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NOCO Genius G4 6V/12V 4.4 Amp 4-Bank Battery Charger and Maintainer

4.5 4.5 out of 5 stars 677 ratings

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Brand NOCO
Color Multi
Product Dimensions 9.3"D x 9.4"W x 2.5"H
Item Weight 2.7 Pounds
Input Voltage 120 Volts

About this item

  • The most convenient way to charge and maintain multiple vehicles for extending battery life and year-round battery maintenance of your car, boat, truck, RV, lawnmower, or any other vehicle.
  • Completely recharge smaller capacity batteries on motorcycles, atvs, snowmobiles, personal watercraft, scooters, and power wheels up to 40 amp-hours. Ip64 protection
  • Works with all types of 6-volt and 12-volt lead-Acid batteries, including wet, gel, and AGM, or any common automotive, deep-cycle, marine, or maintenance-free battery.
  • Keep your battery fully charged without worry or overcharge. Simply plug-in and let our advanced charging technology automatically monitor and maintain your battery.
  • An optimized charge mode for safely charging and maintaining 12-volt lithium-ion batteries, and recommended with use on lithium batteries with an internal BMS.
  • One of the most advanced and safest battery chargers, including spark-proof technology, and reverse polarity protection, plus backed by our 5-year and endless Accessories.
  • Advanced diagnostics indication for damaged batteries.
See more product details

From the manufacturer

battery charger, car battery charger, smart battery charger, battery tender, battery maintainer, 12v

The NOCO Genius G4 is a 4-bank automatic battery charger and maintainer

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4 Chargers In One

Charges 6V & 12V lead-acid batteries (including AGM and more) and 12V Lithium. Repairs desulfated batteries, charges in cold conditions, and has four banks that operate independently with their own charge mode.

Diagnostics

Intuitive visual diagnostic tool for detecting reverse polarity, low-voltage or damaged batteries.

Recovery

Applies a high-voltage pulse charge when low-voltage, sulfation or lost capacity is detected.

CANbus

Automatically enables the charging port to charge CANbus systems.

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Protects against reverse polarity, overcharging, open-circuits, short-circuits, and overheating.

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Maintenance Plus

Keeps the battery fully charged without overcharging, indefinitely.

Optimization

Stabilizes internal battery chemistry for increased performance and longevity.

Interactive

Alters the charging process based on organic battery feedback.

Energy-Save

Minimizes energy consumption when full power is not needed.

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Customer Reviews
4.5 out of 5 stars
2,828
4.5 out of 5 stars
2,308
4.5 out of 5 stars
4,351
4.5 out of 5 stars
1,539
4.5 out of 5 stars
768
4.4 out of 5 stars
755
Model G750 G1100 G3500 G7200 G15000 G26000
Power 0.75A 1.1A 3.5A 7.2A 15A 26A
Battery Voltage 6V & 12V 6V & 12V 6V & 12V 12V & 24V 12V & 24V 12V & 24V
Cold/AGM Mode
12V Lithium Mode
Small Battery Mode
12V Repair Mode
12V Supply Mode
12V AGM+
JumpCharge Vehicle Starting

Product Description

NOCO Genius smart battery chargers are some of the safest and most advanced on the market. One of our best, the G4 4-Bank Battery Charger and Maintainer is designed to charge 12-volt lead-acid and lithium-ion batteries up to 40Ah. It can also effectively maintain automotive, marine, RV, powersport, lawn & garden and deep-cycle batteries. It chargers 2x faster than ordinary battery chargers, can repair damaged batteries and is designed for use with micro-hybrid start-stop vehicles and CANBUS electrical systems. Guided by an on-board microcomputer, the G4 monitors battery activity for safe and efficient charging, automatically minizes energy consumption and provides redundant levels of safety protection, including spark-proof technology, as well as reverse polarity and overcharge protection. It can remain safely connected 24/7, while its streamlined design makes it ultra-compact, portable, and incredibly lightweight. The G4 features external mounting holes and a rubberized base that avoids surface slipping and scratches, while remaining impact, UV and water resistant (IP65). Intuitive LED indicators provide visual state-of-charge feedback and diagnostic information, even when in maintenance mode. Designed for use on 120-volt 50-60Hz electrical systems and includes X-Connect battery clamps with integrated eyelet terminals, as well as a 5-year limited . DC Cord- 60-Inches (16AWG), AC Cord- 60-Inches (18AWG).Charge up to four different batteries at the same time.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

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NOCO Genius G4 6V/12V 4.4 Amp 4-Bank Battery Charger and Maintainer


