10 Best Marine Battery Charger of August 2025

• An 8 amp (4 amp per bank) on-board battery charger for charging and maintaining two 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

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

ProMariner

• 【UPGRADED DEFECTIVE BATTERY DETECT/FAST CHARGING CAR BATTERY BOOSTER】Updated with battery condition diagnose to detect the defective battery before charge. DC Output 13.8V/5A, AC Input 100-240V, 1.5A 60/50Hz; With 5A DC output current, BMK 12V 5A car battery charger is suitable for charging batteries with 15-100Ah. NOTE: To better tender the battery, please make sure the battery capacity is higher than 15Ah, it can also charge over 100Ah batteries, just more charging time.
• 【UPGRADED 72-HOUR SAFETY FEATURES/MULTI SAFETY PROTECTIONS - BATTERY RESCUE & RECOVER】Updated with 72 hours safety feature to commence anytime the charger is onto protect marginal batteries from over charging. Made of high quality ABS, IP65 Waterproof, multi-protects of Short Circuit/ OV/ OC/ Overload/ Polarity Reverse, featured with Constant Pulse Current Maintenance function to avoid overcharge and discharge; Full-loaded and burn-in test prove its high reliable efficiency, stable performance
• 【4-STAGE SMART CHARGING - FULLY AUTOMATIC BOAT BATTERY CHARGER】 12V battery charger operated with 4 stages automatic charging process by MCU controller, 25%/50%/75%/100% to indicate quantity of electricity and monitor the whole charging progress. Stop automatically when the battery is fully charged. LED indicator designed to display different charging status of the 12v smart charger
• 【UPGRADED WITH 10A FUSE ONTO RING CONNECTORS & MULTI-PURPOSES DEEP CYCLE BATTERY CHARGER】Pb/SLA/VRLA/GEL/AGM lead acid battery charger tender, operated with vulcanization function, BMK battery maintainer charger is a great choice for lawn mower, boat, car, motorcycle, electric vehicle, electric tools and emergency battery charging, lightweight(15.87oz) allows you take it to anywhere, used as Trickle Battery Charger as well
• 【QUALIRY ENSURANCE & IN TIME SERVICE】BMK is devoted to provide boat battery trickle charger with higher qulality to meet buyers' needs better and timely after-sale services, eliminate all your worries about getting this trolling motor battery charger. Just get your Automotive Car Battery Charger Maintainer with confidence, and contact us if you have any problems about the item when using

BMK BLUEMICKEY

• 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

• 12V 10 amp 2 bank 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

• Features 15A to charge and 3A to maintain your battery
• Auto voltage detection automatically detects 6 or 12V batteries
• Automatically selects charge rate for charging and maintaining
• Reverse hook-up protection ensures charger will not operate if clamps are reversed
• Charges compatible battery types, including standard, AGM, gel and deep-cycle batteries

Schumacher

• 【Versatility & Efficient】 2A/8A/15A/Auto charging rate, fully automatic high frequency charging for all types of 12V lead acid batteries, including GEL, AGM and STD. Automatically selects charge rate for charging and maintaining (Do not charge a frozen or battery that has gone below 3V).
• 【Complete 7-step Charging Program】Desulphation, Soft Start, Bulk Charge, Absorption, Battery Test, Recondition and Floating, allow for optimization of battery power, without overcharging or damaging.
• 【Multi-Protection】 Microprocessor-controlled, with multi-stage charging for added precision, safety and battery life. Including Over Voltage, Over Heat, Overtime Charging, Short Circuit and Reverse Polarity.
• 【LCD Screen Display】The battery charger equipped with advanced LCD Display. LCD screen displays charging status, charging current, voltage, battery type and error information with easy to understand icons.
• 【Advanced Winter Charging Mode】Specialized design for charging battery in winter weather conditions to sustain a longer life of battery and to ensure perfect charging.

TowerTop

• 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