The Best Battery Isolator -Reviews & Comparison

If you're looking for the best battery isolator on the market, you've come to the right place. After researching many different options, we compiled this list of the 10 best battery isolator. We assessed features, build, functionality, usability, and many more aspects to find the best options.

Knowing what to look for, which types to choose, and a host of other factors go into choosing among the best battery isolator. There’s good news, though: This guide will explain it all. If you're still here because you need a suitable option, we have a decent selection that should cater to every taste and budget, so read on to find which of the battery isolator will be the best choice for you.

The reasons why you should trust us

You can trust us because we are not just another review site. We are a team of tech enthusiasts and experts who have spent months researching the best products on the market. We factor this into our overall star rating for each product and our final verdict on whether or not we recommend it.

Our rating metrics include the following:

  • Functionality
  • Build material
  • Durability
  • Compatibility
  • Ease of use
  • Quality
  • Price-to-value ratio
  • Reliability
  • Brand
  • Safety
  • Customer reviews

Best battery isolator: Our 10 Choices

Comparison of 10 Best battery isolator
SaleBestseller No. 1
Stinger SGP32 200 AMP Battery Relay Isolator and Relay
  • Universal 12V Applications
  • Maximum current transfer
  • Extends battery life
  • Prevents primary battery discharge
  • 200 AMP Battery Isolator and Relay
Bestseller No. 2
Stinger SGP35 500-AMP Relay and Isolator , Black
  • Power on demand
  • 500 AMP High Current Relay/Isolator
  • Universal 12 volt applications
  • Prevents primary battery discharge
  • Extends battery life
Bestseller No. 3
KeyLine Chargers 12V 140 Amp Dual Battery Isolator Voltage Sensitive Relay (VSR) Pro Dual Battery 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!!
  • 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?
  • 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.
SaleBestseller No. 4
MaySpare 12V 140Amp Voltage Sensitive Relay VSR Double Battery Automatic Charging Relay Dual Smart Battery Isolator
  • 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.
  • LIFETIME WARRANTY :100% High Quality and Enjoy Full Life Warranty, Free Exchange
  • Compatibility: This battery isolators are small and suitable for almost anywhere, for ATV, UTV, Boats, RV's,marine vehicle, truck, caravan
  • 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.
  • 12V, 140A, 13.3V cut-in voltage, 12.8V cut-out voltage,; Package Include All the Bits and Pieces Needed for a Complete Installation
Bestseller No. 5
Stinger SGP38 80-AMP Battery Isolator and Relay,BLACK
  • 80 AMP Battery Isolator and Relay
  • Maximum current transfer
  • Prevents primary battery discharge.80A constant 150A peak
  • Universal 12V Applications
  • Extends battery life
Bestseller No. 6
12V 140Amp Dual Battery Isolator, Ampper Battery Voltage Sensitive Relay (VSR) Smart Battery Isolator for Car, Vehicle, RV, ATV, UTV and Boat
  • 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.
  • 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.
  • 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.
Bestseller No. 7
NVX XSBI200 Dual Sensing Smart Relay Battery Isolator Microprocessor-Controlled 200 Amp
  • Microprocessor-Controlled 200 Amp, Dual Sensing Smart Relay Battery Isolator
  • Switching Power: 10 - 16 VDC. Draws Less Than 1 Amp When On
  • 200 Amps at 12V Continuous Power Handling. 300 Amps Surge Power Handling
  • Dimensions: 2-3/8"W x 2-3/8"D x 3-3/4"H
  • Great for isolating a second batter making it dedicated to the stereo system. Does not create a voltage drop to the second battery like conventional isolators
Bestseller No. 8
RECOIL 500 Amp Mobile Audio Battery Isolator and High Current Starter Relay
  • Prevents the equipment from discharging the main battery when it is operated while the engine is off
  • Extends battery life.Excellent waterproof performance, high quality in any weather conditions
  • Does not create a voltage drop to the second battery like conventional isolator
  • Eliminates multiple battery drain as it stops battery bank from getting power from each one
  • BRL500 handles 500 Amps continuous and 700 Amps Surge
Bestseller No. 9
DB Electrical Alternator 626-01001 Compatible With/Replacement For 90 Amp Dual Multi 2 Two Battery Isolator Marine, RV, EMS Vehicles, Fire Trucks/Negative Ground, 6-50 DC Volts Northwest Reg. MBG90
  • 100% New aftermarket Battery Isolator built to meet OEM specifications
  • 1-year warranty protects you after your purchase. We're confident that our products will work flawlessly once installed in your vehicle. But in a rare case that it does not, we'll replace it anytime within one year of your order. If you have a problem, we will take every step to assist you, contact us for a replacement.
  • Replaces OEM Numbers: ARROWHEAD: 626-01001, J & N: 626-01001, NORTHWEST REG.: MBG90
Bestseller No. 10
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
  • 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.
  • 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.
  • 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.

