NOCO GENIUS2D: 2A 12V Smart Onboard Battery Charger - Direct-Mount Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid Batteries, Battery Chargers

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NOCO GENIUS2D: 2A 12V Smart Onboard Battery Charger - Direct-Mount Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid Batteries

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Brand	NOCO
Colour	Black
Product Dimensions	8.8D x 8.7W x 16.5H Centimetres
Item weight	227 g
Output voltage	12 Volts
Specification met	CSA, UL, FCC
Input voltage	120 Volts
Charging time	40 Hours
Current rating	2 Amps
Global Trade Identification Number	00046221180138

About this item

MEET THE GENIUS2D — A direct-mount onboard battery charger for an under-the-hood battery charging. It's the all-in-one charging solution - battery charger, battery maintainer, trickle charger, plus desulfator.
DO MORE WITH GENIUS — Designed for 12-volt lead-acid (AGM, Gel, SLA, VRLA) batteries, including flooded, maintenance-free, deep-cycle, marine and RV batteries.
DIRECT MOUNT — Securely attaches near the battery using a durable snap-fit mounting bracket and installs easily into most surfaces with truss-head self-tapping screws for a hassle-free, reliable setup.
ENJOY PRECISION CHARGING — An integrated thermal sensor dynamically adjusts the charge based on ambient temperature, preventing overcharging in hot weather and undercharging in cold, ensuring optimal battery performance.
CHARGE DEAD BATTERIES — Charge batteries from as low as 1 volt, or use Force Mode to manually charge completely dead batteries down to zero volts. Perfect for recovering deeply discharged or neglected batteries.
BEYOND MAINTENANCE — Keep your battery fully charged without worrying about overcharging. Our smart charger constantly monitors the battery, allowing you to leave it connected safely - indefinitely - for worry-free maintenance.
RESTORE YOUR BATTERY — Precision pulse charging automatically detects and reverses battery sulfation and acid stratification, restoring your battery's health for improved performance and extended lifespan.
WHAT'S IN THE BOX — Includes a 2A onboard charger, 24-inch AC cable, 24-inch DC cable with eyelet terminals, mounting bracket, screws, and a 3-year warranty. Proudly designed in the USA.

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This item: NOCO GENIUS2D: 2A 12V Smart Onboard Battery Charger - Direct-Mount Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid Batteries

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NOCO GENIUS2: 2A 6V/12V Smart Battery Charger – Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium Batteries

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NOCO GENIUS5: 5A 6V/12V Smart Battery Charger – Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium Batteries

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NOCO GENIUS2: 2A 6V/12V Smart Battery Charger – Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium Batteries

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NOCO Genius GEN5X1: 1-Bank, 5A Onboard Battery Charger - 5A Per Bank, 12V Waterproof Marine Charger with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium Batteries

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NOCO GENIUS1: 1A 6V/12V Smart Battery Charger – Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium Batteries

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NOCO GC002 X-Connect M6 Eyelet Terminal Accessory for NOCO Genius Smart Battery Chargers

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NOCO GENIUS2X2: 4A 2-Bank Smart Battery Charger (2A/Bank) - 6V/12V Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium

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Established in 1914, NOCO designs and creates premium consumer battery chargers, jump starters, lithium batteries, and a wide range of accessories. Through these world-class offerings, we have effectively set a new standard in design, performance, and safety. We aim to make exceptional products that provide consumers with the ultimate experience. We challenge conventionality and remain vigilant to the highest quality standards. We are NOCO.

From the manufacturer

GENIUS2D, GENIUS, NOCO, Direct mount Chargers, Battery Charger, Chargers, Charger

SECURE BRACKET.

Use a drill to secure the mounting bracket using self-tapping screws (included).

ATTACH STRAP.

Loop the velcro mounting strap into the mounting bracket.

MOUNT GENIUS2D.

Clip the Genius 2D charger into the mounting bracket.

FASTEN STRAP.

Fasten the Genius 2D charger using the velcro mounting strap.

