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NOCO Genius Smart Battery Charger - AC to DC - 6V/12V - 5 Amp

NOCO Genius Smart Battery Charger - AC to DC - 6V/12V - 5 Amp

Item # 329-GENIUS5
Our Price: $69.95
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Battery Charger
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NOCO Battery Charger - 329-GENIUS5
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Compact smart charger draws power from a wall outlet to charge and maintain batteries on cars, motorcycles, lawnmowers, ATVs, tractors, trucks, SUVs, and boats. Force mode revives dead batteries. Charges lead-acid and lithium-ion batteries. 1-800-940-8924 to order NOCO battery charger part number 329-GENIUS5 or order online at Free expert support on all NOCO products. Great prices and Fastest Shipping for NOCO Genius Smart Battery Charger - AC to DC - 6V/12V - 5 Amp. Battery Charger reviews from real customers.
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NOCO Battery Charger - 329-GENIUS5

  • ATV
  • Boat
  • Car/Truck/SUV
  • Generator
  • Jet Ski
  • Lawn Mower
  • Motorcycle
  • RV/Camper
  • Snowmobile
  • Trolling Motor
  • Battery Charger
  • 6V
  • 12V
  • NOCO
  • Wall Outlet to Vehicle Battery
  • 120 Ah
  • Charges/Maintains

Compact smart charger draws power from a wall outlet to charge and maintain batteries on cars, motorcycles, lawnmowers, ATVs, tractors, trucks, SUVs, and boats. Force mode revives dead batteries. Charges lead-acid and lithium-ion batteries.


  • AC-to-DC smart charger quickly charges and maintains a battery
    • Perfect for charging a car, motorcycle, lawnmower, ATV, tractor, truck, SUV, or boat
  • Multiple battery profiles let you charge a variety of battery types at different voltages
    • 6V Modes - normal
    • 12V Modes - normal, AGM, lithium-ion, and repair
    • Force mode provides a constant charge to revive dead batteries
  • Multi-stage charging algorithm charges 2x faster than traditional chargers without overcharging
    • Analyzes battery condition to provide a customized charge
    • Built-in battery desulfator restores lost battery capacity
  • Precision needle-nosed battery clamps are spark-proof and have reverse polarity protection
    • Built-in 10-amp fuse protects electronics from dangerous overloads
  • Simple operation with mode button and LED indicators
    • Auto-memory feature remembers the last charge mode if power is lost
  • Snap-fit bracket and hook-and-loop strap secure unit near battery
  • Durable resin housing is rugged and water resistant - perfect for on- or off-board applications
  • X-Connect series accessories (sold separately) provide connections for additional applications


  • Application: 6V and 12V batteries up to 120 amp-hours
  • Battery types supported: wet cell, gel cell, enhanced flooded, maintenance-free, AGM, and Lithium-ion
    • Lithium-ion batteries must have battery management systems (BMS)
  • Maximum charging amperage: 5 amps
  • Battery clamp cord length: 77"
  • AC cord length: 71"
  • Input voltage: 120 - 240 VAC (50 - 60 Hz)
  • Maximum power consumption: 75 watts
  • Low voltage detection rating: 1 volt
  • IP rating: 65
  • Operating temperature: -4 F to 104 F
  • Dimensions: 6-3/8" long x 2-15/16" wide x 1-15/16" thick
  • Weight: 1.5 lbs
  • 3-Year limited warranty

NOCO GENIUS5 Smart Battery Charger Dimensions

The NOCO Genius 5-amp smart charger quickly charges and maintains your 6V and 12V lead-acid and lithium-ion batteries, using a standard household outlet. Rated for 6V and 12V batteries up to 230 amp-hours, it's a great charger for cars, motorcycles, lawnmowers, ATVs, tractors, trucks, SUVs, and boats. With 5 selectable battery profiles, multi-stage charging, and advanced safety features, this Genius smart charger makes it easy to keep your batteries in peak condition. There's even a Force Mode feature for charging dead batteries with 0-volts.

NOCO GENIUS5 Genius Battery Charger Operation

This Genius smart charger removes the frustration of having to own multiple devices to charge different battery types and vehicles. Just attach the battery clamps to the vehicle's battery terminals, select a charging mode to match your application, and wait for the LED indicator to signal that the battery is completely charged. It's that simple.

