Manufacturer | NOCO |
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Place of Business | NOCO, 30339 Diamond Parkway, #102, Glenwillow, OH 44139 USA |
Brand | NOCO |
Model | GEN5X3 |
Product Dimensions | 25.6 x 22.5 x 14.3 cm; 2.76 kg |
Item model number | GEN5X3 |
Exterior | Painted |
Manufacturer part number | GEN5X3 |
Special features | Force Mode For Manual Battery Charging, Onboard Marine Battery Charger For Boats And More, Onboard Battery Maintainer, Trickle Charger And Battery Desulfator, Spark-Proof And Reverse Polarity Protection, Waterproof IP68 Ingress Protection, Temperature Compensation For Accurate Recharging |
Lift Type | 12v |
Amperage | 5 Amps |
Voltage | 12 Volts |
Item Weight | 2.76 kg |
Country of origin | China |
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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
Purchase options and add-ons
Brand | NOCO |
Colour | Black |
Product Dimensions | 25.6D x 14.3W x 22.5H Centimetres |
Item weight | 6.09 Pounds |
Output voltage | 12 Volts |
Specification met | CSA, UL, RoHS |
Input voltage | 120 Volts |
Charging time | 1 Hours |
Current rating | 15 Amps |
Global Trade Identification Number | 00046221190465 |
About this item
- MEET THE GEN5X3 — 37% smaller and 43% more powerful than the GENM3. It’s our most compact and advanced onboard charger yet—engineered 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.r.
- WHAT’S 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.
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Top Brand: NOCO
From the brand

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Established in 1914, NOCO designs and creates premium consumer battery chargers, jump starters, lithium batteries, and a wide range of accessories. Through these world-class offerings, we have effectively set a new standard in design, performance, and safety. We aim to make exceptional products that provide consumers with the ultimate experience. We challenge conventionality and remain vigilant to the highest quality standards. We are NOCO.
From the manufacturer

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Customer Reviews
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4.5 out of 5 stars 3,079
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4.6 out of 5 stars 2,171
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4.6 out of 5 stars 5,773
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4.7 out of 5 stars 1,454
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4.6 out of 5 stars 1,428
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4.6 out of 5 stars 1,383
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4.6 out of 5 stars 960
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Charging Current
| 15 Amps | 5 Amps | 10 Amps | 10 Amps | 20 Amps | 30 Amps | 40 Amps |
Number of Banks
| 3 | 1 | 2 | 1 | 2 | 3 | 4 |
Battery Capacity
| 120Ah x 3 Banks | 120Ah | 120Ah x 2 Banks | 230Ah | 230Ah x 2 Banks | 230Ah x 3 Banks | 230Ah x 4 Banks |
Output Power
| 220W | 72W | 145W | 150W | 300W | 450W | 600W |
Waterproof
| ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
Product 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.
Product information
Technical Details
Additional Information
ASIN | B08G3F4RN8 |
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Customer Reviews |
4.5 out of 5 stars |
鶹 Rank |
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Date First Available | Aug. 18 2020 |
Feedback
Customer reviews
Customers say
Customers like the battery charger for its easy installation, performance, and quality. They mention the instructions are clear and reasonably thorough, and it takes only a few minutes to connect to the batteries. Customers also appreciate the compact size, weight, battery indicator, and customizability.
AI Generated from the text of customer reviews
Customers find the battery charger easy to install and use. They mention the instructions are clear and reasonably thorough. They say it takes only a few minutes and can be configured for each battery.
"...This unit is literally plug and play, safe and incredibility reliable for keeping the batteries not only charged but conditioned while in storage..." Read more
"Very easy to install and get going. Took only a few minutes...." Read more
"It installed easily in the boat. Smaller than last one. Lighter than last one. Hope it lasts as long" Read more
"Installed on boat. Had to cut and splice an extension into one cord to reach all batteries. I was expecting a connect simular to the 2x4 charger...." Read more
Customers are satisfied with the performance of the battery charger. They mention it works well, works great on a marginal battery, and works great for 36V systems. Some say it's easy to use and delivered on time.
"Works great as I have multiple batteries and reduces the use of individual chargers" Read more
"Works well, no more dead batteries" Read more
"...But I like it and performs well." Read more
"Great charger, simple to set up , clear instructions and works flawlessly" Read more
Customers are satisfied with the charging performance of the battery charger. They mention it's charging the batteries well and is of excellent quality.
"Excellent charger..." Read more
"...So far it’s charging the batteries well and I’ve been happy with it, especially for the price compared to other chargers." Read more
"This is a pretty awesome charger!..." Read more
"Great charger, simple to set up , clear instructions and works flawlessly" Read more
Customers are satisfied with the quality of the battery charger. They mention it's great, durable, and plug-and-play.
"more compact than I expected. High Quality...." Read more
"...This unit is literally plug and play, safe and incredibility reliable for keeping the batteries not only charged but conditioned while in storage..." Read more
"I give it 3 stars because usually NOCO is solid product, but this was doa...." Read more
"...It's compact but very heavy, and well built, it has worked as it is advertised so far, just got it, but we'll see how it goes over the next couple..." Read more
Customers like the compact size of the battery charger. They mention it's small and lightweight.
"It installed easily in the boat. Smaller than last one. Lighter than last one. Hope it lasts as long" Read more
"...brand awhile back and returned it for this, I was so surprised how compact it was, small, but dynamite comes in small packages also...." Read more
"Has been working perfectly all summer. Small compact and light weight" Read more
"Small size, easy to use, works great for 36v system...." Read more
Customers like the weight of the battery charger. They mention it's compact but very heavy.
"It installed easily in the boat. Smaller than last one. Lighter than last one. Hope it lasts as long" Read more
"...It's compact but very heavy, and well built, it has worked as it is advertised so far, just got it, but we'll see how it goes over the next couple..." Read more
"This chager is 1/3 the size of the old original charger. It's heavy, very well sealed, easy to connect to the batteries, can be configured for each..." Read more
"Has been working perfectly all summer. Small compact and light weight" Read more
Customers like the battery indicator of the product. They mention it's easy to understand and clearly indicates the battery level.
"...LED indicators are simple and informative. Each bank gets its own positive and neutral cable..." Read more
"...battery bank a few times and its been quick and easy..cleary indicates battery level and doesnt get to hot...." Read more
"...can be configured for each battery type inddividually, easy to understand led indication, easy to undertand instructions, and looks awesome." Read more
Customers like the customizability of the battery charger. They mention it can be configured for each battery type individually and is a great solution for multiple batteries.
"...well sealed, easy to connect to the batteries, can be configured for each battery type inddividually, easy to understand led indication, easy to..." Read more
"Perfect for a 3 battery installation..." Read more
"Great solution for multiple batteries..." Read more
Reviews with images

