The Best Battery Isolator Kit of 2022 – Reviewed and Top Rated

After hours researching and comparing all models on the market, we find out the Best Battery Isolator Kit of 2022. Check our ranking below.

2,604 Reviews Scanned

SaleRank No. #1

VEVOR Split Charge Relay Kit, 6mtr 12V, Automatic Dual Battery Isolator Kit with 140AMP Voltage Sense Relay VSR, Compatible with RV Marine Car Vehicle Truck Caravan Camper Yacht ATV UTV Boats Workshop

Dual Battery Isolator: The smart battery isolator cuts in at 13.3 volts and cuts out at 12.8 volts to ensure your primary battery is always charged and ready to start your vehicle. It can charge two batteries simultaneously and isolate them from each other when the vehicle is turned off.
Easy to Install: This split charge relay kit comes with complete accessories, allowing you to start installing directly without purchasing additional components. Besides, we have detailed instructions for you to complete the installation easily and flawlessly.
Rugged & Durable: Split charge relay is made of a premium plastic material, which is shockproof and dustproof, ensuring maximum strength and durability for long-lasting usage. You will always be prepared and confident to take on any challenge.
Superb IP65 Waterproof: Voltage sensitive relay is waterproof up to IP65, which means that your isolator is secure for use even in dusty, wet, and unexpected extreme weather environments. Great for extreme vibration applications as well.
Fit Various Vehicles: This isolator kit 12v has a compact size of 2.66" x 2.11" x 2.66", suitable for almost anywhere. Mainly used in off-road vehicles, camper vans, RVs, caravans, 4x4s, leisure vehicles, ships, yachts, marine applications, etc.

Rank No. #2

Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup

Advanced Dual Battery Isolator 12V Kit – Designed for superior performance, this dual battery kit ensures efficient power distribution between two batteries without voltage drops. Unlike traditional battery isolator diodes, this automatic disconnect switch eliminates power loss while maintaining a seamless connection between your primary and auxiliary power sources. Compact at 2.6” x 2.6” x 2”, it’s perfect for under-hood installations or as part of a battery relocation kit.
Smart Voltage Sensitive Relay (VSR) for Optimal Charging – Featuring a 12V dual battery wiring kit, this system automatically activates at 13.3V and disengages at 12.8V, ensuring your starting battery remains fully charged. Whether you're installing a marine dual battery kit for your boat, a dual battery kit for truck applications, or need a battery isolator 12V kit for off-grid power, this setup prevents battery drain and guarantees reliable performance.
Built for Extreme Conditions & Rugged Durability – Engineered for off-road adventures, marine use, and daily driving, this dual battery isolator kit is IP65-rated for water, dust, and vibration resistance. Its solid-state design ensures durability, making it an excellent choice for automotive, RV, UTV, and marine battery isolator needs. Whether battling tough trails or navigating open waters, count on this dual battery wiring kit to provide uninterrupted power.
Complete Dual Battery Wiring Kit for Easy DIY Installation – No complicated setup required! This battery isolator kit includes (1) 140 Amp voltage sensitive relay, (1) 20-ft red power cable, (1) 2-ft black ground cable, (2) positive marine-type brass battery terminals, (1) negative brass terminal, tinned copper lugs, heat shrink tubing, cable ties, and step-by-step instructions. Perfect for DIYers of all skill levels—just connect the power wire in, power wire out, and you’re ready to go!
Trusted Performance with Warranty & Money-Back Guarantee – Every dual battery kit by KeyLine Chargers is backed by a 12-month industry-leading warranty. If you’re not 100% satisfied with your purchase, take advantage of our 30-day money-back guarantee—no questions asked! Drive with confidence knowing you have a premium battery isolator 12V kit keeping your power system running at full capacity.

