Having a dual battery isolator in your 4WD or commercial vehicle can be a lifesaver.

we’ve put together a collection of the best 12V Battery Isolators that are currently available on the market. To help you find the perfect 12V Battery Isolator among a wide variety of options, we constantly update our collection with new and trending models.

10 Best 12V Battery Isolators

Based on dozens of customer reviews and ratings, the followings are the top 10 best-selling 12V Battery Isolators:

# Preview Product Price
1 Stinger SGP32 200 AMP Battery Relay Isolator and Relay Stinger SGP32 200 AMP Battery Relay Isolator and Relay $54.00 View Product
2 KeyLine Chargers 12V 140 Amp Dual Battery Smart Isolator VSR - Voltage Sensitive Relay Designed for ATV, UTV, Boats, RV's, Campers 5th Wheels Off Road Vehicles Rhino Polaris Artic Cat ETC KeyLine Chargers 12V 140 Amp Dual Battery Smart Isolator VSR – Voltage Sensitive Relay Designed for… $84.97 View Product
3 GOGONFLY Master Battery Disconnect Switch, 12v High Current Battery Power Cut Isolator Kill Switch, Battery Cut/Shut-Off Switch for RV Marine Boat ATV Car Auto Truck GOGONFLY Master Battery Disconnect Switch, 12v High Current Battery Power Cut Isolator Kill Switch,… $17.99 View Product
4 250 AMP Dual Battery Smart Isolator Universal 12V/24V Voltage Sensitive Relay Intelligent Dual Battery Isolator for Car, Truck, ATV, Battery Starter Controller Heavy Duty Power Switch Charge Relay 250 AMP Dual Battery Smart Isolator Universal 12V/24V Voltage Sensitive Relay Intelligent Dual… $87.50 View Product
5 MaySpare Dual Battery Isolator Kit 12V 140Amp Voltage Sensitive Relay VSR Double Battery Automatic Charger & Wiring Cable Kit MaySpare Dual Battery Isolator Kit 12V 140Amp Voltage Sensitive Relay VSR Double Battery Automatic… $65.00 View Product
6 Dual Battery Smart Isolator DEWINNER - VSR - Voltage Sensitive Relay, 12V 140 Amp Specially Designed for ATV, UTV, Boats, RVs, Campers 5th Wheels Off Road Vehicles Rhino (12V Isolator) Dual Battery Smart Isolator DEWINNER – VSR – Voltage Sensitive Relay, 12V 140 Amp Specially Designed… $26.95 View Product
7 Polaris RZR 2nd Battery Kit, UTV Stereo Second Battery Kit w/Full Throttle FT410 12V Battery, 410CCA, Mount, Isolator, Wires & Hardware (Not for XP Pro) Polaris RZR 2nd Battery Kit, UTV Stereo Second Battery Kit w/Full Throttle FT410 12V Battery,… $345.00 View Product
8 Stinger SGP35 500-AMP Relay and Isolator , Black Stinger SGP35 500-AMP Relay and Isolator , Black $81.99 View Product
9 Dual Battery Isolator Kit - HORSMILE 12V 140Amp Voltage Sensitive Relay & Wiring Cable Kit, Complete VSR Double Battery Automatic Charger, Fits Trucks, SUV, ATV, ATV, UTV, Boats & More, Upgraded Dual Battery Isolator Kit – HORSMILE 12V 140Amp Voltage Sensitive Relay & Wiring Cable Kit, Complete… $49.99 View Product
10 Dual Battery Isolator Kit 12 Volt 140 Amp Voltage Sensitive Relay Complete VSR Double Battery Automatic Charger Dual Battery Isolator Kit 12 Volt 140 Amp Voltage Sensitive Relay Complete VSR Double Battery… $63.00 View Product

Top Rated 12V Battery Isolator Reviews

Since we’ve mentioned 10 different models of 12V Battery Isolators on the above list, it may be difficult for you to find the right one for your needs. This is why we listed the key features of each of these 12V Battery Isolators below:

Sale1

Stinger SGP32 200 AMP Battery Relay Isolator and Relay
Stinger SGP32 200 AMP Battery Relay Isolator and Relay

