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NOCO Genius GEN2 20 Amp 2-Bank Waterproof Smart On-Board Battery Charger

by NOCO
4.4 out of 5 stars 462 customer reviews
| 26 answered questions

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2-Bank 20 Amp
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  • 20 Amperes (10 Amperes per bank) Smart On-Board Battery Charger for 12-volt batteries; charges and maintains all types of lead-acid batteries from 25-230Ah, including Wet, Gel, MF, and AGM
  • Designed for safety; safe for anyone to use; does not generate sparks, and protects against reverse battery hookup, short circuit, open circuit, overheat, overcurrent and does not overcharge the battery
  • 100 percent waterproof; completely sealed to protect against the most extreme environments and rated at IP68
  • Rapid Charging Technology; Charges batteries 2X faster than traditional battery chargers, and a lightweight, compact design
  • The most advanced charger ever; it features innovative and advanced technology that makes charging easy and simple; the charger makes important charging decisions so you don't have to. It is the safest, most effective charger you may ever use
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$174.95 & FREE Shipping Only 1 left in stock. Ships from and sold by Battery Warehouse of Augusta.

Frequently Bought Together

  • NOCO Genius GEN2 20 Amp 2-Bank Waterproof Smart On-Board Battery Charger
  • +
  • NOCO Genius GCP1 Black 13 Amp 125V AC Port Plug
Total price: $191.90
Buy the selected items together

Product Information

Style:2-Bank 20 Amp

Technical Details

Brand NOCO
Item Weight 9.1 pounds
Product Dimensions 9 x 5.7 x 10.2 inches
Origin China
Item model number GEN2
Manufacturer Part Number GEN2
Amperage 20 A
Voltage 12

Technical Specification

Product Warranty: For warranty information about this product, please click here [PDF ]

Additional Information

ASIN B003JSJS5I
Customer Reviews
4.4 out of 5 stars 462 customer reviews

4.4 out of 5 stars
Best Sellers Rank #27,353 in Automotive (See top 100)
#32 in Sports & Outdoors > Sports & Fitness > Boating & Sailing > Boating > Electrical Equipment > Battery Chargers
#151 in Automotive > Tools & Equipment > Jump Starters, Battery Chargers & Portable Power > Battery Chargers
#1,432 in Sports & Outdoors > Sports & Fitness > Hunting & Fishing > Fishing > Fishing Watercraft & Trolling Motors
Shipping Weight 9.3 pounds (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available January 27, 2010

Warranty & Support

Warranty, Parts:Parts
Product Warranty: For warranty information about this product, please click here [PDF ]

Product Description

Style: 2-Bank 20 Amp

The on-board battery charger offers the perfect mix of high-technology and rugged construction. With a fully-sealed, waterproof housing, the GEN1 can be mounted directly onto a variety of applications including boats, tractors and a wide range of equipment. With the intelligent NOCO VosFX processor constantly monitoring the power input, attached battery and charger itself, the GEN1 charger is capable of diagnosing, recovering, charging and maintaining batteries. Automatically adjusts itself to changing current needs. Reverse polarity, short circuit, open circuit, spark proof, overheat, overcurrent and overcharge. High-frequency, high-efficiency for a lightweight, compact charger. Charges batteries 2 times faster than traditional linear battery chargers. 100 per cent full charge even with varying A/C input voltages. Safely charges Wet, Gel, MF and AGM batteries. Automatically shuts off if charger remains in bulk charge mode for an extended period of time. 100 per cent completely sealed. Protects our units from the most extreme environments and rated at IP68. Box includes a charger, owner's manual and user guide and product registration card. 3 Year Limited Warranty and meets ISO 8846 marine standards and ignition protected (US Coast Guard 33 CFR 183.410).

From the Manufacturer

battery charger, marine battery charger, boat battery charger, onboard battery charger, marine, boat
marine battery charger, onboard battery charger, on board battery charger, on-board battery charger
Model GENM1 GENM2 GEN1 GEN2 GEN3 GEN4
Banks 1 2 1 2 3 4
Amps Per Bank 4A 4A 10A 10A 10A 10A
Voltage 12V 12V 12V 12V 12V 12V
Total Amp Output 4A 8A 10A 20A 30A 40A
IP68 Waterproof

Customer Reviews

Top Customer Reviews

Style Name: 2-Bank 20 Amp Verified Purchase
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. Amazon.com 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.
1 Comment 110 of 111 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: 2-Bank 20 Amp Verified Purchase
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!
Comment 101 of 105 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: 2-Bank 20 Amp Verified Purchase
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.
Comment 59 of 61 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: 2-Bank 20 Amp Verified Purchase
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.
Comment 53 of 55 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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By rico on March 17, 2012
Style Name: 2-Bank 20 Amp Verified Purchase
Works like a charm, leads could be a couple feet longer, had to lengthen one going to front of boat. Oh well, nice unit, no nonsense, just plug it in and go!
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Style Name: 2-Bank 20 Amp Verified Purchase
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.
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Comment 53 of 57 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: 2-Bank 20 Amp Verified Purchase
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.
2 Comments 47 of 50 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: 2-Bank 20 Amp Verified Purchase
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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