SaleRank No. #3

Nilight 12V 140AMP Dual Battery Isolator Kit with 6 AWG Power Cable Terminal Voltage Sensitive Relay Smart VSR Automatic Charger Disconnect for Truck Van RV ATV UTV Boat Can Am

Function: The Voltage Sensitive Relay (VSR) ensures that the primary battery is always charged and ready to start the vehicle by cutting in at 13.3 volts and cutting out at 12.8 volts. When your engine is turned on and the starting battery is fully charged, the isolation will start charging the second (auxiliary) battery at the same time. Enables you to charge two batteries from one alternator at the same time.
Safe and efficient: The dual battery isolator is made of high-quality material casing and a silicone seal, withstanding extreme weather conditions and vibrations. Its IP66 waterproof rating ensures safe off-road use in dusty, wet, and unpredictable environments, providing you with a reliable and durable solution for your marine or automotive dual battery needs.
Wide Application: Like Having Two Separate Power Sources, The Dual Battery Isolator Kit Enables Your Accessories to Run From a Separate Battery While the engine is not running on your vehicle While keeping your Main Battery Charged and Your Vehicle Always Ready to Go and Start When You Want It. Suitable for 12v camper van trucks, caravans, RV, ATV, UTV, Boat and camping applications.
Versatile: Our VSR Battery Isolator can be used to protect any 12 Volt battery; It eliminates the possibility of running the battery out and keeps it fully charged for when you need it most. Important Note: This item is not compatible with Lithium Batteries
Package Includes: 1x 140amp smart battery isolator; 1x 6AWG Red Battery Cable with Two Connectors; 1X 6AWG Black Battery to Ground Cable with Two Connectors; 1x negative marine battery terminal; 2x positive marine battery terminals; 3x 5/16” battery clamp; 8x screws; 6x nuts; 4x spring washers; 2x red heat shrink; 1x black heat shrink; 2x insulated blue ring terminals; 6×cable ties.

Rank No. #4

UCkasayfy Dual Battery Isolator Kit 12V 140amp, Voltage Sensitive Relay VSR, Smart Battry Isolator Compatible with UTV Marine car RV Boat Truck Trailer ATV Camper Moto, Not Fit for Lithium Batteries

【Function】——Voltage Sensitive Relay(VSR) cuts in at 13.3v and cuts out at 12.8v to ensure your main battery is always charged and ready to run your vehicle. The dual battery isolator can display the voltage, you can check the battery voltage in time
【Secure & Effective】——When the input voltage is lower than 11V or more than 17V, the circuit will be disconnected automatically to protect batteries. IP67 waterproof rating helps smart battery isolator perform well in extreme environments
【Wide Compatibility】——This dual battery kit is suitable for almost anywhere, for ATV, UTV, Boats, RV, marine, vehicle, truck and caravan. 140amp battery isolator is very usefu for storing sports cars and trailers to protect batteries from drained
【Emergency Condition】——The VSR can reverse charge in both manual and automatic modes. For example, when the main battery is out of power, switch to manual mode to connect the circuit, the auxiliary battery can charge the main one in reverse
【After-sales Service】——We have exquisite craft, strict quality control along with excellent after-sales service. That is why our products are worthy of your purchase

SaleRank No. #5

Mata1 Dual Battery Isolator Kit 12V 140Amp IP-67 Waterproof Rating VSR (Voltage Sensitive Relay) Smart Car Charger for All Automotive Land or Marine Vehicles

RELIABLE POWER SOURCE - Get a reliable power source for all on-road travels and off-road expeditions with a smart dual battery isolator; Keep your main battery charged and engine running to ensure your automobile never run out of power in remote areas again
UNIVERSAL COMPATIBILITY - Power up any ground or marine vehicle including ATVs, boats, cars, mini-vans, trucks, RVs, and yachts; Perfect versatile solution for all automotive power needs
ALL-WEATHER RESILIENT - Explore any environment with confidence with the IP-67 waterproof rating dual battery isolator; Designed to perform well and stay resilient in even the toughest weather conditions and terrains
HEAVY-DUTY - Manufactured using premium-grade polyamide 66 and copper PVC; Mata1 endeavours to provide you a robust device that can withstand the test of time and provide you lasting performance
EASY INSTALLATION w/ COMPLETE KIT - Compact design (2.7” x 2.7” x 2”) that fits easily in your automobiles barely taking any space; Enjoy hassle-free installation w/ a complete isolator kit including cables, lugs, terminals, and instructions