$54.00
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Product Highlights:

  • 200 AMP Battery Isolator and Relay
  • Prevents primary battery discharge
  • Maximum current transfer
  • Extends battery life
  • Universal 12V Applications
Sale2

KeyLine Chargers 12V 140 Amp Dual Battery Smart Isolator VSR - Voltage Sensitive Relay Designed for ATV, UTV, Boats, RV's, Campers 5th Wheels Off Road Vehicles Rhino Polaris Artic Cat ETC
KeyLine Chargers 12V 140 Amp Dual Battery Smart Isolator VSR – Voltage Sensitive Relay Designed for ATV, UTV, Boats, RV’s, Campers 5th Wheels Off Road Vehicles Rhino Polaris Artic Cat ETC

$84.97
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Product Highlights:

  • ZERO VOLTAGE DROP: Forget the traditional diode relays and so-called “solid state” devices that can rob you of almost 2 amps of output power! The Keyline Dual Battery Isolator is the only unit designed with cutting edge programming to deliver optimum performance – with ZERO sacrifice. This compact battery isolator was built ultra-small (2.6″ x 2.6″ x 2″) to fit almost anywhere! A perfect fit under the hood to get close to your dual batteries.
  • VOLTAGE SENSITIVE RELAY: The KeyLine Automatic 140 Amp Dual Battery Isolator is all you need to charge Two Battery Systems. Voltage Sensitive Relay (VSR) 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’s like having two separate power sources for each battery while only having one alternator!
  • RUGGED DURABILITY: Unlike other isolators on the market, the KeyLine Automatic 140 Amp Dual Battery Isolator is IP65 Certified. This International Protection rating means that your KeyLine isolator is safe for use even for your off-road needs in dusty, wet and unexpected extreme weather environments. Great for extreme vibration applications as well.
  • EASY-TO-USE: The 140 Amp Dual Battery Smart Isolator comes with mounting plate and hardware. Does not include installation wires. Easy-to-follow directions for the most novice DIYer. What could be easier? **If you need installation wiring, see Dual Battery Kit or ATV/UTV Kit.
  • BUY WITH CONFIDENCE: Every 140 Amp Dual Battery Isolator is backed by an industry leading 12-month warranty. If you are not 100% satisfied with your purchase, simply take advantage of the No Questions Asked, 30-Day Money Back Guarantee!!
3

GOGONFLY Master Battery Disconnect Switch, 12v High Current Battery Power Cut Isolator Kill Switch, Battery Cut/Shut-Off Switch for RV Marine Boat ATV Car Auto Truck
GOGONFLY Master Battery Disconnect Switch, 12v High Current Battery Power Cut Isolator Kill Switch, Battery Cut/Shut-Off Switch for RV Marine Boat ATV Car Auto Truck

$17.99
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Product Highlights:

  • HIGH CURRENT: Battery quick disconnect switch produce high current continuous amp rating of 20 amps at 12 volts, Momentary rating of 125 amps at 12V and 250 amps at 6V.
  • NO MORE BATTERY DRAIN: Battery Disconnect Switch provides power cut off to electrical system in an emergency, to help prevent battery drain, safety and efficient. When car or RV or boat is not in use, disconnects the battery safely.
  • SAFETY PROTECTION: Quick cut-off electrical power, help protect against electrical fires and theft when equipment is not in use; provide a reliable way to shutdown electrical power during maintenance and protect batteries from excessive drain.
  • EASY OPERATION: Knob detachable and with spring, this car battery disconnect switch can be controlled by switching to a 45° counterclockwise position. Protect the power supply and prevent leakage.
  • WIDELY APPLICATION: Safety battery disconnects switch universal applied for street roads, rvs, trailers, or any vehicle where a battery cut off switch is required. Meet or exceed original part performance.
4

250 AMP Dual Battery Smart Isolator Universal 12V/24V Voltage Sensitive Relay Intelligent Dual Battery Isolator for Car, Truck, ATV, Battery Starter Controller Heavy Duty Power Switch Charge Relay
250 AMP Dual Battery Smart Isolator Universal 12V/24V Voltage Sensitive Relay Intelligent Dual Battery Isolator for Car, Truck, ATV, Battery Starter Controller Heavy Duty Power Switch Charge Relay

