The 10 Best Onboard Battery Tender 2023- Reviews And Buying Guide

Features :

• PREMIUM CONNECTIVITY: The durable Battery Tender DC power connector, trolling motor plug is an onboard connector for 12, 24, 36, and 48-volt DC to DC connections—it’s the perfect fit for battery connections to trolling motors, navigational electronics, or any DC accessory
• BUILT TO LAST: Made from high-strength, corrosion-resistant stainless steel, our power connector is built to be long-lasting, vibration and weather resistant
• MORE POWER, LESS WEIGHT: Compact and non-bulky, our small two-pin battery connector is rated at 80 AMPs continuous service, allowing for a more powerful and continual electrical flow when you need it
• INCLUDES: 2 x 3.25 x 3.5-inch L-shaped connector plug (female) rated at 12, 24, 36, and 48-volt with 80 AMPs continuous service, receptacle (male), gasket, 2 cable cover screws, and linear conversion kit; covered by a 5-year warranty and lifetime customer support
• EASY CONFIGURATION: The unique screw and lock connector is simple to install and provides a secure, convenient connection between your vehicle’s battery and a trolling motor or other DC-powered devices

Features :

• 【2-Bank, 10-Amp】10 Amp (5 Amp per bank) on-board battery charger for charging and maintaining two 6V/12V batteries independently.
• 【Widely Batteries】Safely charge and maintain all types of Lead-acid batteries, including wet, gel, AGM, and deep-cycle batteries. Marine battery charger is also a great choice for Cars, Trucks, RV, Boats, Yachts.
• 【Automatic Voltage Detection】Auto select 6V/12V mode without keying button, it automatically determines the correct voltage for your target battery. Two bank charger output 2 x 5A depending on the condition of each battery. Constantly regulated voltage patterns allow the battery to be recharged fully and safely without fear of overcharging.
• 【Monitor Power Levels】Solid state two-color LED light indicates the state of the charge. Continuous charging, unlimited time, automatically enter the power maintenance mode after full, extend the battery life, worry-free battery charger for daily use.
• 【Multiple Security Protection】Multiple security protection, such as over current protection, overcharge protection, overheat protection, reverse connection protection, short circuit protection. Rugged and 100% waterproof, waterproof coefficient reach IP65.

Features :

• 12V 8 amp 2 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

Features :

• HIGH QUALITY: Made from rugged, commercial grade plastic that resists damage to safely and securely allow for a firm connection to be a stellar choice for a replacement power accessory for your boat
• BUILT TO LAST: Flanged for extra support and to consistently lock in place with an attached rubber cap folds down to protect the charger outlet from UV, impact, corrosion, and other external damage
• EASY TO USE: Convenient hook up to onboard chargers so you can install easily through the wall by attaching the shore power (AC) to the receptacle; works best with the Battery Tender AC Power Cord
• AC TO DC: Marine power port allows for a firm connection between onboard electrical accessories (DC) and shore power (AC) to better serve your electrical power needs when cruising the open water
• LOW PROFILE DESIGN: The heavy duty power port plug is designed to be compact and space-efficient; the stealthy black colorway is perfect for freshwater boats due to its increased resistance to fading

Features :

• STAY CHARGED: This ultra tough industrial charger provides a full charge to your machine’s battery before switching to float mode to maintain proper voltage levels without overcharging the battery. Ultra Performance for most batteries
• FULLY SELECTABLE: Compatible with AGM, flooded, gel, or lithium (LiFePO4) batteries and easily switchable between 12 volts at 5 amps or 24 volts at 2.5 amps to provide and maintain an optimal charge. 12V and 24V Selectable Charger & Maintainer
• HEAVY DUTY: Made with cast aluminum casing that is shock, vibration, and weather resistant to withstand harsh environments so you can reliably charge your vehicle no matter how cruel the conditions. Weather Resistant IP67 Rating
• EASY TO USE: The versatile charger and maintainer for heavy duty industrial machinery features a low maintenance design and is equipped with integrated mounting capabilities for easy installation.Integrated Mounting Capabilities
• SAFE AND SECURE: Our battery charger and maintainer is spark-proof during lead connection and automatically detects reverse polarity to ensure a correct, locked-in connection before providing power. Charges & Maintains Industrial, Automotive, and Marine Batteries at Optimal Charge

Features :

• Meet the GENIUS2D – A direct-mount onboard battery charger for an under-the-hood battery charging. It’s the all-in-one universal charging solution – battery charger, battery maintainer, trickle charger, float charger, plus battery desulfator.
• Do more with Genius – Designed for 12-volt sealed lead-acid automotive, marine, RV, and deep-cycle batteries, including flooded, gel, AGM, SLA, VRLA and maintenance-free batteries.
• Direct Mount – Securely mounts nearby the battery with its rugged snap-fit mounting bracket and effortlessly installs into most materials with truss-head self-tapping screws.
• Enjoy precision charging – An integrated digital thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates.
• Charge dead batteries – Charge batteries as low as 1-volt, including flooded, gel, and AGM, as well as automotive, marine, and deep-cycle batteries.
• Beyond maintenance – It’s not just a battery trickle charger, it’s an advanced battery charger maintainer. A fully-automatic, worry-free smart battery charger for everyday use – 24/7 – with zero overcharge.
• Restore your battery – An advanced battery repair mode uses slow pulse reconditioner technology to detect battery sulfation and acid stratification to restore lost battery performance for stronger engine starts and extended battery life.
• Compatible with all types of gas and diesel vehicles – Add a permanent onboard battery charger to any vehicle to make battery maintenance simple and easy. Plus, combine with any of the GCP Series AC Port Plugs for remote charging access.

