My application is a 36v golf cart (3 x 12v) - I'm assuming that I could use this for a battery maintainer (one "channel" for ea 12v battery)?

Yes. Channel 1 to battery 1, channel 2 to battery 2, channel 3 to battery 3.

I have 2 group 31 Deep cycle batteries in series. Is the charge time with this charger longer leaving them connected? what's the difference?

As long as there is nothing hot feeding off the battery should charge just as fast either way. Leaving the charger connected all the time won’t hurt your batteries. It will go into standby on its own once the batteries reach full charge

Can this be used for all types of standard 12V car batteries?

Yes, it works on 12 and 24 volt systems. I love mine and it will also tell you if your battery is bad. You will love it, works great!

Is it supposed to stay lit after unplugged from marina? Mine is off while the boat is out.

No it doesn't stay lit when unplugged from the power supply.

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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

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

Product ID: 249554814

Details

Brand
NOCO
Color
Black
Item Weight
6.09 Pounds
Output Voltage
12 Volts
Product Dimensions
10.08"D x x

⚡15A total output power

💧IP68 waterproof rating

🔋3 independent 5A charging banks

€ 395.87

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚓ Power your voyage with precision and confidence—charge smarter, sail farther!

COMPACT POWERHOUSE - 37% smaller yet 43% more powerful than its predecessor—engineered for peak marine performance.
FORCE MODE REVIVAL - Resurrect deeply discharged batteries down to zero volts—no battery left behind.
SMART THERMAL CONTROL - Integrated temperature sensor optimizes charging to prevent overcharge or undercharge in any climate.
MARINE GRADE DURABILITY - Fully sealed IP68 waterproof design with anti-vibration mounting for shock and noise isolation.
TRIPLE INDEPENDENT CHARGING - Simultaneously charge and maintain three 12V batteries with tailored modes for lead-acid and lithium chemistries.

The NOCO Genius GEN5X3 is a cutting-edge, fully-sealed 15A onboard marine battery charger featuring three independent 5A banks. It supports multiple battery types including lead-acid and lithium, with selectable charging modes and an integrated thermal sensor for climate-adaptive charging. Compact yet powerful, it boasts IP68 waterproofing and a vibration-isolating mount, making it the ultimate charger for harsh marine environments. Backed by a 3-year warranty and engineered in the USA, it’s designed to keep your batteries healthy and ready for every adventure.

Specifications

Amperage	5
Asin	B08G3F4RN8
Battery Charge Time	1 Hours
Best Sellers Rank	#9,416 in Sports & Outdoors (See Top 100 in Sports & Outdoors) #4 in Boat Battery Chargers
Brand	NOCO
Built In Media	(2) Black Truss-Head Screws, GEN5X3 15A 3-Bank Smart Waterproof Onboard Marine Battery Charger and Battery Maintainer (120-240VAC), Onboard Marine Battery Charger User Guide
Color	Black
Compatible Devices	12-volt batteries (marine, boat, starter, deep-cycle, and lithium-ion)
Connector Type Used On Cable	Standard DC and AC power connectors
Current Rating	15 Amps
Customer Reviews	4.5 4.5 out of 5 stars (3,531) 4.5 out of 5 stars
Global Trade Identification Number	00046221190465
Input Voltage	240 Volts
Item Dimensions D X W X H	10.08"D x 8.86"W x 5.63"H
Item Type Name	NOCO Genius GEN5X3, 3-Bank, 15A (5A/Bank) Smart Marine Battery Charger, 12V Waterproof Onboard Boat Charger, Battery Maintainer and Desulfator for AGM, Lithium (LiFePO4) and Deep-Cycle Batteries
Item Weight	6.09 Pounds
Manufacturer	NOCO
Mfr Part Number	GEN5X3
Model Number	GEN5X3
Number Of Ports	3
Output Voltage	12 Volts
Specification Met	CEC, FCC, UL
Unit Count	1.0 Count
Upc	046221190465
Warranty Description	3-Year Limited

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€ 395.87

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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