The Best Marine Battery Chargers 2026

1. Promariner 43008 Battery Charger Prosport 8 Amp

Professional Mariner was founded over 35 years ago with one premise; to make boating more enjoyable! We pioneered a robust line of fully automatic, on-board marine battery chargers that provided the marine industry with a mainstream method of charging batteries in a short time without the need for storing or carrying portable battery chargers on-board.

ProMar Digital Technology: Microprocessor and software controlled pulse charging technology delivering a 40 percent lighter design than the previous generation of epoxy filled chargers, cooler charger operation and faster charging System OK and Battery Bank Trouble Status Indicators: 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 Digital Multi-Stage Performance Charging: 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 Energy Saver Mode: 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 maximizes reserve power performance. storage Recondition Mode: During short or long-term storage, ProSport automatically reconditions all batteries on board once a month for maximum battery life and performance

2. Battery Tender 2 Bank Multibank Charger - 2.5 AMP (1.25 AMPs Per Bank) - Smart 12V Multi Battery Charger and Maintainer - 021-0165-DL-WH

The Battery Tender 2 Bank Battery Charger is capable of charging two 12 volt batteries at 1.25 AMPs simultaneously. The unit’s constant current charging is controlled by a microprocessor to prevent overcharging damage caused by trickle chargers. This multibank battery charger is compatible with AGM, sealed maintenance free, and flooded batteries. Charge and maintain motorcycle, ATV, PWC, lawnmower, and dirt bike batteries. The unit is capable of maintaining battery charge at the ideal storage voltage for most 12 volt batteries. A 72-hour safety timer shutoff protects your batteries from overcharging, resuming charge when the battery charge level drops. For further safety, the battery charger is spark-proof and is equipped with reverse polarity protection. Includes two alligator clips for battery connection. The Battery Tender 2 Bank Battery Charger weighs less than 3 pounds and is designed to charge and maintain your batteries wherever you go.

2 CHARGING STATIONS: Charge up to two 12 volt batteries at 1.25 AMPs simultaneously; automatically switches from full charge mode to float charge mode for optimal long-term battery health CONNECT AND FORGET: With a low maintenance design, our universal vehicle charger and maintainer is compact, lightweight, and easy to operate even in small storage space for your convenience INCLUDES: One 2 Bank Multibank Charger Unit, two separate alligator combo clips and a 6-foot AC power cord for simple and convenient use - 2 Year general limited warranty EXTEND BATTERY LIFE: Compatible with all 12V lead-acid, flooded, AGM, and gel cell batteries; complete 4-step charging program works the battery with overcharging or discharging SAFETY FEATURES: This battery charger features reverse polarity protection, a 25-hour safety timer shutoff, and is spark proof STAY CHARGED: Provides a full charge to your vehicle’s battery before switching to float mode to maintain proper voltage levels for safe, long-term storage without overcharging

3. Battery Tender 800mA 12V Weather Resistant Battery Charger and Maintainer - Marine and Automotive Smart Fully Automatic for Boats Watercraft - Selectable Lead Acid Lithium - 022-0150-DL-WH

The Battery Tender® 12V, 800mA battery charger and maintainer has all the features of Battery Tender® Junior, in a mountable, rugged, water-resistant package. This 800 milliamp battery charger is shock and vibration resistant - perfect for all types of vehicles that may be exposed to the elements. This charger has additional functionality to switch between traditional lead-acid, flooded or sealed maintenance-free batteries and lithium battery.

STAY CHARGED: This 800mA charger provides a full charge to your watercraft or vehicle battery before automatically going into float mode to maintain proper voltage levels without overcharging. CONNECT AND FORGET: With a low maintenance design, our universal vehicle charger and maintainer is compact, lightweight, and easy to operate even in small storage space for your convenience INCLUDES: 800mA battery charger, ring terminal and alligator clip combo cable, 3 year warranty, and lifetime customer service EXTENDED BATTERY LIFE: Compatible with lithium, lead-acid, flooded, and sealed maintenance free batteries (AGM and gel cell) ideal for use in long term storage to provide and maintain an optimal charge. It is ETL US/CSA, FCC, ICES, BC, IP67 certified. WEATHER RESISTANT AND DURABLE: With all the features of our best-selliing Battery Tender® Junior, in a mountable water resistant package, this charger is perfect for marine or outdoor environments

