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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

  • Based on 9,671 reviews
Condition: New
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Availability: In Stock.
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Arrives Monday, Sep 29
Order within 43 minutes
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Features

  • 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.

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.

Brand: NOCO


Color: Black


Product Dimensions: 3.47"D x 3.43"W x 6.5"H


Item Weight: 0.5 Pounds


Output Voltage: 12 Volts


Product Dimensions: 3.47 x 3.43 x 6.5 inches


Item Weight: 8 ounces


Item model number: GENIUS2D


Date First Available: August 5, 2019


Department: unisex-adult


Manufacturer: NOCO


Country of Origin: China


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Sep 29

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Perfect to be mounted permanently.
Size: 2A
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. ... show more
Reviewed in the United States on June 12, 2025 by Red

  • If you're hardwiring it in, you don't want a "cheap" charger, you want a good charger.
Size: 2A
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. ... show more
Reviewed in the United States on June 17, 2025 by Ken S.

  • Amazing product
Size: 2A
I have a fair number of add-on electronics in my truck (a 2021 Toyota Tacoma), and I also sometimes don't drive my truck for many weeks. I had a couple of instances in the past where I went to drive it after a fairly long while and the battery had drained too low to start it. Ever since I added this in and have started plugging my truck in when it's just sitting I haven't had any issues at all. The battery tending / conditioning that this does has also noticeably improved my battery's ability to hold a charge as well. The ability. I have it mounted in the engine bay and I leave it connected to the battery and plug in the truck through the front grill when it's parked to keep the battery topped up and conditioned. It's very convenient. I highly recommend this product. ... show more
Reviewed in the United States on June 12, 2025 by Ryan

  • Great In-Car charger
Size: 2A
Amazing In-Car charger, so much easier than pulling my battery every other week when I don’t feel like driving the project car. Would highly recommend for any car that doesn’t get driven very much.
Reviewed in the United States on July 16, 2025 by Dominic

  • Not for lithium
Size: 2A
I’ve had multiple noco chargers for my boat and use this one for my starter battery. Only negative is it won’t work on lithium. I originally ordered to charge my graph battery but had to change plans when I read the manual. Says only for up to 60ah battery but it seems fine on my 100ah cranking battery. Kept it since it was cheap and I didn’t want to spend triple the price on a lithium compatible, just needed to do some rewire in the boat. ... show more
Reviewed in the United States on May 27, 2025 by Michael

  • Great 2A charger or maintainer
Size: 2A
Why did you pick this product vs others?: Love this brand. I wasnt sure if this would wobble when strapped in place but it actually snaps INTO the back mounted plastic and is simply secured with the velcro. So it cant wibble or wobble when fastened. I actually mounted this on the garage wall to keep my spare car plugged in and it mounted nicely on the edge of a wall 2x4 stud. ... show more
Reviewed in the United States on June 18, 2025 by Throckmorton P. Geldersleeve

  • Great
Size: 2A
Very good quality, accomplished my needs, would recommend some sticky velcro strips if you want to drill it in
Reviewed in the United States on July 17, 2025 by Steven Bilderback

  • Happy
Size: 2A
Very happy with the delivery and the product, I recommend it 100%
Reviewed in the United States on July 17, 2025 by Andres Ramirez

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