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The NOCO Genius GEN5X3 is a 3-bank onboard battery charger and maintainer for boats and marine setups. Each bank delivers 5 amps to a 12V battery up to 120 amp-hours, with selectable modes for flooded, AGM, lithium and repair. It is IP68-rated, can be mounted in any direction, and charges batteries down to 1 volt or 0 volts in Force Mode. At $188.98 at eBay as of November 5, 2026, it sits at the low end of its recent range across 6 stores.
In stockSold by NOCOReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
In stock
In stock
Availability unknownSold by hitexstore (99.6% positive, 180,200 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
Availability unknownSold by ready2call (99.9% positive, 63,500 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
Availability unknown
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Lowest price we've seen: $199.95 on Nov 6 at Pit Stop USA. Tracked across 13 stores since Nov 6.
Owners rate the GEN5X3 well, at 4.5 out of 5 from 46 ratings. They like the sealed build, the per-bank mode selection and the set-and-forget maintenance. Complaints center on the lack of a display and the modest 5A output per bank.
The NOCO GEN5X3 is our most rugged, compact, and powerful 3-bank onboard marine battery charger yet—37% smaller and delivering 43% more power than the previous GENM3. Designed to charge and maintain three 12-volt batteries up to 120 amp-hours each, it supports all types of lead-acid and lithium-ion batteries, including flooded, gel, AGM, and deep-cycle. With 5 amps per bank, it provides precise charging, maintenance, and desulfation for each battery independently. The GEN5X3 features fully selectable charging modes on each bank—12V, 12V AGM, 12V Lithium, and 12V Repair Mode—allowing total control and flexibility across multiple battery types. Integrated thermal sensing technology ensures optimal charging performance by compensating for temperature extremes, avoiding overcharging in hot conditions and undercharging in cold ones. It can charge batteries as low as 1-volt, or activate Force Mode to initiate charging on completely dead batteries down to zero volts. IP68-rated and tested under extreme conditions, the GEN5X3 is built to survive vibration, shock, and water immersion, with a sealed housing and anti-vibration mount design. It installs easily in any direction—including upside down—and meets all major safety certifications: UL1236, ISO 8846, and 33 CFR 183.410. Included in the box is the GEN5X3 15-Amp 3-Bank charger with 72-inch DC cables featuring 3/8-inch (M10) eyelets, a 72-inch Type-B AC cable, six self-tapping mounting screws, a user guide, and a 3-year warranty.