$87.50
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Product Highlights:

  • Voltage: High current 250 Amp/ Continue Current: 250A normally open/ Universal application 12V/24V, LCD display voltage of two batteries
  • Automatically Connection Voltage (Delay 5 seconds) : 13.5V-16V(12V working voltage);27V-32V(24V working voltage)/ Automatically Disconnect Voltage (Delay 5 seconds) : 12.5V,disconnect immediately if it is below 12.5 V
  • Function: 250Amp battery isolator is a primary battery saver, which used to combine two batteries when an alternator is charging (engine running) and isolate them when not charging (engine off) so you can still start your vehicle.
  • Designed with Small Size, Can Fit Anywhere!/ Wide Use on a variety of vehicles–12V/24V Trucks, ATVs, UTVs, Boats, RVs, Vans, Off-road Vehicle, Caravan & Camping Applications.
  • Easy to install, Just power wire in, power wire out. No Need to discharge your vehicle’s original battery by trying your new equipment off-road
5

MaySpare Dual Battery Isolator Kit 12V 140Amp Voltage Sensitive Relay VSR Double Battery Automatic Charger & Wiring Cable Kit
MaySpare Dual Battery Isolator Kit 12V 140Amp Voltage Sensitive Relay VSR Double Battery Automatic Charger & Wiring Cable Kit

$65.00
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Product Highlights:

  • 12V, 140A, 13.3V cut-in voltage, 12.8V cut-out voltage,; Package Include All the Bits and Pieces Needed for a Complete Installation
  • Working Voltage: Having Voltage Sensitive Chip,Rely Cuts in at 13.3 Volts and Cuts out at 12.8 Volts to Ensuring Primary Battery is Always Ready for Vehicle to Run.
  • Fuction: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.
  • Compatibility: This battery isolators are small and suitable for almost anywhere, for ATV, UTV, Boats, RV’s，marine vehicle, truck, caravan
  • LIFETIME WARRANTY :100% High Quality and Enjoy Full Life Warranty, Free Exchange
6

Dual Battery Smart Isolator DEWINNER - VSR - Voltage Sensitive Relay, 12V 140 Amp Specially Designed for ATV, UTV, Boats, RVs, Campers 5th Wheels Off Road Vehicles Rhino (12V Isolator)
Dual Battery Smart Isolator DEWINNER – VSR – Voltage Sensitive Relay, 12V 140 Amp Specially Designed for ATV, UTV, Boats, RVs, Campers 5th Wheels Off Road Vehicles Rhino (12V Isolator)

$26.95
View Product
Product Highlights:

  • Easy to Install: No alternator or ignition connection needed. If you want additional components to complete installation, please click “DEWINNER dual battery isolator kit”.
  • VOLTAGE SENSITIVE RELAY: DEWINNER Automatic 140 Amp Dual Battery Isolator is all you need to charge Two Battery Systems. Voltage Sensitive Relay (VSR) 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’s like having two separate power sources for each battery while only having one alternator! (Only suitable for lead-acid batteries versus lead-acid batteries)
  • FITS A WIDE VARIETY OF VEHICLES -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 4WD, marine, truck, caravan & camping applications
  • WHAT YOU GET: SingleIsolator: 140 Amp Smart Battery Isolator; Easy-to-follow directions for the novice DIYer.
  • BUY WITH CONFIDENCE: Every 140 Amp Dual Battery Isolator is backed by an industry leading 12-month warranty. If you are not 100% satisfied with your purchase, simply take advantage of the No Questions Asked, 30-Day Money Back Guarantee!!
7

Polaris RZR 2nd Battery Kit, UTV Stereo Second Battery Kit w/Full Throttle FT410 12V Battery, 410CCA, Mount, Isolator, Wires & Hardware (Not for XP Pro)
Polaris RZR 2nd Battery Kit, UTV Stereo Second Battery Kit w/Full Throttle FT410 12V Battery, 410CCA, Mount, Isolator, Wires & Hardware (Not for XP Pro)

$345.00
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Product Highlights:

