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NOCO Genius Mini On-Board Battery Charger - AC to DC - Waterproof - 1 Bank - 12V - 4 Amp

NOCO Genius Mini On-Board Battery Charger - AC to DC - Waterproof - 1 Bank - 12V - 4 Amp

Item # 329-GENM1
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NOCO Genius Mini On-Board Battery Charger - AC to DC - Waterproof - 1 Bank - 12V - 4 Amp Wall Outlet to Vehicle Battery 329-GENM1
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Submersible, mini on-board smart charger draws power from a wall outlet to charge and maintain a 12V battery at 4-amps. Fully-sealed, waterproof construction is ideal for marine applications. Saltwater tested and ignition protected for safety. Call 800-298-8924 to order NOCO battery charger part number 329-GENM1 or order online at etrailer.com. Free expert support on all NOCO products. Guaranteed Lowest Price and Fastest Shipping for NOCO Genius Mini On-Board Battery Charger - AC to DC - Waterproof - 1 Bank - 12V - 4 Amp. Battery Charger reviews from real customers.
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NOCO Battery Charger - 329-GENM1

  • Boat
  • Trolling Motor
  • Generator
  • Electric Vehicle
  • Industrial Equipment
  • Battery Charger
  • NOCO
  • 12V
  • Wall Outlet to Vehicle Battery
  • Charges Only
  • 120 Ah

Submersible, mini on-board smart charger draws power from a wall outlet to charge and maintain a 12V battery at 4-amps. Fully-sealed, waterproof construction is ideal for marine applications. Saltwater tested and ignition protected for safety.


  • Mini on-board AC-to-DC smart charger quickly charges and maintains a 12V battery
    • Perfect for boats, trolling motors, generators, electric vehicles, and industrial equipment
  • 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
  • Heavy-duty 3/8" eyelet connectors provide maximum contact with terminals
    • Built-in 15-amp fuse protects electronics from dangerous overloads
  • Completely sealed, waterproof design is fully submersible - perfect for marine applications
    • Tested to resist saltwater corrosion
  • Meets USCG-33 CFR 183.410 requirements for ignition protection
  • AC port plug (sold separately) creates a connection point for easy access to AC power


  • Application: 12-volt lead-acid batteries rated up to 120 amp-hours
  • Battery types supported: wet cell, gel cell, AGM, enhanced flooded, and maintenance-free batteries
  • Number of battery banks: 1
  • Maximum charging amperage: 4 amps
  • Eyelet cord length: 75-1/2"
  • AC cord length: 72"
  • Working voltage: 70 - 130 VAC (50 - 60 Hz)
  • IP rating: 68
  • Dimensions: 6-5/8" long x 5" wide x 2-7/16" thick
  • Weight: 3.3 lbs
  • 5-Year limited warranty

NOCO GENM1 Mini On-Board Marine Battery Charger Diagram

The rugged NOCO Genius GENM1 mini on-board smart charger quickly charges and maintains a 12-volt lead-acid battery. The battery bank efficiently charges deep cycle and starter batteries up to 120 amp-hours. It's great for boats, trolling motors, generators, and a wide range of electric vehicles and industrial equipment. With a fully submersible design, the GENM1 was built to handle harsh marine environments, while keeping your batteries in peak condition.

Multi-Stage Smart Charging Technology

The NOCO GENM1 smart charger uses an 8-stage charging cycle to quickly and efficiently charge your battery. This ensures that the battery safely reaches maximum capacity without being overcharged.

NOCO GENM1 Genius Battery Charger Advanced Smart Charging Technology

In the first step of the charging process, the charger will analyze the battery's condition and state of charge. The charger then uses this data to diagnose the battery's health and ensure it can be safely charged. If the battery is deeply discharged or sulfated, the charger will automatically enter the recovery stage to repair the battery by pulsing small amounts of current.

Once the unit has determined that the battery's condition is stable, it will initialize the charging process by providing a constant, gentle charge. The charger gradually increases the charge during the bulk stage and quickly charges the battery to 80-percent capacity.

As the battery nears full charge, the GENM1 enters the absorption stage and delivers small amounts of current to limit battery gassing and safely bring the battery to 90-percent capacity. The charger will then begin optimization of the battery, bringing it to full capacity and optimizing it for increased run time and performance.