4. Battery Tender 12 Volt , 5 Amp Battery Charger

Easily recharge and maintain your battery with the fully automatic Battery Tender 5 Amp charger. With a 4-Step Automatic Charging sequence this charger switches to a float / maintenance voltage after the battery has reached 100%. Designed for all lead-acid, flooded or sealed maintenance free batteries including AGM and Gel Cell. Input: 120V AC @ 60 Hz Output: 12 Volts DC @ 5 Amps Spark Proof Short Circuit Protected Reverse Polarity Protected Safety timer: 72 hrs. Listed in California Appliance Efficiency Database Agency Approvals: UL / CSA / BC / FCC Dimensions: 3.99W x 8.26L x 2.34HAC Power Cord Length: 6 ft. - 18AWGDC Output Cord Length 4.5 ft. - 18AWGDC Accessory Length 1.5 ft. Weight: 3.0 lbs. Warranty: 5 Years

STAY CHARGED: The powerful 5 AMP charger provides a full charge to your automotive vehicle’s battery before automatically going into float mode to maintain proper voltage levels without overcharging. CONNECT AND FORGET: With a low maintenance design, our universal vehicle charger and maintainer is compact, lightweight, and easy to operate even in small storage space for your convenience. Features 11 total feet of combined reach including 6 ft. AC cord and 5 ft. DC output charging cord. INCLUDES: 5 amp battery charger, ring terminal and alligator clip combo cable, 5 year manufacturer's warranty, instruction manual, and lifetime customer service MONITOR POWER LEVELS: Two LED lights indicate the charging status and if the battery voltage drops too far under load, ISM adaptive charging will resume full charger output power. SAFE AND SECURE: Spark-proof during lead connection and automatically detects reverse polarity to ensure a correct, locked-in connection before providing power. EXTEND BATTERY LIFE: Compatible with lead-acid, flooded, and sealed maintenance free batteries (AGM and gel cell) ideal for use in long term storage to provide and maintain an optimal charge. Input voltage 120V AC @ 60 Hz

5. Minn Kota New Batt Charger-Mk330d 3 Bank 10A, 27-1823305

Minn Kota MK-330D 3 Bank x 10 Amps MK 330D On-Board Charger. On-board marine battery chargers: Reengineered with a microprocessor-based design, our all-new digital on-boardchargers protect your battery, charge faster, and help you stay on the water longer. Digitally controlled: We set out to build a smarter charger, and the result is the ingenious microprocessor-based design of our new on-boardunits. By monitoring factors like temperature and state of charge, they deliver a faster, more regulated precise charge so you can stay on the water longer, without worrying about your batteries. Protects batteries: Our new on-board chargers feature Multi-Stage Charging and Automatic Temperature Compensation for more precise charges that wont damage your battery. And its automatic shut-off feature extends battery life by shutting down when charging is complete. So your battery and your day on the water will always last longer. Two times faster charging: In high temperatures, our new on-board chargers juice up your batteries up to twice as fast. Thanks to a digital design that monitors everything from temperature to state of charge, our new on-boards get the job done. Enhanced status codes: Comprehensive readings on our new chargers inform you of the charge stage, maintenance mode status, any error notifications and full charge. Waterproof, shock- and vibration-resistant aluminum construction. Saltwater tested and fully corrosion-resistant. Short circuit, reverse polarity, arc and ignition protected. For use with 12V/6 cell batteries that are flooded/wet cell,maintenance free or starved electrolyte (AGM) only. FCC compliant. UL listed to marine standard 1236. Length - 16-1/4". Width - 7-1/2". Height - 4". Weight - 20lbs. Waterproof, shock- and vibration-resistant aluminum construction Saltwater tested and fully corrosion-resistant. For use with 12V6 cell batteries that are floodedwet cell,maintenance free or starved electrolyte (AGM) only. Short circuit, reverse polarity, arc and ignition protected D FCC compliant. Amps - Output 30 Banks Dimensions 7H x 8W x 18L. Weight 13.5lbs. Brand: Minn Kota Model Number: 1135-39769Shipping Details:

Multi-stage charging Automatic Temperature Compensation 3 Charging Banks 10 Amps per bank Not compatible with Lithium Batteries

6. Pro Mariner ProSport 20 Plus 3 Bank Charger

Professional Mariner was founded over 35 years ago with one premise; to make boating more enjoyable! We pioneered a robust line of fully automatic, on-board marine battery chargers that provided the marine industry with a mainstream method of charging batteries in a short time without the need for storing or carrying portable battery chargers on-board. We haven?t looked back since.

