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

Smaller than I expected but much easier to install because of its size. The mounting strap has two holes to install the plastic snap-on back to the metal of the vehicle inside the engine compartment using two self-tapping screws (provided). There are two lugs on the snap-on back that accommodate a velcro strap (also provided) which ties down the charger in addition to the snap-on back that is latched to the charger. A well thought out system to ensure that the charger cannot shake loose when the vehicle is moving. In my case I have attached the charger to the wall above the front passenger tire well of my Silverado truck. That way, the charging leads can easily reach the battery although the power lead is too short to go anywhere near the front grill (Maybe 2-3 ft long). My GFI socket is on the side of my garage, about 45ft away from the engine compartment but it's easy to run a 50ft outside-rated cable (SJTW 12/3) to the charger power cable under the hood. With the temperatures around 31 to 42 degrees F right now and a new battery I am able to keep the battery fully charged in a truck that sometimes sits on an outside concrete pad for 2-3 weeks at a time. I am very pleased with this product. It gives me piece of mind that I will always be able to crank my engine whatever the weather. It will also help me to prolong the battery life. I now own two NOCO chargers, both are able to condition a battery as well as charge it. My other NOCO charger is a NOCO GENIUS 10A waterproof marine charger which can be used for several different battery types and does a great job for my lawn tractor and 12v shed battery for LED lights. It can handle lithium batteries also which works for my kayak. My neighbors call me when they need help with charging because they now understand the problems caused by sulphates which NOCO battery chargers can deal with. NOCO make great products. I have no hesitation recommending them. (NOTE: I gave this 5 stars but only four lit up. The first one stayed empty).

I got this partially because I need a SLA charger and maintainer but a little bit also because of it restoration function. Some newer charger/maintainers like this also have the ability to apply a pulse that can help break up crystalization inside the battery. While this will not bring an old or damaged battery back to a new state, it does help with things like when a battery is allowed to discharge too far at least once but not significantly damaged otherwise. I didn't know for sure if it would help with my own car's battery, but decided to try it anyway. It actually did indeed seem to help. Before using this it would only last a few minutes with the radio powered on after the car was shut off before it would shut it down due to low voltage. Now it lasts about 30 minutes. This also translates to holding up much better when sitting over time. This is not magic, so it is very limited in what it is able to do (more serious damage may not even be repairable short of basically rebuilding the battery,) but in cases of one of the more common minor causes of SLA battery capacity loss it does indeed help. As for the actual charging and maintenance functions, these seem to work quite well. It's only a 2A maximum charge rate (it lowers twice in later stages of the charge process) so not well suited to large batteries such as those of a car except as a maintainer (which needs very little actual current,) but will do in a pinch if you have the time (I believe it listed 60 hours as the time required to 100% fully charge a car battery -- although it will likely crank in much less time than that.) You will probably want one of the larger ones for those. However, it does have the advantage of being able to safely work on practically any SLA battery you can reasonably throw at it -- provided you can spare the time for a larger battery. I am also using this to maintain (and hopefully restore) a much smaller battery and so far it seems to be working just fine. I'm not clear on the difference between this one and the 2D model. This one also comes with a mount if you would like to more permanently mount it (such as inside your car.) Interestingly they seem to have made the alligator clips that come with it have screw-mounted rings that can be removed for permanent installation at the terminal screws. This way you don't need a separate set of connectors for each as the 2D model did. So this is an option for those who need to do this.

Few have the experience with batteries and charging systems that I have. I'm 68 years old and a retired professional mechanic who SPECIALIZED in batteries, starters, alternators and electrical systems. This is what I did for a living and managed a specialty battery store then my own shop that sold virtually every battery for vehicles, diagnosed and installed all related charging and starting system parts. The number one cause of alternator failure is a LOW BATTERY. The alternator is NOT A BATTERY CHARGER. It will not charge up a discharged low battery. Many many folks have heard to jump start a dead battery and let it run or drive the vehicle and it will charge up. I will NOT and puts only a small surface charge on the battery. Essentially the battery is 99% discharged. I have seven vehicles and only one doesn't have a maintainer on it. That vehicle is a non-computerized F-100 Ford. However, my Winnebago RV, 2023 ATV, Honda Sabre M/C, Honda Fit, Ford Ranger and my Dodge Caravan all have maintainers on them. Computerized vehicles that are not used daily that sit for any amount of time get low on charge. That's a fact. As a professional, I can tell you that if you want to do yourself a HUGE favor, use charger maintainers. I use the Noco Genius 1 on many things I own and this Genius 2 now just installed on my Honda Fit. Little is worse than going out to a low or dead batteries. Just as bad is starting a car with a low battery then driving it. It's very bad on the charging system and related components. These Noco products feature wide compatibility, are highly functional and are very simple to use. It really is a plug in and forget product that is highly useful. You just have to remember to disconnect it when you use the vehicle.

