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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GEN5X3 12V 15A 3-Bank OnBoard Marine Battery Charger & Maintainer

Product ID: 249554814

Details

Brand
NOCO
Color
Black
Item Weight
6.1 pounds
Output Voltage
12 volts
Product Dimensions
10.08"D x x

⚡15A total output power

💧IP68 fully waterproof rating

🔋3 independent charging banks

¥74214

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Sold byAmazon JapanDelivered 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.
DEEP BATTERY REVIVAL - Force Mode jumpstarts dead batteries down to 0V—rescue neglected power sources others can’t touch.
SMART THERMAL SENSING - Adaptive charging adjusts to ambient temperature, preventing overcharge or undercharge in any climate.
TRIPLE BATTERY MASTERY - Simultaneously charge and maintain 3 different 12V batteries with independent 5A banks for ultimate versatility.
MARINE GRADE DURABILITY - IP68 waterproof, shock-isolated mounting, and tested for thousands of hours underwater—built to survive the harshest seas.

The NOCO GEN5X3 is a cutting-edge, fully-sealed 3-bank marine battery charger delivering 15 amps total (5A per bank) for 12V lead-acid and lithium batteries. It’s 37% smaller and 43% more powerful than previous models, featuring selectable charging modes, thermal sensing, and Force Mode for dead battery recovery. Rated IP68 waterproof and engineered for harsh marine environments, it offers versatile, independent charging with easy installation and a 3-year warranty.

Specifications

ASIN	B08G3F4RN8
Amperage	5
Battery Charge Time	1 hours
Best Sellers Rank	#10,108 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #5 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 A
Customer Reviews	4.5 4.5 out of 5 stars (3,556)
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 Highlight	Charges 3 Batteries at Once, IP68 Waterproof, Overcharge Protection, Temperature Compensation, For Lead-Acid & Lithium
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	6.1 pounds
Manufacturer	NOCO
Mfr Part Number	GEN5X3
Model Number	GEN5X3
Number of Items	1
Number of Ports	3
Output Voltage	12 volts
Specification Met	CEC, FCC, UL
UPC	046221190465
Unit Count	1 Count
Warranty Description	3-Year Limited

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¥74214

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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2 days ago

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