NOCO Genius GEN4 40 Amp 4-Bank On-Board Battery Charger


In stock

The GEN4 is an On-Board Battery Charger for charging and maintaining four (4) 12-volt Marine, Starter or Deep-Cycle batteries. It’s waterproof, shock and vibration…

In stock

The GEN4 is an On-Board Battery Charger for charging and maintaining four (4) 12-volt Marine, Starter or Deep-Cycle batteries. It’s waterproof, shock and vibration resistant rugged design can be mounted directly onto a variety of applications, including a boat, trolling motor or generator, as well as, a full range of electric vehicles and industrial equipment. It monitors battery activity for safe, fast and efficient charging of Wet, Gel, AGM and Maintenance Free batteries without the worry of overcharging. And it’s one of the most advanced charging systems designed for improved battery performance and longevity.

  • A 4-bank, 40 Amp (10 Amps per bank) on-board battery charger.
  • Charges starter and deep-cycle batteries up to 230Ah.
  • 100% completely sealed and waterproof design rated at IP68.
  • Spark-proof technology and reverse polarity protection.
  • Provides full-charge output even with low-line voltages.
  • Built-in battery desulfator to recover worn-out batteries.
  • Charges 2X faster than most marine battery chargers.
  • Saltwater-tested to combat corrosion.
  • Ignition Protection and meets USCG-33 CFR 183.410 requirements.

Fully submersible

100% completely sealed waterproof on-board battery charger

Designed to operate in extreme conditions with a waterproof, shock and vibration resistant rugged construction, as well as, saltwater tested to combat corrosion.


Stabilizes the internal battery chemistry for increased battery performance and longevity by optimizing the batteries internal specific gravity.

Maintenance Plus

A powerful battery maintenance charge that actively monitors and manages charge cycles, but also provides a finishing charge every 24-hours, keeping batteries fully charged with zero overcharge.


Dynamically alters the charging process based on organic battery feedback allowing for precision battery charging.


When detected, it applies a high-voltage low-current pulse charge causing battery sulfation to convert back to the active material, regaining lost battery capacity.


Protects against adverse and abnormal conditions, like reverse polarity, sparks, overcharging, over-current, open circuits, short circuits and overheating.


We don’t design something that merely works, but remains safe after a major failure. So we built-in redundant levels of safety protection.

Ignition Protected

Non-igniting and temperature controlled on-board battery charger for safe and worry-free operation. It’s Ignition Protected and meets USCG-33 CFR 183.410 requirements.

5 Year Warranty

Our on-board battery chargers are built to last. That’s why we back it up with an unbeatable warranty and combine it with unparalleled customer service.

Battery Charging Times

Which on-board battery charger is right you?

Recharging your battery fast and efficient is essential. But selecting the proper on-board battery charger for your application is equally important. Our On-Board Battery Chargers charge at either 4-amps per bank (GEN Mini-Series) or 10-amps per bank (GEN Series). Whether you have a boat, trolling motor, or trailer, the GEN Series charges a standard deep-cycle marine battery in less than half the time of the GEN Mini Series.

Efficient, compact design

Compact, yet powerful on-board battery charger

A mix of electrical engineering and industrial design create a powerful, yet space-efficient charger that can easy to mount anywhere in your boat or equipment. It uses high-frequency switch-mode technology to efficiency convert A/C power into safe D/C power for battery charging. And its on-board microcomputer precisely controls the charging to minimize power loss to create an incredibly compact form factor

The perfect companion

Remote power access anywhere

The GCP1 is an AC Port Plug with an integrated extension cord (16-inches) that offers optimal flexibility and ease of installation. It can mount to the exterior of any boat, vehicle or equipment to make the charging port accessible in a more convenient location. Quickly plug-n-play with any extension cord and requires zero cable modifications or hand wiring. Rated for use at 13-amps, 125-volts, and UL certified. Fits into any standard 2-inch hole size.

What’s In The Box GEN4 4-Bank On-Board Battery Charger With Four (4) Integrated Eyelets
User Guide & Warranty Information
Input Voltage AC 70-130 VAC, 50-60Hz
Battery Banks 4 Banks
Charging Amperage 40 Amps (10 Amps Per Bank)
Charging Voltage 14.4 Volts
Efficiency ~90%
Type of Batteries (4) 12 Volt Lead-Acid Batteries
Battery Chemistries Suitable for Wet Cell (Flooded), Gel Cell, Calcium, AGM, Enhanced Flooded Battery or any Maintenance-Free Battery
Battery Capacity Ideal for Batteries up to 230 Amp-Hours. Suitable for Maintaining All Battery Sizes.
DC Cord Length 6.3 Feet
AC Cord Length 6.0 Feet
Weight 15.6 Pounds
Weight 17 lbs


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