The NOCO GENIUS2D is one of those products that instantly shows its quality the moment you open the box. Everything from the packaging to the finish on the charger feels solid and well-engineered. The components are thick, durable, and clearly designed for long-term, real-world use—far beyond the flimsy build you find in cheaper trickle chargers. I purchased two of these units and mounted them on both of our Can-Am Spyder's, and they’ve been flawless. Installation is refreshingly simple. The compact size makes it easy to work with, and the direct-mount design means no extra parts or awkward routing. The only challenge—and it’s a minor one—is finding the best permanent location inside the Spyder’s engine compartment. Space is tight, so a little creativity is required, but once mounted, the charger fits securely and stays out of the way. The wiring length is generous, and the connectors feel premium, locking into place with confidence. Performance is where this charger shines. It maintains the battery perfectly, keeping both bikes ready to ride through cold mornings and long periods of non-use. The smart charging logic is accurate and safe, eliminating the guesswork and babysitting that older chargers often require. For something that draws only 2 amps, the level of monitoring and regulation is impressive. It behaves like chargers that cost double or triple the price, especially those branded for “powersports” but offer no additional value. Because it’s fully automatic and designed to remain onboard full-time, it transforms battery maintenance into a simple plug-and-walk-away experience. For anyone who owns a Spyder, a motorcycle, an ATV, or even a small boat, this charger adds huge convenience for very little cost. Pros • High-quality components and durable construction • Compact, low-profile size ideal for onboard mounting • Simple, straightforward installation • Smart charging logic maintains batteries flawlessly • Excellent value compared to premium powersports chargers Cons • Finding the perfect mounting spot inside a Can-Am Spyder takes a little planning If you want a dependable, professional-grade onboard charger that keeps your Can-Am Spyder battery ready at all times, the NOCO GENIUS2D is an outstanding choice. After installing two of them, I wouldn’t use anything else.

I installed the NOCO GENIUS2D on my RAV4 after relocating my AGM Yellowtop battery to the rear. It bolted on easily using low-profile M8x1.25 10mm flat head screws, and while I haven’t permanently mounted it yet, it’s already working flawlessly. The charger maintains and tops off the battery just as shown in my video. I like that it’s fully automatic—no settings to fuss with—and the temperature compensation feature gives peace of mind for long-term use. Compact, efficient, and a solid solution for anyone running an auxiliary or relocated battery setup.

Works great, mounts in engine bay, automatic shut off when battery fully charged to protect battery. Good investment. .

I've had this installed on my truck for right at a year now, and I have to say if you don't drive for extended periods of time GET THIS. Not once have I ever had an issue with this maintainer and it's half the price of anything close to the reliability and quality of this one. It's small enough that you can tuck it away completely out of sight and just have the plug accessible when you need it. I always hated using the clamp styles just for the fact that they might pop off if you don't get it on the post good enough, this is as easy as plugging in an outlet and works flawlessly. I'm only reviewing this now, because I'm about to buy another for another one of my trucks for the winter.

I purchased the NOCO Genius2D, and it has exceeded my expectations! i have a Jeep that sits a significant amount of time. it hadn't been driven in nearly 7 months and the battery was stone dead! The installation process was straightforward. The included mounting bracket and eyelet cables made it easy to secure the charger near the battery. The 24-inch A/C and D/C cables provided ample length for a neat setup. This charger works flawlessly! After installing it, I left it plugged in overnight and by the next morning, the jeep started easily! It efficiently maintains the battery charge, ensuring my Jeep will always be ready to go! The charger also features short-circuit, over-voltage, and reverse polarity protection, which gives me peace of mind. Even if I mess up, I'm protected! The charger is very compact, which is a big plus. It fits easily under the hood without taking up much space. The IP65 rating for water and dust resistance is a great feature, especially for driving in various weather conditions. Considering its performance and features, this charger offers excellent value for its price. It’s a reliable and efficient solution for maintaining my vehicle's battery. Overall, I’m very satisfied with the NOCO Genius2D. It’s a high-quality, dependable charger that I would recommend to anyone in need of an onboard battery maintainer.