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

As a dedicated auto enthusiast, I use the best quality products available on the market and the NOCO chargers have certainly earned their place based on outstanding performance and value. These compact trickle chargers are designed and constructed of high quality materials and components that will provide many years of dependable service. I consistently use three of the 2 amp chargers on the cars that are not driven frequently as well as my ATV and lawn tractor. One of the best features is the chargers’ ability to detect high and low temperature conditions and automatically adjust the charging rate so as to not overheat the battery or the charger itself. The quality and reliability of NOCO battery chargers are so good that I have also purchased these products as gifts for others who also seek out the best automotive products available today.

I use this to recharge my and maintain charge on my garden tractor. Simple to connect and operate. Like the display indicating charge progress. Controller will not let it overcharge. Appears durable. Works great

I installed this on a riding mower battery upon receiving. It powered up immediately and showed charge level and after an hour of charging, complete charge, so seems to function as described. Did not notice any high heat levels and was very easy to install good thing as I didn't receive any instructions in box. Very lightweight and sees t be a durable unit. Probably will be ordering another for atv batter. Decent comparable price.

I'm really happy with my Genius 2. I upgraded my motorcycle battery from a basic lead acid type to an AGM. Since it's a different type of battery, I was concerned that my basic trickle charger wouldn't be able to properly maintain a charge for it, especially during the cold winter months, so I asked the counter guy at United Battery in Portland what he would suggest. He said that the Genius 2 was what they recommended; he had a whole shelf full of them behind the counter, but they cost 50% more than what I paid on Amazon. The charger is adjustable for different battery types, including AGM and Lithium, and it's really easy to use. A simple push button rotates you through the different modes, and the charging status is easy to read to the multi-colored charging bar. The product seems well-built and heavy-duty. The cord is long enough to reach across my carport, and the wire feels heavy and durable. This charger has a connector clip that attaches to a variety of different ends. The basic alligator clamps are included, but I also bought an SAE adapter that connects straight to the motorcycle, so I can trickle charge the battery and maintain a charge without having to remove the seat.

I have had the Genius2 since July of 2024. The following is my experience so far. I have found it very easy to use on the 12V Batteries of my two Ford Escapes (2010 Model and 2014 Titanium Model). Both these are ordinary Lead-Acid Batteries (and not AGM, Lithium or any other fancy battery). When we start the Genius2 up by connecting the Output Alligator Jaws to the Car Battery Terminals, I believe the "default" is set to the ordinary "12V Battery Mode". Therefore, we do not have to set it to the 12V Mode ourselves. To completely "top off" any Battery, the best thing to do is to leave it connected throughout the night. I will say that it will take at least 12-hours to completely top-off any normal 12V Car or SUV Battery. Of course, if one is in a hurry he can disconnect it and drive off at any point he wants, as long as he is confident that there is sufficient power in the Battery to restart while trying to get back. The Charger has 2-Red Light Indicators, then an Orange Light and then the Green Light (showing Full Charge). It starts with the first Red Light on the left and then as the charge progresses, it shows 2 Red Lights, then the Orange Light comes up and then finally the Green, all of these being "additive". As long as there are 2-Red Lights, one can disconnect and drive off if the car is needed immediately for some reason; there should be enough Battery Power from then onwards to start and stop the car several times. I have used the Genius2 many times over the last year, merely to top-off my Batteries. The only thing is, because this is a "trickle charger", it takes quite some time to do its job. We have to be patient with this model. However, I have to mention one "failure" I have experienced. My 2010 Ford Escape Battery had completely died once because I had not used it for over a month and forgot to top-off the Battery using the Genius2. I have to say that the Battery was "nearly dead" - with Voltage well below 1-Volt even I think. So, I connected the Genius2 wishing that it would recharge it completely. However, that it failed to do because it did not even "sense the presence of the Battery". The Genius2 remained in "Standby Mode" and the 12V Mode did not come up. At this point, I used the "Force Mode". To do that, we have to "keep pressing the Mode Button for 7 seconds". When we do that, all the lights start flashing. At this point, pressing the Mode Button again gives us the 12V Mode. I got up to this point. However, after trying to go through the "cycle" several times (with some lights flashing as is normal), the Genius2 simply returned to "Standby Mode". I did this many times - every ten minutes - for several hours, hoping it would come to a point when it would begin charging the Battery but it did not. The "Force Mode Operation" failed for the Genius2 (in that condition of my Battery, which was nearly dead, I have to add). Finally I "Jump Started" my Car and took it out for a drive for about 30-40 minutes. After coming back into the garage I stopped the car and then tried starting again. The car started normally. That told me the Battery now had "sufficient power" back again to start the car a few times. After that, I reconnected the Genius2 just to see what happens. This time it did sense the Battery, went to the default 12V mode immediately and started charging the Battery. It was working once again - to my great relief. I kept it connected and after about 12-hours of charging, the Green Light came up - telling me that the Battery was now completely "topped off". So, the Genius2 did do its job but it required "some Voltage" in the Battery to start the process. My Battery had drained so much that even the "Force Mode" could not charge it. So, I consider it to be a case of "failure" for Genius2. That is why I haven't given it a full 5-Stars. My question remains as to whether a "Genius5" would be able to do the job in "Force Mode" or not for this kind of Battery Drainage, where the Voltage had gone to nearly "Zero". The Genius5 has "5 Amp" capacity and maybe that would do the job. I am not sure of it though because I do not have the Genius5. The question also remains in my mind as to whether a Genius10 would do the job in this condition, if the Genius5 also fails in the situation. Maybe others with a similar experience can tell us more. My SUGGESTION to Potential Buyers is to skip the Genius2 and go for Genius5. For only $20 more, get the higher model. Having higher Power, it should perform better and top-off your Battery in "less time" compared to the Genius2. There is also hope that if your Battery really goes down to almost "0", the "Force Mode" of Genius5 will still be able to revive the Battery and recharge it fully. I am not sure of it as I said above but at least, it has more of a chance compared to the Genius2. The Genius5 also has an "additional mode" and that is the "Repair Mode". Apparently, it can execute "repairs" deep down in the Battery Cells which improves Battery Performance in a big way. At least, that is the claim in the advertisement. The Genius2 does not have that ability at all. HOWEVER, please NOTE right away that you SHOULD NOT attempt to use the "Repair Mode" while the Battery is still connected to the Car. You have to detach the Battery from the Car to do it. To do that, you can only disconnect the "Negative Terminal" of the Battery and keep it away from the Battery (it should not touch anything on the Battery). The Battery can still sit inside the Car; you do not have to remove it physically. Then you can use the Repair Mode of Genius5. Of course, as soon as you disconnect the Battery the "Car Electronics Memory" gets wiped out and so, before you do that you have to ensure that a "steady 12V supply" keeps going to the Electronic Circuit. The way to "input" 12V into the Electronic Circuitry is through your Car's OBD-II Socket. I have identified several, inexpensive components to be able to feed a steady 12V supply through the OBD-II into the Car's Electronic Circuitry but I have not used it yet and therefore, will not recommend them right away. This is just to make readers "aware" of the problems of disconnecting a Car's Battery without feeding 12V into the Electronic Circuitry to maintain the "Settings" stored in the Memory, and that relatively inexpensive items are available to be able to do that (say another $50 or so maximum). In any case, I think the Genius2 is a good product which I have used for nearly a year. I will suggest though that if you were going to buy it, think hard about buying the Genius5 instead.

