FORM Fusion 10X4 4-Bank Marine Battery Charger, 40A Total (10A per Bank), 12V Smart Onboard Boat Charger for Lithium (LiFePO4), AGM, and Deep Cycle Batteries - Waterproof with Force Start
Condition: New
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FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Saturday, Jun 6
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Features
- SET IT & FORGET IT MAINTENANCE MODE Enjoy worry-free charging with our automatic maintenance mode. Once your boat batteries are fully charged, this marine battery maintainer seamlessly switches to trickle modekeeping your lithium marine batteries topped off. Ideal for use as a marine battery tender or battery trickle charger for boat setups.
- ADVANCED WEATHERSHIELD WATERPROOF COATING Built to endure tough marine environments. Our onboard marine battery charger features WeatherShield Internal Coating and IP67 waterproofing, making it the perfect boat charger for saltwater, rain, or high-humidity conditions.
- IMPROVED BATTERY SENSING TECHNOLOGY Multi-bank charger optimized to enhance the lifespan & performance of your Lead Acid, AGM, Lithium or LiFeP04 Batteries. This 4 bank marine battery charger adjusts voltage and current automatically for safe, efficient charging. Use as a 12 volt marine lithium battery charger or multi-bank battery tender to extend battery life and avoid overcharging.
- UNMATCHED CUSTOMER SUPPORT FROM A FAMILY-RUN SMALL BUSINESS Backed by a 24-month warranty and USA-based tech support. Whether you're installing a 4 bank battery tender on a fishing boat or using this as an on board charger for boat storage, were here to help. Includes step-by-step videos and guides. Trusted by over 75,000 boaters who rely on our marine battery chargers for safety and peace of mind.
- FORCE START MODE FOR DEAD BATTERIES Recharge low-voltage or sleep-mode lithium marine batteries with a timed low-amp boost. Force Start mode safely revives dead cells and then switches to full charging automatically. Great for seasonal boats and as a trickle charger for boat battery or emergency marine battery trickle charger.
Brand: FORM
Color: Black
Product Dimensions: 9.8"D x 10.9"W x 2.4"H
Output Voltage: 12 Volts (DC)
Specification Met: CEC, DOE, FCC
Output Voltage: 12 Volts (DC)
Input Voltage: 120 Volts (AC)
Current Rating: 10 Amps
Amperage: 40 Amps
Connector Type Used on Cable: Marine Battery Connector
Number of Ports: 4
Item Dimensions D x W x H: 9.8"D x 10.9"W x 2.4"H
Specification Met: CEC, DOE, FCC
Color: Black
Brand: FORM
Mfr Part Number: FX410A01
UPC: 198715382785
Manufacturer: FORM
Model Number: FX410A01
Warranty Description: 2 Year Manufacturer Warranty
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Jun 6
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Learn more about financing & leasing here.
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Top Amazon Reviews
Size: 4-Bank
This charger is great. Sturdy and heavy duty. The force charge mode is a life saver. Looks great too.
Reviewed in the United States on December 16, 2025 by Amazon Customer
Perfect for my Outdoors RV trailer, that has a 1500-watt inverter supplying 110v to the trailer. I have 400watt solar panels on the roof that are charging my old lead acid batteries this year. Next year I plan to wire the solar to my lithium batteries and get rid of lead acid batteries. Then I won’t need to use this form charger much as Alaskan daylight summer is long. Not as hot up here and don’t need to use my AC. Inverter primarily runs coffee pot, microwave, max air fans, computer, TV and lights Started off late summer with two X2Power 12.8V 125Ah Marine Lithium Iron Phosphate Deep Cycle Battery with Bluetooth. This charger split the 30A between them just fine. I bought a third battery and have all three in parallel, form charger gave all three approx. 10A each until they were charged 100% then shut down nicely. Love this charger!!!
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Reviewed in the United States on September 14, 2025 by ALaska_Blue
Great charger at a good price
Reviewed in the United States on April 26, 2026 by Mallen
Size: 4-Bank
On time and what i ordered.
Reviewed in the United States on April 10, 2026 by james travis helms
Size: 4-Bank
Worked one time on my boat. I went to great lengths to insure proper installation. Charger went into sleep mode and had never awakened. Battery chargers should always display battery status and this one does not. Would not recommend it to anyone.
Reviewed in the United States on April 25, 2026 by Stephen Condra
Size: 4-Bank
I installed this FORM Fusion 10X4 charger aboard my boat, and it’s been a solid upgrade. The fact that it charges four batteries individually (10A each, for a total of 40A) is incredibly convenient. It keeps everything charged and healthy without needing bulky external gear. Plus, once each battery hits full, this unit automatically switches to trickle mode, so you don’t have to babysit your batteries. Another thing I really like is how it’s built for salty environments. The weather-resistant design feels trustworthy when I’m out on the water. And “Force Start” mode? A lifesaver when a battery dips too low, so you basically give it a quick boost to get things rolling again. That said, it’s not exactly cheap and it’s definitely a premium marine charger. Also, while I get peace of mind knowing it’s waterproof and smart enough to handle multiple battery types (lithium, AGM, deep cycle), some of this might be overkill for casual use or smaller setups. Bottom Line: If you’re running a bigger rig or marine system and need a reliable, onboard charger that’s smart and weather-ready, this is a great choice, but just expect to invest a bit more for those features.
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Reviewed in the United States on September 9, 2025 by Cassablanca
This thing is built SOLID! (And in the USofA) That goes not only for build quality but also for heat dissipation. The charging is smooth and relatively quiet for putting out 30A. Would, and very likely WILL, definitely buy again but next time I'm hoping to upgrade to at least 48v.
Reviewed in the United States on September 15, 2025 by Diana Rendon
My new to me sail boat has 200AH of Li Fe batteries. The only charging them are two woefully inadequate solar panels. This bullet proof simple charger was perfect. I had some concerns about the voltage, the batteries are very expensive. The very smart articulate engineer at the other end of a service answered all of my questions in perfect standard English. What a great product this is. Fran
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Reviewed in the United States on July 31, 2025 by Captain Fran