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What's in the box

  • G4 4-Bank Advanced Battery Trickle Charger Maintainer
  • Battery Clamps
  • Eyelet Terminals
  • Extension Cables
  • User Guide
  • 5-Year Limited Warranty
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    PriceCurrently unavailable.$229.99$424.95-20% $99.95
    List:$124.95
    $139.95-22% $69.95
    List:$89.95
    Delivery
    Get it as soon as Tuesday, Apr 2
    Get it as soon as Tuesday, Apr 2
    Get it as soon as Tuesday, Apr 2
    Get it as soon as Tuesday, Apr 2
    Get it as soon as Tuesday, Apr 2
    Customer Ratings
    Value for money
    4.1
    4.2
    4.0
    4.3
    4.5
    4.4
    Easy to use
    4.5
    4.5
    4.4
    4.7
    4.6
    Easy to install
    4.8
    4.6
    4.3
    4.7
    4.7
    Water resistance
    4.8
    4.8
    4.5
    Weatherproof
    4.6
    4.9
    4.3
    Sold By
    Amazon.com
    Amazon.com
    Amazon.com
    Amazon.com
    Amazon.com
    input voltage
    120 volts
    120 volts
    240 volts
    120 volts
    240 volts
    120 volts
    battery charge time
    1 hours
    10 hours
    1 hours
    10 hours
    specification met
    UL, CEC, FCC
    UL, CEC, FCC
    UL, CEC, FCC
    UL, CEC, FCC
    weight
    2.7 pounds
    7.2 pounds
    16.98 pounds
    3.99 pounds
    4.17 pounds
    1.59 pounds

    Looking for specific info?

    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    677 global ratings

    Customers say

    Customers like the quality, ease of use, and battery life of the auto accessory. For example, they mention it works well, provides a full charge, and is simple to use. That said, opinions are mixed on connectivity and value.

    AI-generated from the text of customer reviews

    102 customers mention74 positive28 negative

    Customers like the quality of the auto accessory. They say it works well, is easy to use, and is reliable. Some customers also mention that the cables break at the ends. Overall, most are satisfied with the quality and portability of the product.

    "...This provides a full charge. The case is very well made, water proof and self senses the battery type when you make contact with the battery...." Read more

    "...I've had the G4 for a little while now and it does everything expected...." Read more

    "...It is easily transportable, but many of the adaptors have questionably functionality and strength/longevity...." Read more

    "...I will continue to buy NOCO products because they work well and they will take care of you if they break, albeit, you may have to be persistent to..." Read more

    33 customers mention33 positive0 negative

    Customers like the battery charging of the auto accessory. They mention that it provides a full charge, and keeps their batteries happy. The charger is versatile and can charge any battery that powers their many toys. Customers also say that it saves them from having to make trips to the barn.

    "...This provides a full charge. The case is very well made, water proof and self senses the battery type when you make contact with the battery...." Read more

    "...The ability to charge whatever type battery is a must option for me because you never have the same type of battery as much as you would like to..." Read more

    "...a lot in keeping the clutter off my workbench and provide a reliable maintenance for my batteries...." Read more

    "Absolutely one of the best maintainers on the market. This unit has also brought back some old batteries I had that were finished...." Read more

    30 customers mention30 positive0 negative

    Customers find the auto accessory easy to use. They mention it's simple to plug and play, and can maintain four batteries at once. They also appreciate the well-made instructions and the easy installation of the connectors and cables. They say it works well with multiple connections and is a wonderful time saver. Customers also say it'll charge your batteries quickly and safely.

    "...The packaging is very nice, well made and instructions are well made...." Read more

    "...Almost as big as my AGM battery but talk about smart. . .plug & play easy and can maintain four batteries at once...." Read more

    "Pros: Easy to set up, adaptable to different battery types. Cons?..." Read more

    "...Being able to charge 4 at once is a wonderful time saver and I've already noticed that how it charges seems to make all our batteries seem healthier..." Read more

    29 customers mention21 positive8 negative

    Customers like the battery life of the auto accessory. They say it charges quickly, maintains all their batteries, and keeps them alive. Some say it's convenient and easy to use. Customers also mention that it can maintain four batteries at once and is perfect for storing them during long periods when you're not using them.

    "...excited now knowing my cars will start when needed and the batteries are well cared for." Read more

    "...plug & play easy and can maintain four batteries at once...." Read more

    "...Works awesome. All four batteries are kept as maximum.Light indicators are easy to see and to identify. The multiple types of cords are great...." Read more

    "...It is underpowered to charge a car battery. I like the fact that I don't need a bunch of chargers since I have multiple smaller charging use cases...." Read more

    10 customers mention10 positive0 negative

    Customers find the weight of the auto accessory to be relatively compact, portable, and a great space saver. They also say the slim case works well and reduces clutter.

