Genius 12V Onboard Waterproof Marine Battery Charger, 10 Amp, 2-Bank (GEN5X2)

Elevate your marine power system with the NOCO  Genius  GEN5X2 — a fully sealed, high-performance onboard battery charger crafted for the rigours of marine, starter and deep-cycle battery applications.

Built to deliver reliability in the harshest environments, it gives you two independently controlled banks (5 Amps each, 10 Amps total) and supports a wide range of battery chemistries and capacities. 

Key Features & Benefits:

• Dual-bank design: Two 5 A banks allow simultaneous charging or maintenance of two separate 12 V batteries — ideal for dual-battery boats, starter/house setups or boat/trailer combinations. 
• Multi-chemistry compatibility: Works with 12 V lead-acid types (flooded, gel, AGM, EFB, maintenance-free, calcium) and lithium-ion (LiFePO₄) batteries with BMS. 
• Advanced repair & recovery: Automatically detects sulfation or acid stratification and activates a “Repair Mode” to restore lost battery performance and extend life. 
• Thermal compensation: An integrated sensor monitors ambient temperature and adapts charging to avoid under-charging in cold or over-charging in heat — fully operational from –4 °F up to 104 °F. 
• Waterproof, rugged design: Rated IP68 — fully sealed and tested through thousands of hours underwater and in salt-spray exposure. Built to withstand vibration, shock and marine conditions. 
• Space-efficient footprint: Up to 27% smaller in size than its predecessor, while delivering 43% more power — easy to install in tight locations. 
• Continuous maintenance: Once fully charged, the GEN5X2 shifts into maintenance mode — safe to leave connected indefinitely, giving you peace of mind when your vessel sits idle. 
• Full spec credentials: Suitable for battery capacities up to 120 Ah, input voltage 120-240 VAC 50/60 Hz, compact dimensions (~4.84" H × 7" W × 2.2" D), weight around 4.17lb. 

Why this charger stands out:

• Ideal for boat owners, marine enthusiasts or anyone running dual-battery systems, the GEN5X2 delivers a future-proof solution. 
• You no longer have to compromise on flexibility: its two-bank layout means you don’t have to pick one battery over the other. With multi-chemistry support, you can mix batteries (lead-acid + lithium) and still maintain them properly. The rugged waterproof build means it’s safe to mount in engine compartments, bilges or exposed wet areas without worry.

Installation & Setup Tips:

• Mount the unit in a dry, ventilated location with the supplied self-tapping screws (included). The compact size makes this easy even in tight compartments. 
• Connect each DC cable (72" length) to ring-terminals on each battery bank’s positive and negative. Ensure correct polarity to avoid error indicators. 
• Select the correct charging mode per bank (12 V, 12 V AGM, 12 V Lithium, Repair Mode) by pressing the MODE button. The charger remembers the last mode used (auto-memory). 
• For a deeply discharged battery (below 1 V), use Force Mode (hold MODE for ~3 seconds) to initiate charging from 0 V. 
• Leave the charger connected year-round if desired — its maintenance mode ensures safe upkeep of your batteries without overcharging.

Ideal Applications:

• Marine boats with a starter battery + house or trolling bank
• Dual-battery systems in RVs, vans or off-grid vehicles
• Deep-cycle battery banks used in solar, watercraft, or seasonal vessels

Pre-wired vessels where ruggedness and waterproofing matter. If you demand a high-quality, dual-bank 12 V onboard charger that can handle wet environments, multiple battery chemistries, and deliver advanced recovery and maintenance features

The NOCO Genius GEN5X2 is a premium choice. Its reliable charging, waterproof build, and intelligent diagnostics combine to protect your investment and keep your 12 V battery system ready whenever you hit the water — or the road.

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.