ProSport 20 Plus Gen 3 Heavy Duty Recreational Series On-Board Marine Battery Charger - 20 Amp - 3 Bank: Storage Recondition Mode System OK and Battery Bank Trouble Status Digital LED Display Digital Battery Type Selector (HP AGM cap available on ProSport20 Dual only.) Pre-wired for easy installation ProMar Digital Technology 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. System OK & Battery Bank Trouble Status Indicators 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. Digital Multi-Stage Performance Charging 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. Storage Recondition Mode During short or long-term storage, ProSport automatically reconditions all batteries on board once a month for maximum battery life and performance. Distributed-On-Demand™ Technology Automatically charges and maintains your engine crank battery while distributing all remaining charging amps to trolling motor or house battery/batteries. Digital LED Display & Battery Type Selector LED indicators for charging, conditioning and maintain modes in addition to AC power and selected battery type (2 charge profiles to choose from with a 3rd high performance AGM HP profile on the ProSport20 Dual only). Built-in Quality & Safety 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.

7. ProMariner ProSport 12 Gen 3 Heavy Duty On-Board Marine Battery Charger - 12 Amp - 2 Bank [43012]

Distributed-On-Demand Technology. Automatically charge and maintain engine crank batteries) while sensing and distributing 100% of the available charging amps to trolling motor or house bank batteries). Automatic Multi-Stage Charging. Fully charge and extend the life of your batteries with ProSport's multi-stage performance charge profiles. Automatically charges and conditions your batteries with a built-in safe maintenance mode for long or short term storage. Digital Battery Type Selector. 3 Charge Profiles - User selectable performance charge profiles for: Flooded (lead-acid)/STD AGM, GEL & High Performance (HP) AGM. Expanded LED Status Center. High Visibility LED Status Center provides at-a-glance status of: AC Power, Charge Mode, Battery Type, and Ready/Maintenance Mode. Extruded Aluminum Housing. For superior heat transfer and durability. Dynamic Thermal Output Control. Controls charging amps while maintaining the recommended charger temperature. Built-in Quality & Safety. Compact and rugged design, 100% waterproof and shockproof, dual inline DC safety fuses for trolling motor / accessory battery banks, dynamic thermal output control, over voltage, overload, over temperature, reverse polarity, and ignition protection. Pre-Wired for easy installation.

12 Amp charging capacity 12 or 24 Volt output 2 Battery banks Waterproof, pre wired

8. Attwood Battery Charger

Avoid being stranded with this Attwood Battery Charger. It is a dual-rated twelve- and six-volt battery charger that can be used for all of your marine, automotive, RV and sports applications. This boat battery charger is compact and ideal for your bench, garage or shop use. The LED indicators let you know that it is fully charged. Overcharge, short circuit and reverse polarity protection provide years of use. The outdoor battery charger has an ammeter that indicates the charging current. It has a 6' power cord and 48" battery connector leads. This is a convenient piece of equipment to have so you can make sure your batteries stay charged up. You can check your battery's status before heading out.

Attwood Battery Charger: LED indicator, power on Ammeter indicates charging current Boat battery charger has a 6' power cord length 48" battery connector leads

9. Promariner Promar1 Recreational On-Board Marine Battery Charger

PROMARINER PROMAR 1-5/5/3 13 A

PROMARINER PROMAR 1-5/5/3 13 A

10. ProMariner ProNautic 1250P 63150

ProNautic 1250P, MFG# 63150, 12 Volt, 50 Amp, 3 Bank Battery Charger, with distributed output, alphanumeric LEDs, and optional remote. Five year warranty.

ProNautic P Series 1250P, 12 Volt, 50 Amp Battery Charger Up to 12 performance & precision 4-stage charging profiles: Charge, Condition, Maintain and Re-condition Automatic dockside power mode for 12 Volt DC lighting and appliances. Factory set for Flooded Lead Acid batteries. AGM, GEL selectable Auto-ranging 100-250VAC/50-60Hz global AC input with reduced harmonic distortion Temperature Probe: 10ft