’ll see them on the panel). There is also a convenient start/stop button for ease of use.
Sometimes, the device won’t stop charging the battery, and the screen will freeze at a certain battery level (like 61% for a couple of hours).
This 6V and 12V AGM battery charger by Schumacher is a powerhouse charger that would handle large batteries like in trucks, SUVs, and other vehicles.
- Voltage, V : 6/12
- Charging current, A : 4
- Weight, lbs/kg : 12.7 / 5.73
- Dimensions, inch/cm : 11 x 10 x 8 / 27.94 x 25.4 x 20.32
- Informative and detailed panel and LCD screen
- Compatible with 6/12V AGM batteries
- Up to 100 Amps of charge current (varies on the mode).
- There might be issues with the information accuracy on the screen while charging.
AGM battery chargers buying guide
Using a random battery charger for AGM batteries that is not compatible with the battery can kill it. Check the voltage parameters of your battery and then look for the charger with the same characteristics. Usually, the batteries operate at 6V to 12V, but you might have a 24V item as well. The charger should produce a current limit 20% higher than the battery capacity, meaning that the maintainer should provide 14.4-14.8V for the 12V AGM battery.
Amperage rating of AGM charger
The ampere rating is responsible for the speed of AGM battery charging. AGM batteries require slow and long charging for long service life, so it is better to get the AGM battery maintainer with an average ampere rating (between 2 to 10 amps). Chargers with higher amperage will charge the battery faster, but they produce a lot of heat, which might cut the lifespan of your battery.
AGM battery chargers safety features
More advanced AGM smart battery charger options come with features that ensure safer charging and longer battery life. For example, the unit with the desulfation mode will prevent the lead sulfate build-ups during discharge, which will ensure a longer battery lifespan and higher efficiency. Smart chargers also monitor the condition of the battery during all charging stages. Thus, they adapt the charging process based on the battery capacity and state. If you are looking for charging customization, consider the device with an advanced microprocessor.