Customer Reviews: NOCO Genius GEN4 40 Amp 4-Bank Waterproof Smart On-Board Battery Charger
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Style Name: 4-Bank 40 Amp|Change
Price:$296.12+ Free shipping with Amazon Prime
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on February 15, 2012
I did a LOT of on line reviewing before purchasing my Genius 2 charger. I looked at many brand and narrowed it down to either Minn Kota or the NOCO Genius 2. I'm glad I went with the Gen2. I wired up the charger plug to a recessed outlet on my boat instead of the plug-in cord. The charger is small and light and give great power output for the money. 2 banks @ 10amps per bank. It automatically charges and then shuts off and goes into a "mainatain" mode. I charge both my starting batter and my deep cycle battery with it. It knows how to charge each batter based on the internal circuitry. I've used it about 1/2 a season (30 plus charges) and typically leave it plugged in for several days at a time. Batteries are perfectly charged and ready to go. I would HIGHLY recommend this charger to anyone who is looking for an onboard charging system for your boat. It beats the hell out of hooking up an individual battery charger after each trip. I just plug in an extension cord and I'm good to go. has the absolute BEST price on it too. I paid about $115 delivered and other sites are charging $179 or more! Its listed on the NOCO site for $215.
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on August 13, 2011
Used to charge two Optima Blue Top deep cycle marine batteries and this charger is the best! Totally automated and very safe! Won't burn up or overcharge batteries. There's some serious technology in this charger!
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on March 4, 2012
Received item fast and was exactly as advertised. I read a lot of reviews which helped me with this purchase. I do agree with some of the reviews is that the power cord is a little short, but really no problem or issue for my application. IF you are looking for an on board charger, this is it. Price is best by far. Great product.
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on December 17, 2011
I put a 20 amp 2 bank charger on my Mako after my old unit failed to charge properly. I did quite a bit of research before purchasing and found the reviews to be very helpful. I watched the unit very carefully with my voltmeter for the first few weeks and it has continued to perform flawlessly. This may be the best on board charger I have ever owned. The guys at NOCO built a product that is as simple to install as hooking up a few wires and plug it in and it does the rest. Green light is charged battery and red light is charging. The Genius has multistage charging typically found in much more expensive units. The quality is fantastic, fully sealed for marine environments and size is smaller than most other units of equal amps. I can only say thanks to NOCO. I have never taking the time to review a product and felt compelled to review this unit and as an added bonus it is made in the USA.
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on December 5, 2011
It simply works and works great!

I have mine set up for two batteries, and that means the charger has four wires, a positive and negative for each battery, so my two battery system needed a "two bank" charger.

Multiple battery installations require one pair of wires from the charger to each individual battery. Generally you can get one to four "banks" on a charger. Each one charges a 12 volt battery at ten amps.

It is well sealed with epoxy, weather proof, temperature proof, and has two green leds, quite bright, that come on when the batteries are at 100% capacity. Two different leds show a red color while still charging, so it's hard to get mixed up.

This unit drops amperage in predetermined levels several times during the charge, ending at a trickle charges after the batteries are fully charged. This prevents overcharging, overheating, and lowering of battery fluid levels from heat, during the charging process. It also has the feature that cleans the plates in the batteries, which helps the battery life a lot and extends their peak performance. I don't know how it works...I don't care, as long as it keeps those expensive marine batteries alive and happy.

I wanted a battery charger smarter than I am, one I could plug and forget, even during rain, wind, heat of summer, to below freezing temperatures, and that's what I got. It has worked flawlessly.

You can find cheaper charges, but eventually that savings will be lost on more frequent battery change-outs, or worse, battery failure out on the lake. Just buy the best, and forget about having to worry whether it's doing its job correctly, and having to run out and undo the leads when the battery is full, to avoid overcharging.

I am impressed with the fact that this charger has a programmed chip inside to calculate, control, and vary the charging cycle amperage to accommodate the state of each individual battery. While it's best to use batteries with the same amp hours of capacity, some of us can't go out and drop over a hundred dollars on a new battery just to match capacities. I've mixed 90 amp hour and 115 amp hour batteries, and have had no problems whatsoever with this "intelligent" charger.

I'd recommend this charger. I'm very happy, and trust it to perform without fault for as long as I have it. It's already been through deluge rainfalls several times without fail, high wind conditions, and cold nights. It simply waits there for the battery to indicate its needs, then it comes to life.

It's worth every penny! The features can't be ignored.
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on August 31, 2011
I installed this in a 25' boat. This is a well made, durable charger that was easy to install. The only dilemma was that the leads are a little short for what I needed to do. The installation instructions say to not alter the charger. I contacted the technical assistance folks and they indicated that extending the leads was okay. I did and everything works great. Great product, responsive technical assistance and an easy install.
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on February 13, 2012
Recently purchased this to replace a 2 bank 5 amp charger. Does everything as advertised. Leave it plugged in and walk away. If you are looking to buy a 3 bank charger for your boat, dont pay 300 or even 400 bucks for the ones at bass pro shops or cabelas. This one does everything the higher priced models do for 145 bucks. Obviously, durability is not known yet but if it lasts 5-10 years, I will be happy. As for the knucklehead who gave this a one star rating because it dont charge "36 volt" batteries, only "12"...........are you kidding me?? three 12 volt batteries make 36 volts!!! It charges all three at the same
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on November 7, 2011
Excellent product. I have installed on my Jetcraft 1625SK with duel batteries, always fully charged, a must for all boats, Amazon as always was great, quick delivery,will always buy from amazon.
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on July 10, 2011
This could be a million dollars and it would be worth it but for slightly over 100 dollars it's almost illegal. This charger does everything and the nice part is you can turn it on and walk away and know your taken care. When you return no matter how long you've been away your boat, motor home, or whatever will start and function perfectly as it should....I give it 10 stars.
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on January 30, 2012
I installed the charger in my boat with minimal effort, simply mount the charger and hook up the wires. Charger brought my batteries to full charge in about 5 hours. Batteries seem to last longer after using this charger.
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