The final step of the charging process, maintenance, monitors the battery for drops in power and supplies the correct current to keep it fully charged. If a drop in voltage is detected, the charger will begin the optimization cycle to keep the battery fully charged.

Heavy-Duty Eyelet Connectors

NOCO GENM1 Heavy-Duty Eyelets

A set of 3/8" eyelets connects the GENM1 to your battery. Over-molded connection point stands up to heavy usage and keeps connections safe from the elements. Built-in 15-amp fuse protects connection against dangerous overcurrent.

Quickly Charge and Maintain Batteries from 120VAC Power Source

NOCO GENM1 AC Plug for Wall Outlet Charging

The GENM1 plugs into an available wall outlet to quickly charge and maintain a 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. Included hardware lets you mount the unit in an enclosed compartment, garage, or workspace.

Rugged Submersible Design

NOCO GENM1 Waterproof and Ignition Proof Design

The GENM1 was built to handle extreme marine conditions. The unit has an IP68 rating, which means it can handle being fully submerged in water, and it's protected against solid particles like dust or sand. Its ignition protected for safe and worry-free operation around marine engine compartments and fuel tank spaces. Saltwater won't cause issues either. The charger has been thoroughly tested to resist corrosion.

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

AC Port Plug for Plug-and-Play Charging

NOCO GEN3 GCP AC Port Accessory

Available AC port plugs (sold separately) from NOCO let you easily setup your GENM1 charger for plug-and-play charging with any extension cord. The plug creates a "pass through" AC charging port on a surface, so you can quickly connect to the charger when it's mounted inside a compartment on a truck, boat, trailer or RV. This allows you to easily access the charger for charging engine block heaters, trolling motors, batteries, and other equipment. A snap-fit cap creates a watertight seal to protect the connection whenever you're done.

GENM1 NOCO NOCO Genius Mini On-Board Marine Smart Battery Charger - Submersible - AC to DC - 1-Bank - 12V - 4 Amp

Installation Details 329-GENM1 Installation instructionsAlternate Instructions 329-GENM1 Installation instructions

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Customer Reviews

NOCO Genius Mini On-Board Battery Charger - AC to DC - Waterproof - 1 Bank - 12V - 4 Amp - 329-GENM1

Average Customer Rating:  5.0 out of 5 stars   (1 Customer Reviews)

Submersible, mini on-board smart charger draws power from a wall outlet to charge and maintain a 12V battery at 4-amps. Fully-sealed, waterproof construction is ideal for marine applications. Saltwater tested and ignition protected for safety.

- 329-GENM1

I received the battery charger in a timely manor. Installed it the day I got it on my cargo trailer conversion to toy hauler. It works great so far, put the product had high reviews. I also put in a order yesterday and as usual the order was shipped the same day. 643403