	GENIUS2D	GENIUS1	GENIUS2	GENIUS5	GENIUS10
Customer Reviews	9,419	53,856	16,404	18,392	18,343
Charging Current	2 Amps	1 Amp	2 Amps	5 Amps	10 Amps
Battery Capacity	40Ah	30Ah	40Ah	120Ah	230Ah
Output Power	28W	15W	30W	75W	150W
12V Repair Mode	✘	✘	✘	✔	✔
12V Supply Mode	✘	✘	✘	✘	✔
6V AGM Mode	✘	✘	✘	✘	✔

Product description

The GENIUS2D is the ultimate direct-mount onboard battery charger, designed for under-the-hood charging. It acts as a battery charger, maintainer, trickle charger, and desulfator, making it the perfect solution for 12-volt lead-acid batteries (up to 40 amp-hours), including AGM, gel, SLA, VRLA, flooded, maintenance-free, deep-cycle, marine, and RV applications. It is compatible with a vast array of vehicles, such as cars, automobiles, lawn mowers, ATVs, UTVs, tractors, trucks, SUVs, RVs, campers, trailers, boats, pickups, classic cars,��and more, including automotive brands like BMW, Mercedes-Benz, Porsche, Bentley, Maserati, Lexus, Audi, Ford, Chevrolet, Corvette, Cadillac, Prius, Toyota, Subaru, Nissan as well as lawn and garden vehicles such as John Deere, Kubota, Toro and more. With its rugged snap-fit mounting bracket and truss-head self-tapping screws, installation is secure and effortless on most surfaces. The GENIUS2D can charge batteries as low as 1 volt and even offers Force Mode to manually charge completely dead batteries (as low as zero volts). Its advanced monitoring system keeps your battery fully charged without the risk of overcharging, while precision pulse charging reverses sulfation and acid stratification, restoring battery health and extending performance. The package includes a 2A onboard charger (120-240VAC), 24-inch AC and DC cables with eyelet terminals, a mounting bracket, screws, and is backed by a three-year warranty. Proudly designed in the USA, the GENIUS2D makes battery maintenance simple, reliable, and hassle-free.

Product information

Technical Details

Manufacturer	‎NOCO
Place of Business	‎NOCO, 30339 Diamond Parkway, #102, Glenwillow, OH 44139 USA
Brand	‎NOCO
Model	‎GENIUS2D
Product Dimensions	‎8.81 x 8.71 x 16.51 cm; 226.8 g
Item model number	‎GENIUS2D
Exterior	‎Machined
Manufacturer part number	‎GENIUS2D
Special features	‎Spark-Proof and Reverse Polarity Protection, Onboard Battery Charger For Under-The-Hood Applications, Battery Maintainer, Trickle Charger And Battery Desulfator, Temperature Compensation For Accurate Recharging, IP65 Ingress Protection
Amperage	‎2 Amps
Voltage	‎12 Volts
Item Weight	‎227 g
Country of origin	‎China

Additional Information

ASIN	B07W3QSMF9
Customer Reviews	9,419 ratings 4.6 out of 5 stars
�鶹�� Rank	#815 in Automotive (See Top 100 in Automotive) #13 in Battery Chargers
Date First Available	Aug. 20 2019

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	This Item NOCO GENIUS2D: 2A 12V Smart Onboard Battery Charger - Direct-Mount Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid Batteries	Recommendations NOCO Genius GEN5X2: 2-Bank, 10A Onboard Battery Charger - 5A Per Bank, 12V Waterproof Marine Charger with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium Batteries	�� NOCO Genius GENPRO10X1: 1-Bank, 10A Onboard Battery Charger - 10A Per Bank, 12V Waterproof Marine Charger with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium Batteries	�� ProMariner ProTechOne Digital Series 5 Amp Fully Automatic On-Board Battery Charger and Maintainer with Integrated AC Inlet, 24105,Black	�� Shell SBC400 1 Amp/4 Amp Automotive Battery Charger and Maintainer for Lead Acid, Gel, AGM, Li-on, Automatic 6V/12V Output with 7 Levels of Protection and 11-Stage Charging to Extend your Battery Life	�� NOCO Genius GEN5X1: 1-Bank, 5A Onboard Battery Charger - 5A Per Bank, 12V Waterproof Marine Charger with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium Batteries
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Price	-19%��$55.24 List: $68.50	$195.49	$222.43	$90.48	$59.98	$112.19
Delivery	Get it by Tuesday, Jul 1	Get it by Tuesday, Jul 1	Get it by Tuesday, Jul 1	Get it by Wednesday, Jul 2	Get it by Tuesday, Jul 1	Get it by Tuesday, Jul 1
Customer ratings	4.69,419	4.65,701	4.71,424	4.632	4.357	4.72,121
Sold by	�鶹��.ca	�鶹��.ca	�鶹��.ca	�鶹��.ca	Camelion North America	�鶹��.ca
output voltage	12 volts	12 volts	12 volts	5 volts	12 volts	12 volts
input voltage	120 volts	120 volts	120 volts	120 volts	12 volts	120 volts
battery charge time	40 hours	1 hours	1 hours	—	11 seconds	1 hours
specification met	UL	UL, CEC, RoHS	UL, CEC, RoHS	energy	—	—

Customer reviews

9,419 global ratings

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Customers say

Customers like the functionality, charging performance, and usability of the battery charger. They mention it works great when they need it in the winter, keeps their batteries fully charged at all times, and saves them time and effort. Customers also appreciate the compact size and mounting. However, some customers dislike the cord length and disagree on the weather resistance.

