GENIUS2 2A 6/12V Smart Battery Charger, Trickle Charger & Maintainer

If your even remotely considering buying this do it. My bf uses it for his car to prevent from buying so many batteries on his garage baby. I got it. Did exactly as it said and very good we had no issues. Until recently we noticed no lights were on the device. Well we were within warranty. But we all know how that goes. But! To my surprise it was extremely easy. The person I spoke with was very kind. They immediately sent a replacement after testing ours. So good product good customer service always good! And we have more than one the other hasn't skipped a beat. We will for sure be buying more products from this company!

Charged a very low battery and has maintained the charge. Works great.

This is now my second unit. The first has been running flawlessly, nonstop, for 4+ years, keeping the lithium replacement battery on one of my motorcycles topped up. I just upgraded to a lithium battery on one of my other motorcycles and immediately bought this unit. It charges quickly. It does not overcharge. The battery I bought this charger for the first time is still in service, which tells me this little charger is VERY good a maintaining batteries. As a motorcycle battery tender/maintainer, I don’t think you can beat it. I highly recommend.

I'm really impressed with this charger and maintainer. I bought it because I was tired of finding dead batteries after equipment had been sitting unused for a while, and it has already proven its value.The first battery I connected was my trolling motor battery, which was nearly dead. I simply hooked it up, selected the proper mode, and let it do its thing. Within about a day, the battery was fully charged, and now the green light lets me know it's being maintained automatically. It's great knowing the battery will be ready whenever I need it.The charger is incredibly easy to use. Just connect it, choose the correct battery type, and it takes care of the rest. I was so happy with it that I bought another one for my mom to use on the farm to keep her equipment batteries maintained as well.NOCO has built a fantastic product that's simple, reliable, and gives real peace of mind. If you have vehicles, boats, lawn equipment, or anything that sits for extended periods, this is well worth the investment.It comes with a neat mounting bracket that I installed by my work bench now too.

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.

I was skeptical at first because there are so many battery chargers/maintainers out there, but after using NOCO Genius chargers for a while, I’m genuinely impressed. I now own FOUR of them.I started with the NOCO Genius 1 for my Kawasaki SxS. It worked so well that I bought a second Genius 1 for my mom’s vehicle. Since then, I’ve added a Genius 2 for my own vehicle and a Gen5 X1 waterproof onboard charger for our boat.Everything about these chargers feels premium. The packaging is excellent, the cables are thick and durable, the LED indicators are bright and easy to see even across the garage during the day, and even the small details stand out — like the rubber feet on the bottom so the unit doesn’t scratch your toolbox or workbench.The Genius Cable Extension accessory has been AMAZING. No more struggling with clamps or leaving vehicle hoods open. Once the extension is attached to the battery posts, you simply plug the charger into the quick connect and you’re done. Super clean setup and extremely convenient.One of my favorite features is the memory setting. Once you select the battery type/mode, the charger remembers it even after being unplugged for a while. That’s incredibly useful after a power outage or if you move the charger around.I also really appreciate the thermal protection and smart charging features. During a 100+ degree day in my garage, I actually watched the charger reduce/pause charging to protect the battery from heat. Heat destroys batteries, so seeing the charger actively monitor conditions gave me a lot of confidence.I tested the maintainer function as well. Once the battery reached full charge, the indicator stayed green. Then I opened the doors and turned on the parking lights to create a battery draw. Within minutes, the NOCO detected the voltage drop and automatically started charging again. That’s exactly what you want from a smart maintainer.My personal thoughts on the models:Genius 1: Perfect for motorcycles, ATVs, UTVs, SxS, or vehicles that sit for long periods.Genius 2: Faster charging and better/more detailed status indicators.Gen5 X1: Excellent for marine applications since it’s waterproof and designed as a permanent onboard charger.Yes, these cost more than some cheaper chargers, but in my opinion, you absolutely get what you pay for. They don’t overcharge batteries, they intelligently monitor and maintain them, and the overall build quality is excellent.After owning four of them, my only regret is not buying them sooner.

Works well, seems to be keeping my battery up

My husband quit driving two years ago, and his vehicle, a 2009 Mini Cooper sits in our garage. I have tried to remember to take it out and drive it from time to time, but the little that I'm doing has not kept the battery charged. I bought the NOCO GENIUS2 after using the company's jumpstarter to jump a nearly dead battery the week before. I had watched YouTube videos on the battery chargers (various sizes) and decided that the GENIUS2 would be the best fit for my needs, even though I think the GENIUS1 would have sufficed as this car is always garaged and doesn't need to be weather-resistant, which the 2 is.I unboxed the GENIUS2, connected the red (+) and then the neg (-), plugged the charger into an extension cord - the 72" cord isn't quite enough and most will need an extension cord to use this charger - and then plugged the extension cord into a surge-protected outlet. The charger recognized the 12V connection and started charging within 10 seconds.Despite having run the car for about an hour, the battery was still low, but was topped off to full charge in 6 hours. I took the charger off the battery (reversing the order of how I put it on) and let the vehicle sit for 24 hours without the charger on it. When I put the charger back on, it was still at full battery. FYI... the battery is fairly new so this was not unexpected.I like that this battery charger is so easy to use and clearly shows the operator what's going on and when the process is completed.Based on my positive experience with both the NOCO jumpstarter and the GENIUS2, I've purchased a GENIUS1 to use with my lawn tractor, replacing an older one by another maker. I think I've found a brand I can trust, and I'm happy to recommend the NOCO GENIUS2 to anyone who needs a automotive charger and battery maintainer.SIDE NOTE: My husband didn't think I'd be able to jumpstart the car with the jumper pack, nor did he think I'd be able to setup the battery maintainer. He was thrilled that he was wrong and that it was all so easy to do. The old way of jumpstarting a battery and getting sparks or feeling like you might get zapped is no longer a worry. No one should be afraid to use these products and everyone should have at least the jumpstarter in their car. (It would make a great graduation gift for kids going to college.)

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

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Charged battery and did it's job. Couldn't get the full use since the battery i was working with was completely dead and needed full replacement. Add ons were good and it seemed simple and straight forward use. Will try trickle charge on new one in winter to see

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