Genius On-board Waterproof Marine Battery Charger 4-Bank, 12volt, 40A (AC to DC) (GENPRO10X4)

Submersible, on-board smart charger draws power from a wall outlet to charge and maintain up to (4) 12V batteries at 10-amps. Fully-sealed, waterproof construction is ideal for marine applications. Saltwater tested and ignition protected for safety.

• The NOCO GENPRO10X4 is a high-performance 4-bank onboard charger rated at 40 amps total (10 amps per bank) for 12-volt batteries—ideal for marine, boat, starter and deep-cycle battery systems. 
• Compatible with a wide range of chemistries: 12 V lead-acid (wet/flooded, gel, maintenance-free, calcium), AGM, EFB and lithium-ion (LiFePO₄ with BMS) batteries — choose via selectable charging modes: 12 V, 12 V AGM, 12 V Lithium, and 12 V Repair Mode.
• Precision thermal-compensation technology adjusts charging output according to ambient temperature: no under-charging in cold climates, and no over-charging in hot climates (range -4 °F to 104 °F / -20 °C to 40 °C). 
• Fully sealed, rugged construction rated IP68, designed for extreme marine environments and proven in life-cycle testing—including thousands of hours underwater. 
• Installation-friendly: simplified mounting system allows quick deployment in any orientation—even upside-down—with integrated anti-vibration backing to isolate shock, vibration and noise. 
• Advanced battery-recovery features: automatic detection of sulphation/acid stratification plus a dedicated “Repair Mode” restores and maintains older or idle batteries for improved longevity and performance. 
• Suitable for battery banks up to 230 Ah capacity (12 V system) and is capable of charging batteries from as low as 1 volt via the “Force Mode.” 
• Built-in safety and protection: safeguards include short-circuit protection, open-circuit protection, reverse-polarity protection, spark-proof design, over-heat protection, and more. 
• Input voltage: 120 V to 240 V AC, 50/60Hz; output: 12 V DC at 10 A per bank. Dimensions: approx. 11.4″ × 9.1″ × 2.8″ (289 × 230 × 72 mm). Weight: around 16.98 lb (7.71 kg). 

Full package includes the GENPRO10X4 charger, two self-tapping screws for mounting, and the user guide + warranty information.

3-Year limited warranty (with product registration) gives peace of mind. 

Why this charger stands out

For marine applications, reliability and durability are non-negotiable. The GENPRO10X4 delivers a compact footprint (10 % smaller than predecessor) with 33 % more power than the GEN4. 

Its IP68 certified housing and rugged high-performance design make it perfect for boats, yachts, and other environments where moisture, salt, vibration and harsh conditions are the norm. Independent banks mean you can manage starter, house & deep-cycle batteries separately — no compromises. And with smart modes covering lithium and AGM chemistries, this charger is future-proofed as battery technology evolves.

Ideal use-cases

• Boat owners needing a permanent onboard charger for multiple 12 V battery banks (starter, trolling, house batteries)
• Marine, RV and seaside installations where waterproof, vibration-resistant performance is required
• Deep-cycle lithium (LiFePO₄) battery systems with BMS that require intelligent charging profiles
• Users aiming to extend battery life, maintain banks year-round and avoid premature replacement

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.