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Functionality Charging performance Usability Quality Compact size Mounting Weather resistance Cord length

177 customers mention "Functionality"161 positive16 negative

Customers like the functionality of the battery charger. They mention it works excellently when they need it in the winter, maintains batteries when the temperatures are low, and is an intelligent no-nonsense unit. Customers also say it's easy to install and a piece of mind knowing their vehicle isn't used.

"Friendly usable products, working great" Read more

"...Its intelligent charging capabilities, ease of installation, and overall performance make it an excellent choice for any car owner looking to extend..." Read more

"Super easy to install. Super easy to use. Piece of mind knowing your vehicle that isn’t used everyday will start when you turn the key." Read more

"Worked great for a stored car battery over the winter." Read more

165 customers mention "Charging performance"138 positive27 negative

Customers like the charging performance of the battery charger. They mention it keeps their pickup batteries charged during the winter time well, even in -40 degrees Celsius. They also mention it's perfect for short and long-term charging maintenance. Customers also say the product revives their dead batteries.

"...This is a great way to keep my battery alive longer and now that it's part of the car it will work for any other battery that's installed." Read more

"Awesome trickle charger" Read more

"Great battery charger and maintainer. Kept my pickup battery charged during the winter time well, even in -40c...." Read more

"...Its intelligent charging capabilities, ease of installation, and overall performance make it an excellent choice for any car owner looking to extend..." Read more

154 customers mention "Usability"141 positive13 negative

Customers like the usability of the battery charger. They mention it's fairly easy to install, plug-n-play, and manageable. Customers also say it saves them time and effort of having to charge their batteries between -35 C. They also say it's a simple little device.

"Friendly usable products, working great" Read more

"...Its intelligent charging capabilities, ease of installation, and overall performance make it an excellent choice for any car owner looking to extend..." Read more

"Super easy to install. Super easy to use. Piece of mind knowing your vehicle that isn’t used everyday will start when you turn the key." Read more

"...Was a simple install (I mounted it to the firewall - it is a sealed unit). The peace of mind is well worth it!..." Read more

122 customers mention "Quality"99 positive23 negative

Customers like the quality of the battery charger. They mention it's high-quality, reliable, and robust. Customers also say the terminal connectors are of good quality and the charger holds a solid 9 on the load test.

"...Direct-Mount Intelligent Onboard Battery Charger has proven to be a reliable and efficient tool for keeping my car's battery in optimal condition...." Read more

"...No more jump starts or battery worries. NOCO's build quality seems solid, and it's a great value for the price, with a good warranty...." Read more

"Very good product. Keeps your battery charged even if you don’t start your vehicle for 15+ days." Read more

"...More importantly, once plugged in, the NOCO did its thing, LED lights sequenced through charge status as they should...." Read more

60 customers mention "Compact size"51 positive9 negative

Customers like the compact size of the battery charger. They mention it fits neatly in the engine and charges the battery nicely. Some also say it's perfect for short and long-term charging maintenance.

"...The Noco Genius 2D did not disappoint. It was smaller and lighter than expected...." Read more

"...The unit small and light which makes it very easy to mount. I mounted it on the top of the windshield washer reservoir on my 2005 Expedition...." Read more

"...Easy to install and it does its job. It's so small that you can easily hide somewhere in the engine compartment of you vehicle...." Read more

"...The charger is compact and easily installs adjacent the vehicle battery...." Read more

23 customers mention "Mounting"20 positive3 negative

Customers like the mounting of the battery charger. They mention it mounts nicely on the firewall, is easy to mount just about anywhere, and the supplied fixation is very useful for carrying installation. Some say they were able to mount it next to the air filter and cleanly route the cables to the battery.

"This maintainer is perfect to mount next to the battery (in the trunk) for our Miata...." Read more

"...Thanks to its direct-mount design, I was able to install the NOCO GENIUS2D charger directly onto my car's battery...." Read more

"...Comes with a mount, fasteners, velcro strap and strong input and output strain relief features...." Read more

"...This maintainer was permanently mounted near the battery in conjunction with the block heater cord and does exactly what was expected from a 2amp..." Read more

47 customers mention "Weather resistance"27 positive20 negative

Customers have mixed opinions about the weather resistance of the battery charger. Some mention it has no issues with starting in cold weather, keeping it warm from the inside, and is paired with a block heater for winter use. However, others say it doesn't work in temperatures below -20C.