Features :

• Meet the GEN5X2 – Similar to our GENM2, only better. It’s 37% smaller and delivers 43% more power. It’s one of the best performing onboard marine battery chargers we have ever made.
• Multiple banks – A two-bank onboard battery charger rated a 10-amps – 5-amps per bank – for 12-volt batteries, including marine, boat, starter, and deep-cycle batteries.
• Charging modes – Independently charge and control each battery bank with selectable charging modes – including 12V, 12V AGM, 12V Lithium, and 12V Repair Mode – for all types of lead-acid and lithium-ion batteries.
• Enjoy precision charging – An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates.
• Charge dead batteries – Charges batteries as low as 1-volt. Or use the all-new force mode that allows you to take control and manually begin charging dead batteries down to zero volts.
• Redefined mounting – A simplified mounting system allows for quick and easy installations in any direction – even up-side-down – with an integrated anti-vibration backing to isolate shock, vibration, and noise.
• Designed for water – A fully-sealed and waterproof onboard battery charger with an ingress protection rating of IP68, but has survived brutal life cycle testing, including thousands of hours underwater.
• What’s in the box – GEN5X2 10-amp 2-bank waterproof onboard marine battery chargers (120-240VAC) with a 72-Inch DC cables with 3/8-inch eyelets and a 72-inch Type-B AC cable, (2) self-tapping mounting screws, user guide, and 3-year warranty.

Features :

• Meet the GEN5X1 – Similar to our GENM1, only better. It’s 37% smaller and delivers 43% more power. It’s one of the best performing onboard marine battery chargers we have ever made.
• Multiple banks – A one-bank onboard battery charger rated a 5-amps – 5-amps per bank – for 12-volt batteries, including marine, boat, starter, and deep-cycle batteries.
• Charging modes – Independently charge and control each battery bank with selectable charging modes – including 12V, 12V AGM, 12V Lithium, and 12V Repair Mode – for all types of lead-acid and lithium-ion batteries.
• Enjoy precision charging – An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates.
• Charge dead batteries – Charges batteries as low as 1-volt. Or use the all-new force mode that allows you to take control and manually begin charging dead batteries down to zero volts.
• Redefined mounting – A simplified mounting system allows for quick and easy installations in any direction – even up-side-down – with an integrated anti-vibration backing to isolate shock, vibration, and noise.
• Designed for water – A fully-sealed and waterproof onboard battery charger with an ingress protection rating of IP68, but has survived brutal life cycle testing, including thousands of hours underwater.
• What’s in the box – GEN5X1 5-amp 1-bank waterproof onboard marine battery chargers (120-240VAC) with a 72-Inch DC cables with 3/8-inch eyelets and a 72-inch Type-B AC cable, (2) self-tapping mounting screws, user guide, and 3-year warranty.

Features :

• Meet the GEN5X3 – Similar to our GENM3, only better. It’s 37% smaller and delivers 43% more power. It’s one of the best performing onboard marine battery chargers we have ever made.
• Multiple banks – A three-bank onboard battery charger rated a 15-amps – 5-amps per bank – for 12-volt batteries, including marine, boat, starter, and deep-cycle batteries.
• Charging modes – Independently charge and control each battery bank with selectable charging modes – including 12V, 12V AGM, 12V Lithium, and 12V Repair Mode – for all types of lead-acid and lithium-ion batteries.
• Enjoy precision charging – An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates.
• Charge dead batteries – Charges batteries as low as 1-volt. Or use the all-new force mode that allows you to take control and manually begin charging dead batteries down to zero volts.
• Redefined mounting – A simplified mounting system allows for quick and easy installations in any direction – even up-side-down – with an integrated anti-vibration backing to isolate shock, vibration, and noise.
• Designed for water – A fully-sealed and waterproof onboard battery charger with an ingress protection rating of IP68, but has survived brutal life cycle testing, including thousands of hours underwater.
• What’s in the box – GEN5X3 15-amp 3-bank waterproof onboard marine battery chargers (120-240VAC) with a 72-Inch DC cables with 3/8-inch eyelets and a 72-inch Type-B AC cable, (2) self-tapping mounting screws, user guide, and 3-year warranty.

Features :

• STAY CHARGED: Battery Tender battery chargers and maintainers provide a full charge to your powersport vehicle’s battery before switching to float mode to maintain proper voltage levels for safe, long-term storage
• EXTEND BATTERY LIFE: Compatible with all 12V lead-acid, flooded, AGM, and gel cell batteries. Complete 4-step charging program (Initialization, Bulk Charge, Absorption Mode, Float Mode) allows for optimization of battery power, without overcharging or battery damage
• INCLUDES: 12V, 750mA battery charger and battery maintainer with 12-foot output cord, fused-ring terminal harness for hard-to-reach batteries and alligator clip accessory cables, 5-year warranty, and lifetime customer support
• SIMPLE & SAFE: Low maintenance, easy-to-use, universal battery charger is just 3.3 x 1.3 x 2.4 inches, 1 lb (charger only). Spark-proof circuitry ensures no-spark connections, and automatic reversed hook-up detection verifies correct connection
• MONITOR POWER LEVELS: Two-color charge status LED light indicates the state of the charge and if the battery voltage drops too far under load, adaptive charging will resume full charger output power. Automatic charge cycle functionality switches to float mode after fully charging the battery