Ask the Experts about this NOCO Battery Charger

  • Battery Charger Option for a 2002 Corvette C5 Red Top Optima Battery and Deep Cycle Trailer Battery
    After doing some research on the red top Optima Batteries for your 2002 C5 Corvette, the CTEK 0.8 Universal Battery Charger for Small 12 Volt Batteries # CTEK56865 will maintain a charge on your vehicle battery. This charger should also be able to maintain the charge on your deep cycle trailer battery as long as it has a capacity less than 100 amp hours. This charger can maintain batteries with capacities up to 100 amp hours, but will only charge batteries with capacities from 1.2 to 32...
    view full answer...
  • Size of Screws Included with NOCO Genius Mini On-Board Battery Charger # 329-GENM1
    The NOCO Genius Mini On-Board Battery Charger # 329-GENM1 includes four self-tapping #8 x 1" Phillips Pan-Head screws. I have attached a short video review on this system that you can also take a look at.
    view full answer...
  • Can Different Capacity Batteries Be Charged Together
    Batteries should always be charged individually. If you had two identical batteries but one is new and the other is a year old and has been through many charge/depletion cycles, the new one will pull in more of the charging power because it is in better shape. Batteries age and become less able to accept a charge effectively. Batteries connected together can result in one slowing the rate of charge on the other. Batteries with very different Amp-Hour ratings, like a 100-Ah and a...
    view full answer...
  • What Does a Flashing Green Light On the Genius GEN Mini Battery Charger Mean
    The blinking green light on the NOCO Genius Mini On-Board Battery Chargers like part # 329-GENM1 indicates there is an error. In order to fix this error you will need to follow the list of steps which are laid out for you in the troubleshooting section of the manual which I have attached for you below. If it turns out the unit is faulty then I have attached a list of our battery charger options for you to look through for replacement.
    view full answer...
  • AC to DC Converter To Power Running Lights of Camper Trailer When Parked
    You could use the # 329-GENM1 plugged into either your generator or shore power outlet to provide you with a 12 volt power source for the running lights. You'd just need to splice in the connectors of the converter to your running light circuit and when evert it's plugged in your running lights would be on.
    view full answer...
  • Adapter to Go From AC Generator Power to DC Power For Lights on Boy Scout Trailer
    Yes, we have the NOCO adapter part # 329-GENM1 which would plug into a generator outlet and give you a DC power setup.
    view full answer...
  • Connecting Battery Charger to Trailer with Four 6V Batteries for 12V Power Output
    To connect a battery charger like the NOCO Genius Mini On-Board Battery Charger # 329-GENM1 to four 6V batteries connected for 12V output you will connect the charger to the first battery positive terminal and the negative of the fourth battery. I've attached a photo to assist. You could also use a more versatile charger like the NOCO Genius UltraSafe Battery Charger and Maintainer # 329-G4, which is designed for use with both 6V and 12V batteries.
    view full answer...
  • Can NOCO Genius AC-Powered Mini Battery Charger 329-GENM1 Be Left Connected While Battery is In Use
    Yes, since the NOCO Genius AC-Powered Mini On-Board Battery Charger # 329-GENM1 outputs up to 4-amps it will be fine to leave it connected to your battery while you operate a few low-power lights and a water pump that pulls 1.4-amps. While these devices are in use the charging speed may be reduced. The NOCO Mini is compatible with wet cell, gel cell, AGM, enhanced flooded, and maintenance-free batteries up to a 12-Ah rating and it has built-in protection against short circuits, open...
    view full answer...
  • Recommended Battery Charger and Maintainer for 2008 Porsche Boxster
    For you 2008 Porshe Boxster I recommend the CTEK Multi 12-Volt battery charger part # 329-GENM1. It constantly monitors and maintains your 12V battery when hooked up. It prevents any kind of overcharge by switching to a maintenance pulse, which most trickle chargers won't do. I've used CTEK chargers for a wide variety of applications, cars, trucks, lawnmowers, and ATVs, and have always been happy with the results. I really like that it comes with 2 sets of cables to hook up to the battery;...
    view full answer...
  • Using Trailer Lights as Low Voltage Driveway Lights
    You can use trailer lights as low voltage driveway lights, you simply need to have a converter like what is built into the NOCO Genius Mini On-Board Battery Charger # 329-GENM1 to convert your AC power to DC power for the trailer light compatibility. You will simply then use a switch or motion detector to be hardwired to that AC outlet the charger/converter and trailer lights are connected to.
    view full answer...
  • Installing 7-Way and Wiring for Auxiliary Battery Charging
    For your 2003 Ford E150 hi top conversion van, because you have a 4 way connector, you can use the Adapter 4-Pole to 7-Pole and 4-Pole # 37185. This will connect to your 4-way and then you can simply connect the white ground wire to a bare metal surface and then use # 10-1-1 sold by the foot to connect the black wire on the connector to circuit breaker # 9510 and then to the positive terminal on your vehicle battery. This will get your vehicle ready to send the 12V power. Then on your...