"...This keeps the battery warm and powered up for starting. Pros: Easy Installation: The installation process was a breeze...." Read more

"...it a few days ago (early March 2021) I noticed that the insulation on the power supply cord (carrying 115v INTO the unit) was cracked right through..." Read more

"...to anyone who wants to keep their battery healthy and avoid those frigid winter surprises!" Read more

"...A/C wire is plastic not rubber. Not made for Canadian winters." Read more

37 customers mention "Cord length"0 positive37 negative

Customers are dissatisfied with the cord length of the battery charger. They mention it's too short, the AC wire is only 2 feet long, and the leads need to be longer so you have some flexibility in where to mount. Some also say the connectors won't fit on a car battery, the clip is too small to fit post, and the VW 6mm battery bolts don't fit.

"...Although the cords to battery and plug are short, the functions within this charger are robust and well-designed for winter lead-acid revitalization...." Read more

"Works like it should but needs longer 110/120V power cord. Wish its cord was 8" - 12" longer...." Read more

"...3 feet 110 V wire is too short...." Read more

"...to install and as said, limited installation options due to short cord length and including a cover for electric plug would be great." Read more

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Top reviews from Canada

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HenryL
Great maintainer
Reviewed in Canada on May 30, 2025
Verified Purchase

This maintainer is perfect to mount next to the battery (in the trunk) for our Miata. I used two-way tape to mount the bracket to the inside of the fender. It will be used during winter storage or during periods of the car not being driven to keep the battery conditioned.

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Akony
Noco makes superb products.
Reviewed in Canada on May 21, 2025
Verified Purchase
I bought this trickle charger because I'm driving less these days. Even if I change my battery once it goes bad, my new driving habits will shorten the service life. This is a great way to keep my battery alive longer and now that it's part of the car it will work for any other battery that's installed.

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Old-Timer
Plug it in and forget it (until you leave again)
Reviewed in Canada on June 20, 2025
Verified Purchase
Awesome trickle charger

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Steve R adams
Recommend
Reviewed in Canada on April 20, 2025
Verified Purchase
Friendly usable products, working great

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�鶹�� Customer
Good reliable product
Reviewed in Canada on May 25, 2025
Verified Purchase
Great battery charger and maintainer. Kept my pickup battery charged during the winter time well, even in -40c. Never had to idle it,even when I left sitting for a couple days. Will buy another one for the other vehicle to. Worth every penny!

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Jami Taschuk
Keeps my batter full power for cold Canadian winters.
Reviewed in Canada on July 3, 2023
Verified Purchase
As an avid car enthusiast, maintaining the health and longevity of my vehicle's battery is of utmost importance to me. The NOCO GENIUS2D 2A Direct-Mount Intelligent Onboard Battery Charger has been an absolute game-changer in ensuring that my car battery stays charged and ready to go at all times. This intelligent onboard battery charger is specifically designed for 12V car batteries, and after using it for a while, I can confidently say that it is a fantastic investment for any car owner.
lug in

I live in Canada and we have cold winters where we need block heater to keep the engine warm in -30F nights. I Use a double plug-in and have both block heather and charger powered. This keeps the battery warm and powered up for starting.

Pros:

Easy Installation: The installation process was a breeze. Thanks to its direct-mount design, I was able to install the NOCO GENIUS2D charger directly onto my car's battery. The package came with clear instructions, and the whole process took only a few minutes.

Intelligent Charging: One of the standout features of this charger is its intelligence. The GENIUS2D is equipped with an advanced microprocessor that constantly monitors the battery's status and adapts the charging process accordingly. This ensures efficient charging, prevents overcharging, and helps extend the battery's lifespan.

Multi-Stage Charging: The charger utilizes a multi-stage charging process, which is excellent for battery maintenance. It starts with a gentle trickle charge to bring the battery up to a suitable voltage, then switches to a bulk charge phase, and finally, a maintenance phase that keeps the battery at an optimal level.
Versatility: While I primarily use it for my car, the GENIUS2D is also compatible with a wide range of other 12V lead-acid batteries, including marine batteries and deep-cycle batteries. This versatility is a huge plus, as it allows me to use it for other vehicles and equipment when needed.

