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

Being a senior I very seldom drive my car, it just sits in the garage. Often when I would go out to drive, my battery would be dead. After installing this, my car battery is always at its maximum capacity. I also bought the Noco eyelets and scrapped the alligator clips that were supplied so as to permanently enable me to connect the charger without opening my hood. I was able to extend the leads outside of the hood area with a small pigtail. Now I can just plug the charger in at that point and walk away. I keep the charger running 24 hours and only disconnected when I am going out for a drive. It works perfectly for my situation. It seems to be very well-made and I would recommend this trickle charger.

This works great as a compact small charger. I use it to keep my motorcycle and lawn tractor batteries maintained out of season. SO far as worked flawless and has been keeping the batteries topped off. Beats having to replace batteries every year.

There are a lots of these battery minders to choose from on the market but I always choose Noco because of the way they keep batteries topped off. I find that the batteries I leave on the Noco chargers for years on end tend to last longer than batteries I have had minded by other brands. I am phasing out Battery Tender and OptiMate brands I have in my arsenal all in favor of the Noco (I have well over a dozen in constant service). But why? First and foremost, the way Noco charges versus the other two brands seems to be more friendly to all types of batteries I've tested them on. On Flooded Lead Acid, I've noticed a much decreased need to top off water when using Noco. On SLA (AGM or Gel) the Noco chargers seem to treat the batteries better and they simply last longer, and on LifePo4 batteries where I don't build my own system, Noco is the only brand I trust for short periods. I never leave LifePo4 hooked up to a minder 24/7 no matter what the brand unless I program it myself or I'm using Victron in custom mode. The Noco charging methodology is an on-off-on system. It raises the batteries to a certain voltage, and then lets the voltage fall by a certain amount before turning on to top off again. I find this is much more gentle than the other way of doing it which is to set a voltage and then keep feeding that voltage constantly even when not delivering amperage. I find this very slowly cooks/simmers batteries to death over a long period of time. This is particularly true in Flooded lead acid where I have measured the water differential and the other brands burn up much more water meaning the battery is cooking where this just doesn't happen with the Noco brand. Secondly, Noco has a ton of accessories and even the cheapest Noco battery minders work well enough for small batteries up to normal car size and you don't have to oversize your minder to be sure your car or truck battery doesn't die. I even use a single 2A version on my diesel motors with dual batteries and the Nocos keep the batteries ready for use any time which some of my other battery minders couldn't manage. I hope you found this helpful!

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!

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 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've had this charger/maintainer going on about 6 months now and I love it! The size is compact and the display is convenient and easy to read at a distance. I don't have it hardwired to my battery terminals at the moment but I'm glad that's a built in option if I wanted to use the quick connect feature at some point. The clamps themselves are ergonomic and comfortable to get a grip on at weird angles (like for those batteries with front terminals that might not be easily accessible.) They are also compact enough and insulated well so that they're easy to tuck away without worrying about arcing if they should be near metal parts. The power cable is plenty long for use in the garage but if you're using it at a distance (out in the yard or a parking lot) you might need an extension cable which is expected for a compact device like this. I mostly use this for maintenance charges to keep my battery healthy long term, though I recently got to use it when my friend was in a pinch and had a completely dead battery during a cold snap. I wasn't sure with the battery's age whether or not it would accept a charge but this charger didn't miss a beat and went to work immediately! It had the dead battery charged almost completely by the time we got back from getting lunch!

I returned this: so why 5 stars? It could not charge my dead battery (the 10A model did), but this product does *exactly* what it is supposed to. First, this is designed to be a trickle charger (keeping the battery full if the car isn't driven a lot or otherwise cannot keep the battery charged). It is not intended to charge a dead battery (but usually can). If you are looking for a trickle charger, you'll probably notice that nearly all the reviews for that use case are 5-star. If you are looking to use it to charge a dead battery, the reviews are mixed. So: why is that? As a trickle charger, the slow 2A speed is fine. But to charge a dead battery, you not only have the slow charging speed, but you also may have a "parasitic battery drain" (something like a dashcam that uses some battery power 24x7 even if the car is off). If you do, it can take a LOT longer (days, or forever) to charge the battery... because that 2A of power needs to both charge the battery AND supply the power needs of that parasitic drain. Something else to note: many reviews talk about how it takes "forever" to get to 25% charged, but then fairly quick after that. At first, I assumed like everyone else that it was a design flaw. But it is not. My battery, for example, was at about 4 volts... but a car battery is considered 0% charged at about 10.5-11.5 volts. So the charger has a lot of work to do to get it to 0%. For those that are curious about how people are finding out the voltage, this device does not report the voltage. You can use a multimeter to do that (you must set it to DC voltage, 20V setting if you have it, and just touch the black/red leads to the negative/positive terminals). So in my case, like some of the 1-star complaints, after 48 hours of having this plugged in, the battery hadn't hit the 25% charged level. If I had disconnected the battery from the car (removing that parasitic drain), it would have worked. But instead, I got the 10A version, which took care of it within a few hours (and had a nice battery repair feature: 12V car batteries often get damaged with a battery that is dead for even a few hours). My advice? If you are looking for a trickle charger (e.g. if you often go a week without driving), definitely buy this. If you want to charge a dead battery, the 10A model will be a lot faster (and can help repair any damage)... this will work, but may require disconnecting the battery if you have a parasitic drain. I hope you found this helpful!

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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