Rank No. #6

500 Amp Battery Isolator for Mobile Audio Relay Continuous Battery Isolator Relay Kit 12v 500A

500 AMP BATTERY ISOLATOR - Perfect for any application with multiple batteries that need to be isolated including Marine, Mobile Audio, Off-Road, Power Sports, etc. | battery disconnect relay is used to isolate the second battery which powers audio, visual navigation, or other equipment.
POWERFUL FUNCTION - 12v battery isolator can continuously power handling 500 amps at 12V and handling of 700 amps at surge power | Doesn't create a voltage drop to your second battery unlike common isolators do. battery isolator 500 amp with a maximum current transfer, power on demand.
ELIMINATES BATTERY DRAIN - Normally, when two car batteries are connected in parallel, they are easy to charge and discharge each other | The relay battery isolator stops the battery bank from getting power from each one, eliminating that negative effect | Reducing the natural consumption of batteries after power off, lengthens the life of the primary battery.
FEATURE- Battery isolator solenoid is made of high-quality materials, excellent performance, and durability. Easy to install and start up immediately.

Rank No. #7

RANSOTO Dual Battery Isolator Kit 12 Volt 140 Amp Voltage Sensitive Relay Complete VSR Double Battery Automatic Charger Battery Disconnect Switch Battery Isolator 12v

Dual Battery Isolator Kit can be widely used in a variety of 12-volt power system vehicles. Such as RV, crossovers, trucks, SUVs, camper, boat, yacht, etc.
This package is including: 1x Voltage Sensitive Relay,1x Positive Battery Connection Cable (20 ft),1x Negative Battery Connection Cable (2 ft),2x M4x40mm Screws,3x M4x20mm Screws,1x 25-6 Toroidal Terminal Blocks,1x Negative Marine Battery Terminal,2x Positive Marine Battery Terminal,2x Red Heat Shrink Tubing,1x Black Heat Shrink Tubing,6x Cable Ties,3x Tinned copper lugs ,1x Instructions.
Function: It can isolate the charging of two batteries, enabling vehicle accessories to draw power from the secondary battery when the engine is not running, while ensuring that the main battery is continuously charged at the same time.
Rugged and durable: 12 volt dual battery isolator kit is made of high quality materials and advanced technology, with good high temperature resistance, shock resistance and waterproof performance.
Installation: Easy to install and did't need special tool.

Rank No. #8

Battery Isolator 12V Kit 140Amp Split Charge Relay with 20ft 6AWG Wiring Cable Kit, Automatic Dual Battery Isolator Kit Voltage Sense Relay for Marine, ATV, UTV, RV, Car

STRONG & STURDY: This sensitive relay made of high-quality material housing, adopt the silicone sealed interior to protect the battery isolator, can withstand harsh weather conditions.
VOLTAGE PROTECTION: Our dual battery isolator features a voltage sensitive chip, cuts in at 13.3 volts and cuts out at 12.8 volts, to ensuring your primary battery is always ready for your vehicle to run.
LED INDICATOR: There are LED indicators on the sensitive relay panel. When the dual battery isolator is turned on, the LED indicator lights up, when it is turned off, the relay indicator light is off, which is convenient to observe the charging status.
EASY TO INSTALL: Voltage sensitive relay package contains a complete set of installation accessories, with the help of the installation instructions, you can easily complete the installation, no alternator or ignition connection needed.
WIDE APPLICATION: POWO Carlife smart battery isolator are small enough to fit anywhere and fit perfectly into most cars, RVs, trucks, tankers, SUVs, ships, boats, yachts.