    view full answer...
  • How to Add a Battery to an Enclosed 6x12 Cargo Trailer for Powering Interior Lights.
    So the right way for you to do this will depend on how often you're going to use the lights and how many of them there are. If a trailer isn't equipped with a battery, the interior lighting is frequently tied into the running lamp circuit. Turn on the vehicle's running lights and boom, on come the lights. This is the simple way to go. You'd obviously need the truck there and plugged in to make that happen. You'd also want to run the truck from time to time so the alternator keeps the vehicle...
    view full answer...
  • Recommended Camper Battery Charger for a 2015 Chevrolet Silverado 3500HD w/Factory Tow Package
    It sounds like you are trying to charge the batteries of your camper with the Silverado's 7-way trailer plug. As long as you wire the 7-way connectors the same function to function this will provide you with a maintenance charge for your slide in camper but it will not re-charge the batteries. If you need more than just a maintenance charge then I recommend a battery charger like the NOCO Genius Mini # 329-GENM1. This can connected to the campers batteries with the ring terminal attachment...
    view full answer...
  • How to Wire an Electric Winch on a Car Hauler Trailer
    Unfortunately the ~16 gauge wires used on a 4-pole trailer connector would deliver only a fraction of the power required to run a winch. There are two basic alternatives, as you stated. You could run a cable from the battery back to the truck, terminating in a quick disconnect which would plug into a quick disconnect installed on the trailer mounted winch, using a wiring kit like # BDW20207. The second option would be to have a secondary battery installed on the trailer to power...
    view full answer...
  • Can Powerhouse TC2 2-Amp Trickle Charger Be Used for 12V Car/Camper Battery
    The NOCO Genius Smart Battery Charger # 329-GENIUS2D is suitable for 12V batteries rated up to 40 amp-hours so if the 12V battery on your camper is rated for 40 amp-hours or less, you can use it. However, most standard sized 12V batteries are going to be rated for higher than that. This particular charger has a maximum output of just 2 amps so it's going to take a really long time (if ever) to charge up a full size 12V battery if it's anything less than fully charged when hooking it up....
    view full answer...
  • Battery Charger Options For Battery On 35 Ft Trailer To Operate 10,000 Lb Winch
    Since a battery cannot be charged with trailer connector wiring because it is too small, there are a couple of ways to go. I recommend a battery charger like the NOCO Genius Mini # 329-GENM1. This battery charger plugs into a 110 circuit and will use pulse maintenance to maintain the charge when the battery has reached its full charge. Another method would be to install a battery charger like the Redarc In-Vehicle BCDC Battery Charger, part # 331-BCDC1240D. This would require hooking...
    view full answer...
  • How To Charge Vehicle Battery Using Trailer Battery While Hooked Up To Shore Power
    The purpose of a diode is to stop the back flow of electricity. I can honestly say I have never heard of someone wanting to run a charge line from the trailer battery to the vehicle battery but I'm sure it would be possible. That said, when you attach two batteries to one another via a charge line they will try to balance each other. Therefore, if the start battery has more juice than the trailer battery the trailer battery will pull from the start battery and vice versa. The diode however...
    view full answer...
  • Recommended Charger for Breakaway Kit Battery When Storing for Long Periods of Time
    If your trailer won't be getting used very often, it is wise to use a maintainer charger on your trailer battery and breakaway battery to keep them in good working order. I recommend using a battery charger like the NOCO Genius Mini # 329-GENM1 so it will maintain your battery. This will make it so you can simply plug it in when storing it and you can be sure it will work well when you are ready to tow.
    view full answer...
  • No Power To 7-Way Vehicle Connector on 2008 Nissan Pathfinder After Tow Wiring Harness Installation
    On your 2008 Nissan Pathfinder the Towing Relay 2 fuse is the brown relay, like the one included in kit # C57000.This relay will activate the 12-volt power circuit on the 7-Way connector. This relay is located in a fuse box under the hood, next to the vehicles battery. Next to the brown relay will be Towing Relay 1 (blue) which should be installed to activate the running lights and signal for the 4-pin towing harness. To charge a trailer battery from the 7-Way you should be using the...
    view full answer...
  • Correct Wiring Installation for aTrailer Breakaway Kit
    If you are installing a trailer breakaway kit like # C52041, then you can use the 12-volt auxiliary power wire to help provide a maintenance charge on your breakaway kit's battery. A breakaway kit that does not have an onboard charger will have to use 3 wires to operate. One red or black wire (12-volt power) that will come off the 12 volt auxiliary circuit. This wire will keep a maintenance charge on the battery when connected to your vehicle. A white wire that will be the ground and...
    view full answer...
