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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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 charging banks

332490CFA

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Description

⚡ Charge smarter, sail farther — the GEN5X3 keeps your power game watertight!

RUGGED READY - Fully sealed IP68 waterproof design with anti-vibration mounting for harsh marine environments.
COMPACT POWERHOUSE - 37% smaller yet 43% more powerful than its predecessor—engineered for peak marine performance.
DEEP BATTERY REVIVAL - Force Mode charges dead batteries down to zero volts—rescue neglected power sources effortlessly.
SMART THERMAL SENSING - Adaptive temperature compensation prevents overcharging or undercharging in any climate.
TRIPLE INDEPENDENT CHARGING - Simultaneously charge and maintain three 12V batteries with 5A per bank—perfect for mixed battery types.

The NOCO Genius GEN5X3 is a compact, 3-bank onboard battery charger delivering 15 amps total (5A per bank) for 12V lead-acid and lithium batteries. Featuring selectable charging modes, integrated thermal sensors, and Force Mode for dead battery recovery, it’s engineered for marine durability with an IP68 waterproof rating and anti-vibration mounting. Backed by a 3-year warranty and designed in the USA, it’s the ultimate smart charger for professionals demanding reliable, precise battery maintenance on the water.

Specifications

ASIN	B08G3F4RN8
Amperage	5
Battery Charge Time	1 Hours
Best Sellers Rank	#7,000 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3 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 out of 5 stars 3,532 Reviews
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
Product Dimensions	10.08"D x 8.86"W x 5.63"H
Specification Met	CEC, FCC, UL
UPC	046221190465
Unit Count	1.0 Count
Warranty Description	3-Year Limited

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332490CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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