User-Friendly Interface with LED Indicators

NOCO GENIUS5 LED Charging Indicators

This Genius smart charger was designed to provide a simple, user-friendly experience. The mode button allows you to easily cycle through the unit's charge settings. Back-lit LED indicators let you verify that the unit is operating correctly, and they allow it to be easily operated at night. These indicators signal the unit's charge status, selected charging mode, and alert you to potential performance issues or errors.

NOCO GENIUS5 Smart Diagnostics Troubleshooting Explained

These indicators allow you to quickly identify a problem with the battery or connection. So you don't have to waste time guessing if the battery voltage is too high or too low for your selected mode, or worry about damage from a reversed polarity connection to a battery.

6 Battery Charging Modes

This Genius 5-amp smart charger has 6 selectable charging modes that let you quickly switch between charging different lead-acid and lithium-ion battery types at different voltages. Traditional battery chargers generally only work with a specific voltage or battery type, like lithium-ion or AGM batteries, or only in special circumstances like charging in cold environments. This Genius smart charger gives you the versatility to tackle different battery types and charging situations in one charger.

NOCO GENIUS5 Automatic Battery Charger Charging Modes Explained

The image above details the available charging profiles. The charger works with 6V and 12V wet cell, gel cell, enhanced flooded, calcium, maintenance-free, AGM, and 12V lithium-ion batteries with battery management systems (BMS).

NOCO GENIUS5 Force Mode for Charging Zero Voltage Batteries

The Genius 5-amp can detect and charge batteries that have been drained to 1-volt. And by activating the Force Mode, the charger can even charge dead batteries with 0-volts. Traditional chargers can't detect a battery when the voltage drops below a certain level. To activate Force Mode hold the mode button down for 5 seconds.

Genius Precision Battery Clamps

NOCO GENIUS5 Genius Precision Battery Clamps

The needle-nosed battery clamps included with this Genius smart charger are designed to easily connect to battery terminals of all shapes and sizes. Unlike typical, plastic battery clamps, these clamps are constructed entirely of metal, ensuring maximum conductivity. The clamps are covered with an over-molded plastic housing, which makes them easy to operate even with work gloves on. A built-in 10-amp fuse protects your connection against dangerous overloads.

NOCO GENIUS5 Battery Clamps with Eyelet Connectors

1/4" Eyelet connectors can be unbolted from the clamps for direct mounting to terminals on hard-to-reach batteries. The lie-flat design ensures maximum contact with terminals to optimize current transfer.

Quickly Charge and Maintain Batteries from 120VAC Power Source

NOCO GENIUS5 AC Plug for Wall Outlet Charging

This Genius smart charger plugs into an available wall outlet to quickly charge and maintain your battery. High-frequency switch-mode technology converts AC power into safe DC power to fully charge batteries. An onboard microcomputer monitors and controls this charging process to minimize power loss and maximize efficiency. The included mounting bracket with hook-and-loop strap lets you mount the unit in an enclosed compartment, garage, or workspace.

NOCO GENIUS5 Charging Times for Battery Sizes

The table above provides a quick reference for how long it will take the unit to charge some different battery sizes.

Rugged Weatherproof Design

NOCO GENIUS5 Rugged Weatherproof Housing

The Genius5 smart charger comes with over-molded connection points to protect the unit from dirt, dust, and water. The unit has an IP65 rating, meaning the housing is considered "dust tight" and protected against water sprayed from a nozzle. A durable X-connect plug ensures a weathertight connection when attaching the clamps to the charger.

The housing is made from tough Lexan resin that protects the internal electronics against impacts. The unit can handle being dropped, kicked over, and just about anything else your day brings.

Interchangeable X-Connect Accessories

NOCO GENIUS5 X-Connect Accessories for Versatile Charging Solutions

This Genius smart charger features a unique X-Connect plug that lets you disconnect the battery clamps and attach other X-Connect accessories (all sold separately) for versatile plug-and-play charging solutions. Add an extension cord to increase your connections reach, or use the 12V female plug to connect and power 12V accessories. Access your vehicle's battery through charging ports with the OBDII connector, or the 12V male plug. With a large variety of available accessories this battery charger can be outfitted to meet your application's specific charging needs.

GENIUS5 NOCO Smart Battery Charger and Maintainer - AC to DC - 6V/12V - 5 Amp - 75 Watt

Replaces part number: G3500

Installation Details 329-GENIUS5 Installation instructionsAlternate Instructions 329-GENIUS5 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

NOCO Genius Smart Battery Charger - AC to DC - 6V/12V - 5 Amp - 329-GENIUS5

Average Customer Rating:  4.9 out of 5 stars   (132 Customer Reviews)

Compact smart charger draws power from a wall outlet to charge and maintain batteries on cars, motorcycles, lawnmowers, ATVs, tractors, trucks, SUVs, and boats. Force mode revives dead batteries. Charges lead-acid and lithium-ion batteries.