Rank No. #9

250 Amp Dual Battery Isolator Kit, Universal 12V/24V VSR Voltage Sensitive Relay Switch Kit, Heavy Duty Smart Battery Isolator for Marine Car Truck RV ATV

Smart Battery Isolator: The dual battery isolator ensures that the main battery is always charged and ready to start the vehicle. It's like your vehicle has two separate power sources for each battery while only having one alternator
Voltage Display: After connection, the voltage display is 13.5V-16V(12V working voltage); 27V-32V (24V working voltage). The battery isolator will disconnect immediately if it is below 12.5 V. There is a 5 second delay when connecting or disconnecting automatically
Applicable to Lithium Batteries: The dual battery isolator adds a lithium battery connection cable, so it can be applied to vehicles with lithium batteries to maintain the stable performance of the car battery. This product has 4 fixing holes for easy installation
Unrestrained Start Engine: Current: 250 Amps; Voltage: 12/24V (Universal). LCD display: real time monitoring of 2 batteries voltage. After installing this smart battery isolator, there is no need to worry that the engine cannot be started when the battery is dead, just press the emergency button and turn on the auxiliary battery to start quickly
Wide Range of Applications: The battery isolator kit has a small design, does not take up space, and is compatible with a variety of vehicles, such as 12V/24V trucks, ATVs, UTVs, boats, RVs, vans, off-road vehicles, and campers

Rank No. #10

maXpeedingrods 12V 24V Dual Battery Isolator Kit 150AMP with Intelligent Controller for Car, Truck, ATV, RV Batteries Starter Smart Dual Battery Isolator

Independent Control Panel: Without opening the hood, you can control the main battery and auxiliary battery connection status and monitor the battery voltage in the car
Intelligent Management: This dual battery manager automatically cuts off power to protect the main power supply, optimizes the utilization of main and auxiliary battery power, and manages bidirectional charging and discharging
Start Assist Function: When the car cannot start the ignition, the 12V main battery voltage is lower than 10.8V (24V battery is lower than 21.6V), and the 12V auxiliary battery is higher than 10.8V (24V battery is higher than 21.6V), if the relay is disconnected at this time, pressing the Link key means forcibly connecting the relay, connecting the main and auxiliary batteries, and remaining connected for 120 seconds
Durable Material: The dual battery isolator features IP65 certification, ensuring safety in use, and its surface material is waterproof, dustproof, and shockproof. Safe for off-road use in dusty, wet, and unpredictable conditions
150A Dual Battery Isolator: Suitable for daily SUV/Pickup medium modification power needs, such as the car has audio, air conditioning, small refrigerator, lighting, and other modifications. It is recommended to use pure copper wire with a cross-sectional area of at least 10 square

Last update on 2025-07-26 / Affiliate links / Images from Amazon Product Advertising API

How Do You Buy The Best Battery Isolator Kit?

Do you get stressed out thinking about shopping for a great Battery Isolator Kit? Do doubts keep creeping into your mind? We understand, because we’ve already gone through the whole process of researching Battery Isolator Kit, which is why we have assembled a comprehensive list of the greatest Battery Isolator Kit available in the current market. We’ve also come up with a list of questions that you probably have yourself.

We’ve done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Battery Isolator Kit that you consider buying. Your questions might include the following:

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We’re convinced that you likely have far more questions than just these regarding Battery Isolator Kit, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Battery Isolator Kit, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Battery Isolator Kit. Make sure that you are only using trustworthy and credible websites and sources.

We provide an Battery Isolator Kit buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Battery Isolator Kit currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

Brand Value: Every brand of Battery Isolator Kit has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
Features: What bells and whistles matter for an Battery Isolator Kit?
Specifications: How powerful they are can be measured.
Product Value: This simply is how much bang for the buck you get from your Battery Isolator Kit.
Customer Ratings: Number ratings grade Battery Isolator Kit objectively.
Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Battery Isolator Kit.
Product Quality: You don’t always get what you pay for with an Battery Isolator Kit, sometimes less, and sometimes more.
Product Reliability: How sturdy and durable an Battery Isolator Kit is should be an indication of how long it will work out for you.

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The Best Battery Isolator Kit of 2022 – Reviewed and Top Rated

How Do You Buy The Best Battery Isolator Kit?

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