    "...plug & play easy and can maintain four batteries at once. It's big so I'll probably wall mount it and create a charging station for my batteries..." Read more

    "...Compared to the three older chargers I own, this system is relatively compact and has the ability to be mounted on a wall...." Read more

    "...types of batteries, this has been a great unit allowing me to reduce the clutter and make battery maintenance a breeze...." Read more

    "These NOCO units are the best. Very portable, rugged and reliable. I have the G1100 and G4 - both work excellent...." Read more

    21 customers mention9 positive12 negative

    Customers are mixed about the connectivity of the auto accessory. Some mention it's built with quality wiring and connectors, easy to use, and comes with a great selection of cables. They also like the ability to connect into their battery tender pieces. However, others say the connectors are extremely fragile, somewhat useless, and break at the ends.

    "...in this system; however, I've found that the included two terminal connectors are completely useless for my purposes...." Read more

    "...You get 2 battery screw connectors for more permanent or long term terminal connections and you get two spring loaded alligator terminals for..." Read more

    "This charger works fine, but the cables break at the ends they break off into the opposite cable and they are stupid expensive, way overpriced, I..." Read more

    "...The charger comes with two 10' extension cords. (All cords have polar connectors for the charger end so you can't plug them in wrong.)..." Read more

    20 customers mention11 positive9 negative

    Customers are mixed about the value of the auto accessory. Some mention it's well worth the money, while others say it'd be stupid expensive.

    "...from my motors, you can buy additional extension cords for a very reasonable price, you can also daisy chain the extension cords to meet you..." Read more

    "...break off into the opposite cable and they are stupid expensive, way overpriced, I will end up making my own, not appreciated, I have over $300 in..." Read more

    "...Great product, great value." Read more

    "...It is a little more expensive, but seems to be better quality than the other one...." Read more

    9 customers mention0 positive9 negative

    Customers are dissatisfied with the ring terminal size of the auto accessory. They mention that the terminals are too small for the threaded battery posts, and the eyelet cables that are included are too short for boat or car batteries. Some say that the rem terminals do not fit on any of their marine batteries.

    "...They are not the correct size for any battery I have attempted to charge thus far (four 12V norm, three 6V norm, and one 12V lithium)...." Read more

    "...The problem is the eyelet cables that are included are too small for boat/car batteries. I had to drill them out to make them work...." Read more

    "...for screwing on manually with a nut to your batteries but they don't fit a standard 12V, so if you want to use four banks, you need to buy two more..." Read more

    "...The ring terminals are too small for the threaded battery posts. The battery posts measure 7.84mm/od. The ring terminals are only 6.53mm/id." Read more

    I like it but problems less than a year.
    3 Stars
    I like it but problems less than a year.
    I bought this charger to maintain my lawn and garden equipment. Small 12v batteries and to keep my generator battery ready for an outage.The 4 port noco g4 genius individually charges various size batteries simoulataneously or individually, then keeps them charged.I like it.:::July 6, 2018:::Today I found the charger in a non operational state. Cycled the power button with no change. Verified 120vac supply. Same voltage as the unit had installed on. It performed properly prior to today.Contacted noco via email seeking support.Continued troubleshooting. Eventually 2 banks began working, 2 and 4. 1 and 3 still inoperational.More to come.:::July 9 2018:::Recieved email from customer support requesting detailed explanation, proof of purchase and serial number. An RMA is pending this information.This unit is less than a year old. Purchased october 2017.:::7-18-2018:::Returned the unit to the RMA location in AZ. It was recieved on friday 7-13-18. The company collected the unit on mon 7-16 and it was input to warranty on 7-17.An exchange of emails presented no updates to the status of the charger. An online chat with a noco rep indicated that the status of the charger might be known by the end of the week.Really? It takes a week to troubleshoot and identify the issue and determine if the unit requires replacement or can be repaired?I did not buy this thing for it to sit in the warranty department. Now they have my equipment and my money. Im not real happy at this point.7/20/18Without notice, I recieved the noco genius gen4 On-Board charger NIB this morning. Its a much heavier unit at first glance. The terminals are #12 ring style connections. Heavier duty. Im guessing I get the remaining warranty applied to this unit. This charger sells for 299. On amazon. I will get it all connected and go from there. So far so good.
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    Reviewed in the United States on February 7, 2019
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    Top reviews from other countries

    Marc Mousseau
    5.0 out of 5 stars Peace of mind!
    Reviewed in Canada on November 23, 2019
    Russell s
    5.0 out of 5 stars Trickle charges 4 batteries at once.
    Reviewed in Canada on May 26, 2019
    Mark T
    4.0 out of 5 stars Worth it!
    Reviewed in Canada on November 9, 2020
    Brad
    5.0 out of 5 stars Love the Genius NOCO G4 chargers
    Reviewed in Canada on November 12, 2019
    One person found this helpful
    Report
    j.j.simoneau
    5.0 out of 5 stars very good product
    Reviewed in Canada on January 17, 2023