This is our 3rd one. We have 3 classic cars that over winter we need to use the trickle charger. I love this one because it shows all types of batteries. It worked so well that even an old batter laying around was brought back to life after a few weeks or so. We now use it for lawn mower batteries, cars, and even generator batteries too! Its a very good way to recycle instead of returning, just put it on the trickle charger. A friend who is a college professor who teaches automotive technology recommended this trickle charger. He said he uses these to bring old batteries back to life to save the college some money and to recycle.

Worked perfectly and was very easy to figure out. I have an older car I don't drive often, and I accidentally let the battery drain to where the car wouldn't start. The battery wasn't fully dead though, so I was able to charge it back to life overnight by just using the clamps on this. Didn't even have to remove battery cables. Saved me from having to go buy a new battery or from having to remove this one to have it charged. Will definitely be using this moving forward to maintain charge between uses. Would recommend.

I recently purchased the GENIUS2 and I must say, it has completely exceeded my expectations. Right out of the box, the first thing that struck me was its compact design. It's small and lightweight, making it incredibly convenient for storage and handling. Setting it up was a breeze. The instructions were clear and straightforward, ensuring a hassle-free experience even for someone who isn't particularly tech-savvy. This ease of setup is a huge plus, especially in emergency situations where time and simplicity are of the essence. Simply connect your battery and turn the device on, click the button to select the correct mode and you're good to go! The fact that it works as expected without any complications adds a level of trust and reliability that I greatly appreciate. Additionally, the packaging was well-thought-out and secure, protecting the charger during shipping. This attention to detail extends to the charger itself, which has a premium feel to it. The build quality is excellent – it doesn’t feel flimsy or cheap, which is often a concern with tech products. Overall, the NOCO GENIUS2 is an outstanding product that I would highly recommend. Its combination of compact size, ease of use, efficient performance, and premium build quality makes it a top-notch choice for anyone in need of a reliable car battery charger.

Straight out of the box and put to work.......you need to sort the plug out though, not Aus standard.

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Funciona muy bien ya la ocupe dos veces y carga bien las baterías en este caso de motos, no la he probado en batería de carros ya que no he tenido necesidad

The pandemic situation has me working from home now. I don't drive my SUV as much as I used to and it can sleep unused in the garage for days. And if I use it, it's for a quick drive to stores and not long enough drives to fully charge the battery. Once I had to use my portable booster as the battery got too weak over time and I want to avoid this situation as it shortens the battery's life. The Noco charger is the next best thing to keep the battery in tip-top shape and since my SUV is in the garage at all times, it's a well sheltered area. Pop the hood, connect it to the battery and it goes to work. I don't have to worry about my car's battery anymore. I don't need the bigger models with faster charging. Just one I can leave on overnight to keep the battery charged. The cabling is quite long so it's easy to reach a power outlet. The eyelets are part of the clamps so it has the option of a permanent install for quick connecting (something I'm considering). It took overnight to fully charge the battery as it's only 2amps, but I'm not in a hurry. Once charging is done, the Noco switches to maintenance mode. Until I got the Noco, I had no idea what a desulfator was or that battery sulfation was even a thing. Had to google it. Seems like there are products out there that can kill your battery if not used properly, but can also work better when used properly. In other words, they need expert hands. But so far the reviews were all positive for the Noco Genius2. I haven't had it long enough to judge either way, but I'm leaning toward trusting it. So far the battery has been performing just fine and I don't have to worry about draining it. I won't remove a star for this, but I REALLY WISH Noco would supply a carrying pouch like they do with their booster packs. The wires are long and can become a tangled mess in the drawer. Come on, Noco. It ain't a big expense to put a pouch in the box.