  • Options for Charging Accessory Battery on Trailer and Making Sure Battery Doesnt Overcharge
    If you do not want to disconnect the vehicle connector from the trailer connector when you are not towing, you can install a Tow Ready Battery Isolation Solenoid # TR118665 on your tow vehicle. This solenoid will shut off the 12V feed from your vehicle battery to your trailer's battery when the vehicle's ignition is off. I have attached a review video of this solenoid for you. I recommend checking to see if your solar charger has a regulator to ensure that the panel doesn't overcharge...
    view full answer...
  • Maintenance Charging Trailer Batteries Using An Isolation Solenoid
    Yes. The difference in battery styles doesn't matter for you to use the Tow Ready Battery Isolation Solenoid # TR118665 to give you a maintenance charge on your trailer batteries while connected. When disconnected from your tow vehicle for long periods, I recommend using a battery tender/maintainer like the NOCO Genius Mini # 329-GENM1 versus a trickle charger on those batteries to make sure your trailer is ready for use when you are ready to camp. This unit uses a multi-stage charging...
    view full answer...
  • Trailer Hitch, Brake Controller, And Wiring Recommendation For 2014 GMC Savana Van With No Tow Pkg
    I will start with the trailer hitch for your 2014 Savana. From my research I found the Savana can tow a trailer up to 10,000 lbs. The trailer hitch I recommend is the Draw-Tite Ultra Frame Trailer Hitch Receiver, part # 41946. This is a Class V hitch and has a 2 inch receiver opening. You might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8...
    view full answer...
  • Can a Motorcycle Battery Be Used With a Gas/Electric RV Water Heater
    Yes, you can use a motorcycle battery to power the thermostat and ignitor on an RV water heater such as the Atwood RV Water Heater part # AT96163 for 6 gallon or part # AT94022 for 10 gallon. However, you will need to make sure the motorcycle battery is 12 VDC as some can also be 6 VDC which you could still use but would need to use two and wire them in series. Please note that the unit would still need to have access to 120 VAC as well as natural gas in order to function properly. The...
    view full answer...
  • How To Charge Trailer Battery From a Chevrolet Silverado With a 7-Way Connector
    To keep the trailer battery charged you will need to run a 10 gauge power wire like the, part # 10-1-1, from the 12 volt power pin (# 4 terminal at 11:00 position) on your trailers 7-way connector, to the positive terminal on the trailer battery. Now when the trailer is connected and you are towing, the tow vehicle will provide a maintenance charge to the trailer battery. It will not charge the battery from a discharged state. You will want to test the # 4 terminal at the 1:00 position...
    view full answer...
  • Can a 7-Way Trailer Connector Be Used To Charge the Trailer Battery
    The 12 Volt auxiliary terminal on your 7-way connector can be used to keep the battery on your trailer charged. You will need to run a 10 gauge power wire like # 10-1-1 from the 12 volt auxiliary terminal on the 7-Way trailer connector on the trailer to the positive terminal on the trailer battery and ground the negative terminal of the trailer battery to the trailer frame. This will allow you to maintain a charge on your trailer battery, it will not charge the battery from a discharged...
    view full answer...
  • How To Charge Trailer Battery On Dump Trailer Using The 7-Way Trailer Connector
    You will want to use a circuit tester like part # 40376, and check the # 4 terminal on the back of the 7-way trailer connector on your trailer for power. This is the 12 volt power terminal so there should be power to that terminal. You will need to run a 10 gauge power wire like the, # 10-1-1, from the # 4 terminal (12 volt) on the 7-way trailer connector on the trailer to the positive terminal on the trailer battery. This will allow you to maintain a charge on your trailer battery,...
    view full answer...
  • Recommended Way To Power An Electric Winch For Boat Trailer
    There are a few ways you can wire the winch. The first is to wire it with some quick-disconnects like part # DW05312 to your vehicle battery. Your battery should have at least 440 cranking amps to be able to handle the winch power. Another way is to wire the winch to a separate battery mounted on your trailer. You would need to mount the battery on the trailer in a location where it would not be under water when launching or loading your boat. You can use a battery box. If you choose...
    view full answer...
  • Can a Trailer Mounted Battery be Charged through a Trailer Connector
    You can add a battery to the trailer that is dedicated to the lights in the trailer. However, you will not be able to up-charge the battery through the 7-Way connector, only maintain the current charge level. In order to charge up the battery you would need to use a battery charger like the NOCO Genius Mini # 329-GENM1 This charger works much better than the old trickle chargers that can overcharge a battery and not work to restore it. This charger provides 4 stages of charging that...
    view full answer...

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Info for this part was:

Expert Research:
Jameson C
Expert Research:
Adam R
Installed by:
Randy B
Edited by:
Daron K
Written by:
Brian T

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