Buying battery isolator: Things to Consider

When looking for a new battery isolator, knowing which one will suit you best can be difficult. But if you consider a few things before making your purchase, it's much easier to narrow down your choices and make an informed decision about what's right for you.

There are many things to consider before you buy a battery isolator. You want to make sure that it's going to work for your needs, that it's affordable and that it's something you can use with ease.


Here are some things to keep in mind before buying a new product:

  1. What is the purpose? This may seem like an obvious question, but people often forget about it as they get caught up in the excitement of a new battery isolator. If you're looking for an item that will best suit your needs, then don't buy a product that does nothing but entertain you.
  2. What are other people saying about it? It's always best to check out reviews online before making any purchases so that you know what other people think about battery isolator and whether or not they would recommend them. This can help give you an idea if something is worth buying or not before you spend money on a product that won't work out for you at all!
  3. Is it something I'm going to use often? If there's any question about whether or not you'll use something often enough for it to be worth buying, then wait until later when you're sure how much time, effort, and money.

The following are some more things in detail you should consider before you buy:


The first thing to look at is the features of the battery isolator. You should check out if it has all the features that you need. It is not worth the money if it doesn't have any needed features. So check out all these features before buying battery isolator.

Features can be divided into two categories: core features and secondary features. Core features are the main characteristics of a product, whereas secondary features are additional or extra characteristics that make a product better than others.


Quality refers to how well-made the battery isolator is and how long it will last before breaking down or malfunctioning. To determine this, check out online reviews by other users who have bought the same item as yours and see whether they're satisfied with their purchase or not. If there are many negative reviews about a battery isolator or brand, then stay away from them because they're probably not worth buying at all!


Before buying it, you should always consider how much money you will spend on your new best battery isolator. In addition to this, you should also consider what features the product has and whether they will be beneficial for both you and your pet or not. Sometimes, many battery isolator may look similar, but they may vary greatly in terms of cost and quality, so choose wisely when buying something new!

The material used to build it

You should also be aware of what materials are used in the production of the battery isolator, as this will help you to determine whether it’s durable or not. The material used to make the battery isolator can tell you a lot about its quality and durability. This is particularly important if you’re planning on using the battery isolator for a long period or if it will be used frequently. If you’re looking for something that lasts, then you need to consider the material it’s made from.


It is also a good idea to check out the brand of the battery isolator before making a purchase. Different brands have different quality standards depending on their manufacturing process and overall quality control measures. Best to choose from, brands with good reputations for quality products and excellent customer service.

Warranty and return policy

When buying battery isolator, ensure you know what kind of warranty or return policy the manufacturer or seller offers. A good warranty will give you peace of mind that if something goes wrong with your purchase, you can get it fixed or replaced without any fuss or hassle. Look for companies with solid customer service who will work with you if there are any problems with your purchase to resolve them as quickly as possible without making things difficult for you. Look for companies that offer a return policy so that if you are unsatisfied with the product, you can send it back and get your money back.


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