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Top reviews from Canada
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- Reviewed in Canada on May 13, 2024Verified PurchaseI waited two seasons of charging before this review. I have multiple battery types and different requirements for charging and storing batteries charged and ready for use. This unit is literally plug and play, safe and incredibility reliable for keeping the batteries not only charged but conditioned while in storage over the winter. Highly recommend.
- Reviewed in Canada on March 22, 2025Verified PurchaseGot mine and one week later Canadian Tire had it much cheaper. But I like it and performs well.
- Reviewed in Canada on August 2, 2022Verified PurchaseVery easy to install and get going. Took only a few minutes.
Only thing I would mention, and this is from my own personal experience in the first few days, is that I have one onboard battery exclusively running my refrigerator. It draws about 4.5-5.5 Amps.
The charger maintains the battery, but I have gotten a fault twice now where the charger thinks the battery is no good because it is not keeping charge (especially when the fridge is drawing more than the charger is putting in). So it faults and shuts down that line for charging and my battery discharges. When I shut the fridge off and reset the charger, it will charge that battery back up to full and no issues.
So I might need to return this unit for the 10x3 unit to ensure adequate charge is available to maintain the battery with the fridge going.
But awesome product and easy to install and use. I would recommend these to everyone.
- Reviewed in Canada on April 30, 2025Verified PurchaseExcellent charger quality. I used it to charge 3 different battery banks on my boat (total 7 - 12volt batteries)
LED indicators are simple and informative. Each bank gets its own positive and neutral cable
Ensure the wattage (5W x 3) works for your application and expected charge time
- Reviewed in Canada on September 6, 2023Verified PurchaseIt installed easily in the boat. Smaller than last one. Lighter than last one. Hope it lasts as long
- Reviewed in Canada on September 21, 2022Verified PurchaseInstalled on boat. Had to cut and splice an extension into one cord to reach all batteries. I was expecting a connect simular to the 2x4 charger. The connectors on this one are hard wired.
- Reviewed in Canada on August 1, 2021Verified PurchaseEasy to install and very clear directions. I have charged the 36v trolling motor battery bank a few times and its been quick and easy..cleary indicates battery level and doesnt get to hot. Definetly would recommend to a friend or buy again.
Time will tell about durability but so far so good.
5.0 out of 5 starsEasy to install and very clear directions. I have charged the 36v trolling motor battery bank a few times and its been quick and easy..cleary indicates battery level and doesnt get to hot. Definetly would recommend to a friend or buy again.Small size, easy to use, works great for 36v system.
Reviewed in Canada on August 1, 2021
Time will tell about durability but so far so good.
Images in this review
- Reviewed in Canada on October 25, 2024Verified PurchaseI can keep all 3 batteries maintained during winter time.
Top reviews from other countries
- Outdoorsman ExtrodinareReviewed in the United States on June 25, 2024
5.0 out of 5 stars great Li charger
Verified PurchaseLast 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.
- Someone who has bought different sets of these thingsReviewed in the United States on July 10, 2024
5.0 out of 5 stars Compact and durable enough to be an on board charger!
Verified PurchasePurpose:
-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**
Someone who has bought different sets of these thingsCompact and durable enough to be an on board charger!
Reviewed in the United States on July 10, 2024
-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**
Images in this review
- DarrellReviewed in the United States on June 6, 2025
5.0 out of 5 stars NOCO Genius GEN5X3: Compact Powerhouse for Marine Battery Management
Verified PurchaseThe 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.