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.

Works great, very nice to have during cold winter

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

Compacto, fácil de usar e instalar.

Saved me $400.00. Reconditioned my car battery that dealership told me, I needed to have my 14 month old replaced.

Wow! This unit has gotten me out of a few bad moments. It does everything it states it does. I think everyone should own one. It will forsure get you out of a dead batter jam everytime. Last year I installed this in my wife's car, and where we live it extremely cold here. She was at work it was -39°C not even a block heater can work properly in that temp. Anyways, her car wouldn't start. Everyone at her work there cars would not start. Plugged in this bad boy and 3 hours later, she was the only one who had her car started with no issues. This saved us a tow. So worth every penny. So now we plug this in all the time in the winter. We love this little unit. I know you would love it as well. Also this unit will prolong the life of your battery forsure. As led-acid battery's love to be full charged all the time. Don't believe me, looking up! They loose power in cold temps, so this unit will keep it topped up all the time. Haha, never get left out in the cold with this unit. If you thinking of not getting it. You can't say I didn't tell you so. Futher more, only get the one you have to install. It's best, you can buy a 2 way splitter for the block heater and this unit and plug it in at the same time. No fuss whats so ever. Perfect for brand new cars and all makes and models including Hybrid cars. NOTE : Not for full Electric cars vehicles. I've been an auto service technician for over 25 years.