Works as advertised. Have used it to restore a 12v lithium 100ah battery which was allowed to go well below the recommended level of discharge. The compact size is also a big plus.


Always excellent


Excellent selection of products, great prices and fast delivery. Can't beat etrailer website for service.


heavy duty, really solid product, can tell its built with quality

works great, costs more, heavier duty than most cheap electronics, and holds up nicely
steve - 10/25/2021


Very fast delivery, product as described, another great experience with etrailer. Thanks!


very satisfied with this purchase. I had a GM battery at 81% on standby, it took just a few minutes to fully charge using this device. Now is on maintenance mode fully charged and ready to go.


Best charger. No regrets at all. Very good quality,


I now have 4 NOCO genius chargers. Easy to use for maintaining batteries!!


First off this product is GREAT! I bought a few and returned them. This one I love. It REALLY WORKS. Also, etrailer is AMAZING! I have never used them before but going forward it will be 1 of the 1st sites I go look at. most of the time I am an [online retailer] guy but with shipping being 1 month out I looked elsewhere. etrailer even upgraded my shipping!!!! seriously, this was a GREAT experience and I will be a repeat customer.


Just received item. Customer service was excellent. Items arrived earlier than promised which is great. When I use the charger I'll provide an update.







Review from a similar NOCO Genius in Battery Charger

For over a year now this little NOCO charger has kept the starting battery ready to go on our diesel backup generator. Before the NOCO we had to jump start it almost every time.


Review from a similar NOCO Genius in Battery Charger

Great equipment. Robust construction so it will last. Does agreed job of keeping camping trailer charged.


Review from a similar NOCO Genius in Battery Charger

Awesome little charger. I installed this permanently to the inside of my trailer for easy use.


Review from a similar NOCO Genius in Battery Charger

Excellent addition to our Scamp trailer stuff. Etrailer advice and service was excellent.

Great - everything Id hoped for
Ralph - 08/02/2022


Review from a similar NOCO Genius in Battery Charger

Great charger does everything I expected from charging my batteries


Review from a similar NOCO Genius in Battery Charger

This charger has served me well to keep my motorhome batteries charged.

This battery charger has been very handy to charge my trolling motor for my kayak.
Andy S - 04/30/2022


Review from a similar NOCO Genius in Battery Charger

Great product used from previous purchase, no damage to batterys, very well packaged, prompt delivery.


Review from a similar NOCO Genius in Battery Charger

Contacted about charging K2 Energy Lithium Ion marine batteries. They took the time to contact NOCO Genius chargers to get me the correct answers. NOCO said absolutely that this would be the correct charger for lithium ion marine batteries.

I am now confident that my investment of Lithium batteries will get the correct charge they require. The NOCO genius charger is lighter and smaller than my previous charger allowing more room and less weight in my boat.


Review from a similar NOCO Genius in Battery Charger

It is an awesome product. Has worked great for me.


Review from a similar NOCO Genius in Battery Charger

It has saved us money now that we know you can't let the battery go died. This set up is a life saver at keeping our battery charged

