NOCOGENIUS2D: 2A 12V Smart Onboard Battery Charger - Direct-Mount Automatic Maintainer, Trickle Charger & Desulfator with Overcharge Protection & Temperature Compensation – For Lead-Acid Batteries

I have two Yamaha FXHO Waverunners. The original lead acid battery that came from the factory on my 2021 model always starts without issue even if it sets up all winter. My 2007 with a new AGM battery always has trouble starting if I don't run it frequently. Leaving it idle all winter killed the previous battery. The units came with zero instructions. I had to return to the Amazon listing to see an explanation of the red and green solid/pulsing lights on the units. The packaging does state that it is for batteries up to 40ah. I just installed two of the Noco Genius 2D devices and will come back here to update how they are performing.

Works better than expected, so far.I've had this roughly a month or two. Since Covid happened, I've been working from home. While that is great, it means I might not drive my car for weeks on end. If you can remember to auto start your vehicle on a regular basis, then perhaps this isn't needed. But if you don't, the computer and electronics are gonna suck your battery dry. Let it go too long and it'll discharge the battery so much, it'll never hold a charge again.This is the solution.Only downside so far, is I had to leave the hood unlatched to plug the exterior grade extension cord in. With the hood not secure, remote stater will not engage. I can't start the car from the house in that configuration.I've bought an external plug the connects to this and routes the connection to a spot in the grill or fender. (Also bought here) I just haven't had the, the time, the nerve, or the weather yet, to cut a hole in my car to install it!Will update my review when I decide where it will go.Btw: You still need to run the car at least once a month or your gas will go bad.If the car is gonna sit like that, don't fill the tank!

Perfect! I have an older Honda Odessey van with the dreaded vampire drain on the battery which depletes my charge in a day. This NOCO is small and fits into my hood space. I just ran the a/c cord out the bottom and plug it in without having to open the hood. Keppa the battery charged and shuts off when done. I hard wired it directly to the battery with supplied leads. I zip tied all loose ends.

Great little device for keeping your battery at a full charge in a boat. Hook it up, plug it in and forget it. Just that easy..No need to brake out the big charger for what this little thing can do.

Does the job I require, but longer power cords will make it easier to work with on multiple cars or trucks.

I have a regulated power supply, deep cycle battery, and this charger. I have set up a 12 inch woofer in my office with an amplifier. This little charger is perfect to plug your car amplifier in. It keeps my battery perfect and my system sounds great. I no longer have to drive in my car and get tickets for my radio to be loud. Now I can do it in my house.😂

Too small for my application, but I still give it 5 stars because it does exactly what it's meant to do.Best used as a battery maintainer for starting batteries (generator, motorcycle, car, etc...)I installed it in my RV, and when I'm using the RV for a few days at a time, the batteries run down because I really need more power than the 2A this charger provides - but again, it works perfectly.

Used it to keep my car battery charged over the winter, while car was in storage. After sitting for nearly 5 months car fired immediately. Would definitely recommend.