  • Full Throttle FT410 12V Battery, 410CCA, 28AH, Brass SAE Terminal RHP
  • MAXIMIZES BATTERY LIFE Our dual-battery system designed for UTV that allows you to power various electrical components (Light bars and Stereo) without running the risk of discharging the main (starter) battery of your vehicle.
  • MUST HAVE if you are running any type over aftermarket electronics on you UTV. Don’t drain your starter battery.
  • Works on 2 and 4 Seat
  • USA COMPANY: UTV Stereo is an installation shop, retail/online store, and design center for UTV audio. We are dedicated to offering the absolute best options and support for anyone looking to add tunes to their UTV. Our customers are earned by offering the industries best audio solutions. Our kits are built to impress, but yet designed to work in an off-road environment. We will always strive to offer the loudest, cleanest, most reliable stereo kits!
8

Stinger SGP35 500-AMP Relay and Isolator , Black
Stinger SGP35 500-AMP Relay and Isolator , Black

$81.99
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Product Highlights:

  • 500 AMP High Current Relay/Isolator
  • Prevents primary battery discharge
  • Power on demand
  • Extends battery life
  • Universal 12 volt applications
9

Dual Battery Isolator Kit - HORSMILE 12V 140Amp Voltage Sensitive Relay & Wiring Cable Kit, Complete VSR Double Battery Automatic Charger, Fits Trucks, SUV, ATV, ATV, UTV, Boats & More, Upgraded
Dual Battery Isolator Kit – HORSMILE 12V 140Amp Voltage Sensitive Relay & Wiring Cable Kit, Complete VSR Double Battery Automatic Charger, Fits Trucks, SUV, ATV, ATV, UTV, Boats & More, Upgraded

$49.99
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Product Highlights:

  • RUGGED DURABILITY -This dual battery isolator kit is all you need to charge a dual battery system. It features a voltage sensitive chip ensuring your primary battery is always ready for your vehicle to run. This dual battery isolator is also built to withstand extreme weather environments, vibration and is water resistant.
  • EASY TO INSTALL – No alternator or ignition connection needed,You don’t need any additional components to complete installation as everything is included in the kit, including leads, connectors, screws, zip ties, and more.
  • VOLTAGE SENSITIVE RELAY – The Automatic 140 Amp Dual Battery Isolator is all you need to charge Two Battery Systems. Voltage Sensitive Relay (VSR) 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’s like having two separate power sources for each battery while only having one alternator!
  • FITS A WIDE VARIETY OF VEHICLES – This Dual Battery Isolator Kit with Printed Installation Instruction Manual Gives You the Power for Your Recreation Without Needing to Worry About Getting Home After.12V, 140A, 13.3V cut-in voltage, 12.8V Cut-out Voltage, Suitable for 12V 4WD, Marine, Truck, Caravan & Camping Applications.
  • BUY WITH CONFIDENCE – Every 140 Amp Dual Battery Isolator is Backed by an Industry Leading 12-month Warranty. If You are Not 100% Satisfied with Your Purchase, Simply Take Advantage of the “No Questions Asked, 30-Day Money Back” Guarantee.
10

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

$63.00
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Product Highlights:

  • This item can install to most of vehicle,for example Truck, SUV, RV, ATV, UTV, Boat and so on.
  • Function: Cause your accessories to run from a separate battery while the engine is not working on your vehicle, and at the mean time holding your main battery charged and your vehicle always ready to work.
  • This package is including 12 Volt 140 Amp Voltage Sensitive Relay Isolator and includes all other accessrioes.It is including instruction.
  • It can work in dusty, wet and unexpected extreme weather condition.
  • Warranty : We provide 6-month warranty,If you have any questions ,You can contact us and we will reply you within 24 hours

Video Overview

Dual Battery Isolator Install (Step by step)

Step by step Battery Isolator install (12V 140 Amp Dual Battery Isolator by KeyLine Chargers – Voltage Sensitive Relay (VSR) Pro Dual Battery Kit). This isolator …

Final Words

So, these are all of the Best 12V Battery Isolators available on the market. We hope this collection was helpful to find the right 12V Battery Isolator for the money. However, we recommend checking out the features, benefits, and problems of each of these 12V Battery Isolators before taking your decision.