Show More Reviews

See what our Experts say about this NOCO Battery Charger

  • Can Two 12 Volt Batteries Connected in Parallel be Charged Through a Switch Using a NOCO Charger
    You can charge 2 batteries when they are connected in parallel using a battery charger such as # 329-GENIUS5. However, it will take longer to charge the batteries when they are connected compared to if you were to charge each one separately. The best battery charger to use for charging batteries in parallel would be # 329-GENIUS10. It has a higher amperage output and will charge faster. I have included a link to our FAQ article on battery chargers for you.
    view full answer...
  • Difference Between NOCO Genius Smart Battery 5 Amp and 10 Amp Chargers
    The amp rating is really the only difference between the NOCO Genius Smart Battery Charger 5 Amp # 329-GENIUS5 and the 10 Amp # 329-GENIUS10. The 5 amp weighs in at 1.5 ls and works with batteries up to 120 amp-hours while the 10 amp weighs in at 3.3 lbs and works with batteries up to 230 amp-hours. So the 10 amp version is for a bigger application but that's it. I don't know what battery you have in your Yamaha but you can use the specs I mentioned above as a guide. There should be an...
    view full answer...
  • Switching From 12 Volt Batteries To 6 Volt Batteries Blowing Fuses On Camper Trailer
    If you have a 12 volt system on your camper, you will need to wire your 6 volt batteries (in series), like the attached drawing shows. You would need to run a jumper from the positive side of one battery to the negative side of the other battery. This would provide the 12 volts needed. If you have wired the 6 volt batteries (in parallel) as the 12 volt batteries were probably run, you are not providing enough current for your camper, causing the draw to blow the fuses. If you have a...
    view full answer...
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  • How Long Does it Take # 329-GENIUS5 Charger to Get Back to 100 Percent
    In our experience if your battery is healthy you should get back to full charge level using the NOCO Genius Battery Charger and Maintainer # 329-GENIUS5 in no more than a few hours. If it was at 100 it is likely cycling through the maintenance and that requires losing power to charge back up within certain parameters so it doesn't stay at 100 percent and lose effectiveness over time.
    view full answer...
  • Is a Back Up Battery for a Boat Sump Pump Needed in Addition to the Trailer Battery
    If you will be leaving the boat in the water then having a battery back up would be recommended. Or, at the very least, store a spare battery that is not connected to anything in case it is needed. If the boat will not be stored in the water then leaving the pump connected to the regular trailer battery will be fine. Using a charger like # 329-GENIUS5 is the best way to charge and maintain a 12 volt battery. I own one of these chargers and it works great; much better than a trickle charger...
    view full answer...
  • Battery Charger Recommendation for 12 and 6 Volt Batteries
    What you need is an actual battery charger like # 329-GENIUS5. I own this charger as well, as do several of my co-workers, and it works beautifully. The great thing about this battery charger is that it works to recondition the battery while charging it and it will not overcharge the battery like traditional trickle chargers. For the time it takes to recharge a battery it depends on the amp hour rating on the battery. This charger is much faster than others it is compared to because of...
    view full answer...
  • Wiring a Battery, Power Inverter, and Charger on a 1980 Coleman Tent Trailer
    First, the wiring from a trailer connector will provide a maintenance charge to a trailer battery, but will not up-charge it. If that is sufficient for your needs then you would have the trailer connector, trailer side, 12 volt circuit attached to your charger. The charger would then connect to the battery, and the inverter would connect to the battery. Bascially, you will have the 12 volt power wire go to the positive of the charger. Ground the charger to the trailer frame. The positive...
    view full answer...
  • Will NOCO Battery Charger Charge Battery Without Damaging It?
    If the car battery is merely discharged but otherwise in good repair, using a NOCO charger will not damage it. NOCO chargers will not over charge a battery, once full charge is reached, the charger switches to pulse maintenance, which maintains the charge rather than applying full power to the battery. A charger like the NOCO Genius Battery Charger and Maintainer # 329-GENIUS5 would be best suited for a car battery. The charger is suitable for deep-cycle batteries.
    view full answer...
  • Can the 329-GENIUS5 Battery Charger be Used to Charge a Deep Cycle Car Battery
    The charger you would want to use for car batteries is the NOCO Genius Battery Charger and Maintainer # 329-GENIUS5, that you have referenced. It is designed specifically for 12 volt deep batteries and works well with deep cycle options.
    view full answer...
  • Is it Safe to use a Noco Battery Charger for Long Periods of Time on a Stored Vehicle
    You should have no problem setting this battery charger and leaving it for months on end, unattended. The NOCO Battery Chargers work very differently than the old, traditional battery tenders. The old tenders used a trickle charge. Basically they constantly applied a little bit of power. This wastes electricity and can lead to some lead acid batteries overflowing, which is a big problem. The charger and maintainers do not trickle charge. Instead they detect that the battery has lost some...
    view full answer...
  • How Does Battery Bank Wired in Parallel Attach to Battery Charger Lines
