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NOCO

NOCO Genius GEN5X3: 3-Bank, 15A Onboard Battery Charger - 5A Per Bank, 12V Waterproof Marine Charger with Overcharge Protection & Temperature Compensation – for Lead-Acid & Lithium Batteries

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Availability: 12 left in stock
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Arrives Oct 4 – Oct 5
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Features

  • MEET THE GEN5X3 37% smaller and 43% more powerful than the GENM3. Its our most compact and advanced onboard charger yetengineered for peak performance in the harshest marine environments.
  • MULTIPLE BANKS A three-bank onboard battery charger rated at 15 amps total - 5 amps per bank. Independently charge 12V batteries in marine, boat, starter, and deep-cycle systems.
  • CHARGING MODES Selectable modes for each bank: 12V, 12V AGM, 12V Lithium, and 12V Repair Mode. Independently charge and maintain all types of lead-acid and lithium-ion batteries with precision.
  • ENJOY PRECISION CHARGING An integrated thermal sensor adjusts charging based on ambient temperature, preventing overcharging in heat and undercharging in cold for optimal battery performance.
  • CHARGE DEAD BATTERIES Charge batteries from as low as 1 volt, or use Force Mode to manually begin charging batteries down to zero volts to recover deeply discharged or neglected batteries.
  • REDEFINED MOUNTING A simplified mounting system allows for fast, secure installation in any orientation - even upside down - with an integrated anti-vibration backing to isolate shock and noise.
  • DESIGNED FOR WATER A fully-sealed onboard charger rated IP68 for waterproof protection. Survives brutal life cycle testing, including thousands of hours underwater in the harshest marine conditions.
  • WHATS IN THE BOX GEN5X3 15A 3-bank onboard charger with 72-inch DC cables and 3/8-inch eyelets, 72-inch AC cable (Type-B), and two mounting screws. Backed by a 3-year warranty and engineered in the USA.

Description

The NOCO GEN5X3 is a fully-sealed, waterproof onboard battery charger rated at 15 amps total—5 amps per bank—designed for 12-volt lead-acid and lithium-ion batteries, including flooded, AGM, gel, and LiFePO₄ chemistries. It’s 37% smaller and delivers 43% more power than the previous-generation GENM3, making it our most compact and advanced charger yet. Each bank operates independently, allowing you to precisely charge and maintain three batteries simultaneously, even if they differ in type or condition. Selectable charging modes—12V, AGM, Lithium, and Repair Mode—offer tailored charging for battery health and longevity, while an integrated thermal sensor automatically adjusts charging in hot and cold climates to prevent overcharging or undercharging. For severely discharged batteries, Force Mode lets you manually begin charging from zero volts, a critical advantage for recovering deeply neglected batteries that other chargers can’t detect. Engineered for the harshest marine environments, the GEN5X3 features an IP68 rating and has endured brutal life cycle testing, including thousands of hours underwater. Installation is fast and secure in any orientation—even upside down—thanks to a redesigned mounting system with an integrated anti-vibration backing that isolates shock and noise. The GEN5X3 comes with 72-inch DC cables with 3/8-inch eyelets, a 72-inch Type-B AC cable, two mounting screws, and a user guide. It’s backed by a 3-year warranty, engineered in the USA, and certified to UL1236, ISO 8846, and 33 CFR 183.410 for safety, ignition protection, and marine compliance.