Durable Build: The charger's build quality feels solid and durable. The rugged construction ensures that it can withstand the rigors of daily use and various environmental conditions.
Cons:

As with any product, there are a few minor drawbacks to consider:

Charging Speed: The NOCO GENIUS2D has a charging rate of 2 amps, which is sufficient for maintenance charging and ensuring the battery stays topped up. However, if you need to recharge a fully depleted battery quickly, you might need a charger with a higher amperage.

Mounting Location: While the direct-mount design is convenient, it might not be suitable for all vehicle types. Depending on the battery's location and the car's design, mounting it directly might be a challenge.
Conclusion:

The NOCO GENIUS2D 2A Direct-Mount Intelligent Onboard Battery Charger has proven to be a reliable and efficient tool for keeping my car's battery in optimal condition. Its intelligent charging capabilities, ease of installation, and overall performance make it an excellent choice for any car owner looking to extend the life of their 12V battery. Despite its slightly lower charging speed, the benefits it offers in battery maintenance far outweigh this minor limitation. I highly recommend the GENIUS2D for its top-notch quality and peace of mind it provides when it comes to the health of your vehicle's battery.

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C Dub
Awesome
Reviewed in Canada on May 18, 2025
Verified Purchase
Super easy to install. Super easy to use. Piece of mind knowing your vehicle that isn’t used everyday will start when you turn the key.

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graeme
Worked great
Reviewed in Canada on May 26, 2025
Verified Purchase
Worked great for a stored car battery over the winter.

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Red
Perfect to be mounted permanently.
Reviewed in the United States on June 12, 2025
Verified Purchase

This little charger is perfect for a permanent mount. The clip that attaches to it uses Velcro, but I'm hoping that the charger itself lasts long enough that I have to replace the fabric strap.

The cables are short, which is what you want for something like this. The cord is accessible when I want to plug it in using an extension cord, and it's out of the way when I'm not using it. I don't have to worry about it getting tangled up with the other wiring or straps.

I have it mounted next to the trailer battery on my RV. It is directly connected to the battery so it can trickle charge while the battery is disconnected from the rest of the trailer. This is handy because sometimes when a trailer sits around the battery just gets drained down. If I've been using the jack a lot and my truck hasn't been connected long enough enough to fully recharge it, I just connect it to the outlet on the side of my trailer and let it charge from there whether my trailer is getting power from a utility or generator.

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Luis gonzalez
Muy buen producto
Reviewed in Mexico on December 13, 2024
Verified Purchase
Casi no ocupo mi jetta A4 y lo instale
dentro del cofre y Lo tengo conectado con un enchufe inteligente que solo encienda por las noches y se apaga de día y cuando lo voy a ocupar enciende el carro sin ningún problema y así mantengo la batería en perfecto estado lo recomiendo

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Gerardo F.
Buen producto
Reviewed in Mexico on February 4, 2025
Verified Purchase
Muy buen producto

Gracias

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Ken S.
If you're hardwiring it in, you don't want a "cheap" charger, you want a good charger.
Reviewed in the United States on June 17, 2025
Verified Purchase
I own three of this exact model, and they've all been working perfectly for a couple years at this point. I have these wired into all of my vehicles which are driven only seasonally, and they've been great. When I park something that will be stationary for more than a month I just grab an extension cord, and plug the charger in, and then I have complete faith that the vehicle is going to re-start normally next time I want to use it. Even at full retail price for these, their ease of use and dependability makes them well worth the money being asked. I replaced too many cheap battery maintainers and batteries before I gave in and started buying name brand stuff, and I really wish I'd switched earlier. It doesn't take many failed automotive batteries caused by failed cheap chargers to vastly outweigh the price of just buying these good maintainers.

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MJ
Excelente aparato!
Reviewed in Mexico on February 8, 2024
Verified Purchase
Compacto, fácil de usar e instalar.

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NOCO GENIUS2D: 2A 12V Smart Onboard Battery Charger - Direct-Mount Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – for Lead-Acid Batteries

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From the manufacturer

SECURE BRACKET.

ATTACH STRAP.

MOUNT GENIUS2D.

FASTEN STRAP.

Product description

Product information

Technical Details

Additional Information

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Top reviews from Canada

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5.0 out of 5 stars Perfect to be mounted permanently.

5.0 out of 5 stars Muy buen producto

5.0 out of 5 stars Buen producto

5.0 out of 5 stars If you're hardwiring it in, you don't want a "cheap" charger, you want a good charger.

5.0 out of 5 stars Excelente aparato!

Perfect to be mounted permanently.

Muy buen producto

Buen producto

If you're hardwiring it in, you don't want a "cheap" charger, you want a good charger.

Excelente aparato!