    When a 2 battery bank is wired in parallel there is a main positive and ground circuit that would run to supply power the trailer/vehicle. Those two circuits are where you attach the positive and ground of the charger like the NOCO # 329-GENIUS5 that you referenced.
    view full answer...
  • How To Charge 12v Batteries Wired in Parallel
    In order to charge your batteries wired in parallel with the NoCo Genius # 329-GENIUS5 you'll want to connect the positive charge line to the positive terminal of the first battery and the negative line to the negative terminal of the opposite battery. This is an AC to DC charger so it will work directly from a wall outlet for added convenience.
    view full answer...
  • Maintain Car Battery While In Storage
    The NOCO # 329-GENIUS5 Genius 5 Smart Battery Charger is the perfect choice. Simply plug it into your normal wall electrical outlet and hook up the other end to your car battery. The smart charger will charge your battery, then maintain it automatically. When charging is not needed, the unit goes into standby until it is time to charge some more.
    view full answer...
  • Can Generator Charge Deep Cycle Battery of Trailer
    You'd need to use a 12 volt charger like # 329-GENIUS5 plugged into your generator and then attached to your deep cycle battery. This will allow you to charge the battery pretty easily. Your generator should have more than one outlet so you could potentially run the furnace and the charger at the same time. Or if not you could use a multi-plug plugged into the single outlet.
    view full answer...
  • Should RV Get Winterized If its Going to be Used Every Weekend
    You're in a tough spot if you plan to use the RV a lot during the winter months. The problem is that you have to winterize the water system so that the pipes don't freeze, but you'd be having to undo the winterizing process every time you use the trailer. Best option would be to store it during the week somewhere indoors that will be above freezing so that you can get by without winterizing the system.
    view full answer...
  • Does Battery Amperage Double When Batteries are Wired In Series or Parallel
    When you wire two batteries in series the voltage doubles but the amperage stays the same. So two 6 volt, 10 amp batteries in series is still 10 amps. It's when you wire batteries in parallel (voltage stays same) that the amperage doubles.
    view full answer...
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  • Recommended AC to DC Battery Charger for Lithium Ion Battery
    The NOCO Genius Battery Charger part # 329-GENIUS5 is what I recommend for a 100 amp hour lithium ion battery. It has multiple charge cycles for optimal performance and is super easy to use.
    view full answer...
  • Can the NOCO Genius Smart Batter Charger 329-GENIUS5 Be Used for Two 12 Volt Batteries
    Yes, you can still use a single bank battery charger to charge both batteries like the NOCO Genius Smart Batter Charger part # 329-GENIUS5 just be sure to pay attention to the amp hour capacity and the limit for this model is 120 amp hours.
    view full answer...
  • Can the Breakaway Battery Charger on a Car Hauler be used to Charge a Large Winch Battery
    Using the breakaway battery charger to charge another battery on the trailer is not recommended. The larger battery you are using to operate the trailer winch would take an extremely long time to charge with a breakaway charger and would likely never charge fully with the limited amount of time the trailer is connected to the vehicle, even if towing long distances. The breakaway battery may not be charged sufficiently in this situation either. The best bet for charging the winch battery...
    view full answer...
    Image 1 for
  • Should All Batteries in Series be Replaced at the Same Time
    It is strongly stated that you should not mix old and new batteries wired in series. Doing so will reduce overall performance and may cause battery leakage or rupture and could also damage the accessories that run off of the batteries as well.
    view full answer...
  • How Should 2 6-Volt Batteries Connect to 12 Volt Inverter
    I attached a picture that shows how 6 volt batteries need to be wired to be able to connect to a 12 volt inverter. You would need the output to be 12 volts and not 6. I recommend the charger # 329-GENIUS5 for your application because it can be used for your batteries individually or banked together as we've been discussing.
    view full answer...
    Image 1 for
  • Is There Benefit to Having Multiple Batteries Wired in Parallel on Trailer
    Having a bank of batteries gives you a much longer battery life than a single battery. That's really all you gain with a battery bank that has 12 volt batteries wired in parallel.
    view full answer...
  • How to Increase Cold Cranking Amps of Two 12 Volt Batteries
    In order to achieve maximum cranking amps you will want to wire your two 12 volt batteries in parallel (see photo). The output of 12 volts will remain the same but the capacity and cranking amps will become the sum of the two batteries. For example, if battery A has a 600 cold cranking amp (CCA) rating and battery B has a 600 cold cranking amp (CCA) rating then the batteries wired in parallel will produce 1,200 cold cranking amps (CCA).
    view full answer...
    Image 1 for
  • Can NOCO Genius Battery Charger and Maintainer Charge Batteries Wired in Parallel
    Our battery chargers like the NOCO Genius Battery Charger and Maintainer # 329-GENIUS5 that you referenced can be used to charge a battery bank wired in parallel as long as the output voltage is 12 volts. You'd run the charge wires of this to the main output terminals you use on both batteries for the power and ground and you'd be set.
    view full answer...

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