Brand: NOCO


Color: Black


Product Dimensions: 10.08"D x 8.86"W x 5.63"H


Item Weight: 6.09 Pounds


Output Voltage: 12 Volts


Product Dimensions: 10.08 x 8.86 x 5.63 inches


Item Weight: 6.09 pounds


Item model number: GEN5X3


Date First Available: August 17, 2020


Department: Unisex-Adult


Manufacturer: NOCO


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Oct 4 – Oct 5

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Onboard charger
Size: 15A (5A per Bank)
Arrived on time and a very easy installation. Manual easy to use and the charger works even better than expected. A real quality product
Reviewed in the United States on August 6, 2025 by Steven J. Golden
    • NOCO Genius GEN5X3: Compact Powerhouse for Marine Battery Management
Size: 15A (5A per Bank)
The NOCO Genius GEN5X3 is a versatile and powerful marine battery charger designed to maintain and charge multiple batteries simultaneously. This three-bank charger is ideal for boats with multiple battery systems, providing efficient and reliable charging for each bank. With its advanced charging technology, the GEN5X3 ensures that your batteries are charged safely and quickly, optimizing their performance and lifespan. Key Features: • Compact and Efficient: The GEN5X3 is 37% smaller yet delivers 43% more power compared to previous models, making it a space-saving solution without compromising performance. • Versatile Charging Modes: It supports various battery types, including 12V, 12V AGM, 12V Lithium, and a specialized 12V Repair Mode, allowing for optimized charging tailored to each battery’s needs. • Rugged Design: Built to withstand harsh marine environments, the charger boasts an IP68 waterproof rating and is designed to endure extreme conditions. • Advanced Safety Features: The GEN5X3 includes built-in protections against short-circuiting, overheating, overcharging, and reverse polarity, ensuring safe operation. Conclusion: The NOCO Genius GEN5X3 stands out as a compact, efficient, and versatile marine battery charger. Its advanced features and rugged design make it a valuable addition to any boat’s electrical system. ... show more
Reviewed in the United States on June 6, 2025 by Darrell
    • Great product
Size: 15A (5A per Bank)
Great charger and easy to use .
Reviewed in the United States on June 17, 2025 by William Aitken
    • great Li charger
Size: 15A (5A per Bank)
Last year we purchased Li batteries for my trolling motor. Didn't know that you need a Li charger too. I had a portable one but it needed to be switched to charge both batteries. This eliminated all the swapping hooking up and unhook each time I wanted to go fishing. It also charges my starting lead acid battery too all with only one plug. Works great! It also maintains all three batteries automatically and remembers the last setting, so I don't have to get into the boat each time I charge. Great value for the price. Install depends on your boat and how easy or hard it is to run wires. I did have to lengthen the wires to the starting battery as it is in the very back of the boat. The charger also tells you if you switched the wire polarity. I did have to install a switch between the two Li batteries. As this doesn't charge a 24V system but will charge each battery separately. Just need to remember to switch it back to 24V when using the trolling motor and then back to 2x 12V when charging. ... show more
Reviewed in the United States on June 25, 2024 by Outdoorsman Extrodinare
    • Compact and durable enough to be an on board charger!
Size: 15A (5A per Bank)
Review Image by Someone who has bought different sets of these things Someone who has bought different sets of these things
Review Image by Someone who has bought different sets of these things Someone who has bought different sets of these things
Review Image by Someone who has bought different sets of these things Someone who has bought different sets of these things
Purpose: -Using this as an on board charger for my 36v 00' EZGO TXT Gold Cart. Charging: Three 12v Lithium LiFePO4 batteries Location: Mounted to the underside of the drivers seat. Note: Works very well at charging. When I initially used it (on new batteries) it took about 8hrs to get them all way charged. Slight warning that it did get pretty hot the first few hours. Ever since though, hasn't taken as long to charge because I haven't run them down that low yet. I do like that it will stop the charging on each individual battery when they are fully charged. It doesn't charge them all in a a few hours but it is plenty fast and leaps and bounds better than my old one. Impressions: Compact Durable Smart Gets somewhat hot Worth the money **The electrical tape was a choice and not a necessity** ... show more
Reviewed in the United States on July 10, 2024 by Someone who has bought different sets of these things Someone who has bought different sets of these things
    • All in all, good battery charger.
Size: 15A (5A per Bank)
Overall Great product. A couple small issues that might be user error. One being that I get a better charge on the standard 12V setting than I do on the lithium setting, even though I have lithium batteries. Also, I'm only getting about 190 watts max when I have the generator running. However, that may be the limit for a deep cycle charging system. Plenty of cord, everything is plug n play so very easy to use. ... show more
Reviewed in the United States on February 5, 2025 by kristen
    • Great customer service and support. Total disappointment turned around!
Size: 15A (5A per Bank)
Update: I called customer service, they asked a few questions (they are located in Arizona and speak English 🙌🏻) told me to try a few things to troubleshoot the problem. When that didn’t work they said to ship to them and if it couldn’t be fixed they would send me a new one! It took a couple weeks but I got a brand new charger! I was impressed! Started out great but 2 months in and one of the banks quit working! Of course it’s past the return window. Now I have $200 paper weight! The “code” flashing on the charger isn’t even covered in the manual. ... show more
Reviewed in the United States on March 25, 2025 by Beau
    • Broke in 20 minutes Faulty manufacturing
Size: 15A (5A per Bank)
Would not buy it again, NOCO had a good reputation with me and their Gen1 onboard chargers. Well this one broke in 20 minutes of first use! Very disappointed, It sat in a box new in dry storage at 70F for 2 and a half years, Finally got around to hooking it up to 3 12 volt SLA batteries that were already at 13.1 Volts DC all it had to do was float charge them to 13.5 volts and it just shut off and will not turn back on. Now i have to see what their warranty will do and it claims user will pay shipping fees and service repair fees if its past 2 years from date of purchase! sounds like BS the item is clearly new, just opened was not in service for that time and it comes back to a manufacturing defect. Please send a replacement for your faulty product, this is a bad way to run a business if the person never tested the item till recently. Only a manufacturing defect would of caused this. Ive had NOCO charges that ran for 5 years straight without a single issue. Seems like they cheeped out on parts now with these microcontrollers. Very disappointed and would not buy any of the NOCO micro charger units ever again!! They have lost my future purchases based on this experience and terms of the Warranty. A company should back up their faulty products. every industry has a manufacturing defect at some point and few companies are willing to admit what percentage of products fail from poor component selection and installation. Poor quality control standards must exist with NO testing of products prior to shipping to the consumer. cause had it been tested it would have broken in the factory. ... show more
Reviewed in the United States on July 24, 2023 by Ally

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