10 Best 3 Bank Onboard Marine Battery Charger of December 2025

• 3 banks, 5 amps per bank
• Multi-stage charging and automatic temperature compensation
• Saltwater tested and fully corrosion-resistant
• Three-year warranty
• Digitally controlled microprocessor design protects your batteries so you can stay on the water longer

Johnson Outdoors

• Microprocessor and software controlled Pulse charging technology delivering a 40% lighter design than the previous generation of epoxy filled chargers, cooler charger operation and faster charging.
• Advanced technology eliminates time consuming troubleshooting by clearly indicating system and Battery connections are OK or if a fault is present on a specific battery bank.
• Fully charge and extend the life of your batteries. Automatically charges, conditions and safely maintains all batteries on board for maximum time on the water.
• After fully charging and conditioning batteries, prosport's energy saver mode will monitor and auto maintain batteries only when needed, maintaining a full state of charge. This significantly reduces AC power consumption, lowers operating costs and maximi
• During short or long-term storage, prosport automatically reconditions all batteries on board once a month for maximum battery life and performance.

ProMariner

• Automatic Temperature Compensation: Chargers sense and adjust to ambient temperature fluctuations to ensure a fast, accurate charge
• Digital Control: Microprocessor-based design delivers a faster, more precise charge every time
• LED Indicator Lights: Inform of charge stage, maintenance mode status, error notifications and full charge
• Automatic Multi-Stage Charging: Controls the voltage and current your battery gets throughout the charging cycle, ensuring a fast, safe and precise charge
• Waterproof Construction: All on-board chargers are built to be waterproof, shock-resistant and vibration-resistant
• 2 banks; 5 amps per bank
• Multi-stage charging and automatic temperature compensation
• Saltwater tested and fully corrosion-resistant
• Three-year warranty
• Digitally controlled microprocessor design protects your batteries so you can stay on the water longer

Boating Accessories

• ProMariner ProSport 20 Plus Gen 3 Heavy Duty Recreational Series On-Board Marine Battery Charger - 20 Amp - 3 Bank

ProMariner

• 2 Year Warranty
• Energy Saver Mode
• Storage Recondition Mode
• Built-in Quality and Safety

ProMariner

• Waterproof, shock and vibration resistant aluminum construction
• Saltwater test, fully corrosion-resistant construction
• Short circuit, reverse polarity, arc and ignition protected
• FCC Compliant and UL listed to marine standard 1236

Minn Kota

• 12V 15 amp 3 bank on-board battery charger
• Built-in safety: reverse polarity, over-current, over-voltage, over-temperature and ignition protection. In-line fuses for maximum DC wire protection.
• 100% Waterproof (IP67) and shock resistant for all fresh and saltwater applications
• Dedicated battery charging, sensing and control per bank
• For all 12 volt flooded and AGM lead acid batteries. 2 year warranty

Guest

• A 12 amp (4 amp per bank) on-board battery charger for charging and maintaining three 12-volt batteries independently.
• Safely charge all types of lead-acid batteries from 20-120Ah, including wet, gel, AGM, and deep-cycle batteries.
• Advanced safety protection featuring spark-proof technology, plus reverse polarity, thermal, ignition, and overcharge protection.
• Rugged and waterproof construction capable of submersion down to 3-meters and rated IP68 and NEMA 6P.
• One of the most advanced battery chargers in its class, which is certified to UL1236, ISO 8846, 33 CFR 183. 410, plus backed by a 5-year .

NOCO

• The 12/24/36V, 20 Amp, 3 battery bank ProSport 20 Plus waterproof battery charger delivers fast efficient charging in a lightweight design. Not compatible for 4D batteries
• Distributed on Demand Technology utilizes 100% of the available charging amps and automatically distributes charge amongst all the batteries as needed . The result is faster, more efficient charging
• Advanced technology eliminates time consuming troubleshooting by clearly indicating system and battery connections are OK or if a fault is present on a specific battery bank
• During short or long-term storage, ProSport automatically reconditions all batteries on board once a month for maximum battery life and performance
• Compact and rugged extruded aluminum design, dual in-line DC safety fuses for trolling motor and house battery banks. Built-in over-voltage, overload, over-temperature, reverse polarity and ignition protection

ProMariner

• The 12/24V, 12 Amp, 2 battery bank ProSport 12 waterproof battery charger delivers fast efficient charging in a lightweight design
• Distributed on Demand Technology utilizes 100% of the available charging amps and automatically distributes charge amongst all the batteries as needed . The result is faster, more efficient charging
• Advanced technology eliminates time consuming troubleshooting by clearly indicating system and battery connections are OK or if a fault is present on a specific battery bank
• During short or long-term storage, ProSport automatically reconditions all batteries on board once a month for maximum battery life and performance
• Compact and rugged aluminum design, dual in-line DC safety fuses for trolling motor and house battery banks. Built-in over-voltage, overload, over-temperature, reverse polarity and ignition protection
• Digital LED Display and Battery Type Selector: LED indicators for Charging, Conditioning and Auto Maintain modes in addition to AC power and selected battery type

ProMariner