10 Best 12V Battery Isolators

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	$54.17	View Product
2		NVX 500 Amp Mobile Audio Relay Battery Isolator	$64.99	View Product
3		Ampper 12V 140Amp Dual Battery Isolator, Battery Voltage Sensitive Relay (VSR) Smart Battery…	$19.99	View Product
4		KeyLine Chargers 12V 140 Amp Dual Battery Isolator Voltage Sensitive Relay (VSR) Pro Dual Battery…	$114.97	View Product
5		MaySpare 12V 140Amp Voltage Sensitive Relay VSR Double Battery Automatic Charging Relay Dual Smart…	$38.90	View Product
6		MaySpare Dual Battery Isolator Kit 12V 140Amp Voltage Sensitive Relay VSR Double Battery Automatic…	$65.00	View Product
7		Dual Battery Isolator Kit, GOLDPAR 12V 140Amp Sensitive Relay VSR Pro Dual Battery Kit & Wiring…	$65.99	View Product
8		Dual Battery Isolator Kit 12 Volt 140 Amp Voltage Sensitive Relay Complete VSR Double Battery…	$64.50	View Product
9		Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car, Vehicle,…	$14.97	View Product
10		250 AMP Dual Battery Smart Isolator Universal 12V/24V Voltage Sensitive Relay Intelligent Dual…	$87.50	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

$54.17

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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

2

NVX 500 Amp Mobile Audio Relay Battery Isolator

$64.99

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Product Highlights:

• AMP BATTERY ISOLATOR. Great for isolating the second battery to be dedicated to your sound system
• UNCONVENTIONAL ISOLATOR. Doesn’t create a voltage drop to your second battery unlike common isolators do
• POWER HANDLING. Continuous power handling of 500 amps at 12V and surge power handling of 700 amps
• PRIMARY BATTERY SAVER. Lengthens the life of the primary battery when your vehicle engine is off
• ELIMINATES BATTERY DRAIN. It helps eliminate multiple battery drain as it stops battery bank from getting power from each one

Sale3

Ampper 12V 140Amp Dual Battery Isolator, Battery Voltage Sensitive Relay (VSR) Smart Battery Isolator for Car, Vehicle, RV, ATV, UTV and Boat

$19.99

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Product Highlights:

• Purpose: this voltage sensitive relay is design for two battery systems (SUITABLE for Acid-Lead batteries, NOT SUITABLE for Lithium batteries), allow to having two separate power sources while charging by one alternator, it’s all need to charge and isolate two battery systems.
• Primary Battery Protected: cuts in at 13.3 volts and cuts out at 12.8 volts. Ensure your primary battery is always charged and ready to start your engine, the secondary will be charged after the primary battery’s volts exceed 13.3 volts.
• Heavy Duty: this voltage sensitive relay is heavy built to suitable for almost anywhere even off-road, which is water resistant, shock resistant, dust proof and withstand unexpected extreme weather environments.
• Compatible: used for DC 12 V two battery systems isolate and charge, universal used for car, vehicle, RV, ATV, UTV and boat, also two battery electrical equipment.
• Easy to use: this VSR comes with mounting plate and 4 bolts for install. 100% SATISFACTION: no reason for return or change.

Sale4

KeyLine Chargers 12V 140 Amp Dual Battery Isolator Voltage Sensitive Relay (VSR) Pro Dual Battery Kit

$114.97

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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.
• WHAT YOU GET: (1) 140 Amp Voltage Sensitive Relay (VSR); (1) 20 ft red battery cable; (1) 2ft black ground battery cable; (2) positive brass marine type battery terminals; (1) negative brass marine type battery terminal; tinned copper lugs & heat shrink; cable ties; easy-to-follow instructions. Easy-to-follow directions for the most novice DIYer. Power wire in, power wire out. What could be easier?
• 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!!

Sale5

MaySpare 12V 140Amp Voltage Sensitive Relay VSR Double Battery Automatic Charging Relay Dual Smart Battery Isolator

$38.90

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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

Sale6

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

7

Dual Battery Isolator Kit, GOLDPAR 12V 140Amp Sensitive Relay VSR Pro Dual Battery Kit & Wiring Cable Kit, Smart Battery Isolator Kit for Car, Vehicle, RV, ATV, UTV, Boat, Camper, Truck

$65.99

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Product Highlights:

• Robust and durable: It’s like having two separate power sources for each battery and only one alternator! This dual battery isolator can also withstand extreme weather conditions, vibration, and IP65 waterproofing.
• Easy to install: This dual battery isolator kit includes all the parts needed for a complete installation (battery cable, battery terminals, copper lugs, heat shrink tubing, cable ties). You will never get stuck with a dead battery!
• Suitable for a wide range of vehicles. GOLDPAR dual battery isolator kit to provide power for recreation. Suitable for 12V 4WD, boats, trucks, cars, off-roaders, caravans and campers.
• What’s in the box: 1x Smart Battery Isolator, 1x6000mm long 10mm square red cable with terminals on both ends, 1x600mm long 10mm square black ground cable with terminals on both ends, 2x positive marine battery terminals; 1x negative marine battery terminals, 3xSC 16-8 copper crimp lugs, 2x red heat shrink, 1x black heat shrink, 1x insulated blue ring termination, 6x300mm cable ties, 4x self-tapping screws, 2xM6 nuts, 2xM6 spring washers
• While ensuring quality, it offers a 1-year warranty policy. Please buy with confidence.

8

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

$64.50

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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

9

Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car, Vehicle, RV and Boat (On/Off)

$14.97

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Product Highlights:

• Heavy Duty: ABS plastic housing, durable made for safety use, rear cover insulates terminals against any short of circuits, equiped with 4 sets of bolts.
• Operation: On/Off 2 positions, 275 A continuous at DC 12V, 455 A intermittent at DC 12V, 1250 A momentary at DC 12V.
• Compatible: used for DC 12 – 48 V systems to isolate and secure the electrical system, can stand alone or be locked together with other switch.
• Purpose: eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely.
• Copper terminal stud size: 3/8″ (10 mm) x 2, very easy to install, universal used for car, vehicle, Rv and boat, also electrical equipment’s switch.

10

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

Video Overview

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.