9 Best 12v battery isolators for You in 2021

In this article we will take a look at some of the best chosen 12v battery isolators . We would recommend using KeyLine Chargers 12V 140 Amp Dual Battery Isolator Voltage Sensitive Relay (VSR) Pro Dual Battery Kit as it is our top pick for you

Top 9 best 12v battery isolators review:

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

 in stock
Amazon.com
as of October 4, 2021 10:04 pm

Features

  • 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!!

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

 in stock
Amazon.com
as of October 4, 2021 10:04 pm

Features

  • 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.

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)

 in stock
Amazon.com
as of October 4, 2021 10:04 pm

Features

  • 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!!

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

 in stock
Amazon.com
as of October 4, 2021 10:04 pm

Features

  • 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.

Stinger SGP32 200 AMP Battery Relay Isolator and Relay

 in stock
34 new from $54.00
5 used from $43.03
Free shipping
Amazon.com
as of October 4, 2021 10:04 pm

Features

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

12 Volt 140 Amp Dual Battery Isolator - VSR Voltage Sensitive Relay Fit for Truck, SUV, RV, ATV, UTV, Boat - Complete Double Battery Automatic Charger

 in stock
Amazon.com
as of October 4, 2021 10:04 pm

Features

  • The Dual Battery Isolator can install to most of vehicle,for example Truck, SUV, RV, ATV, UTV, Boat and so on.
  • The VSR Double Battery Automatic Charger with Cut-In:13.3V, Cut-Out:12.8V.
  • The 140 Amp Dual Battery Isolator is IP65 Certified, it can work in dusty, wet and unexpected extreme weather condition.
  • 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.
  • Warranty: For any reason, if you are not satisfied with your purchase, please contact us directly. We offer a 1-year warranty, 100% satisfaction guarantee.

Dual Battery Isolator 12V 140Amp Manual and Auto modes Voltage Sensitive Relay VSR Compatible with RV Marine Car Vehicle Truck Caravan Off-road Camper Yacht ATV UTV Boats,Not Fit for lithium batteries

 in stock
Amazon.com
as of October 4, 2021 10:04 pm

Features

  • 【Manual state use function】——The blue indicator light is ON, press the button each time, you can complete the circuit connection and disconnection. The circuit switched on the red indicator, the voltmeter lights up at the same time. The circuit disconnect red indicator light, the voltmeter goes out at the same time
  • 【Automatic state use Function】——When the input voltage exceeds 13.3V, the circuit will be connected automatically. The voltmeter and red (LED) indicator will also be ON. When the input voltage drops to 12.7V, the circuit will be disconnected automatically. The voltmeter and red (LED) indicator will also be OFF
  • 【Voltmeter display】—— If two batteries are connected, then the voltage displayed on the voltmeter is the battery that has higher voltage. Only connect the battery that you would like test the voltage and disconnect the other battery.When the voltmeter is not working, press the button once, the voltmeter will display the value for 2 seconds
  • 【High & low pressure protection】—— When the input voltage reaches lower than 11V or more than 17V, the circuit will be disconnected automatically to protect the main battery from over discharging or protect the secondary battery from high voltage impact
  • 【12-MONTH Warranty】——We have exquisite craft, strict quality control along with excellent after-sales service. That is why our products are worthy of your purchase

MaySpare 200 Amp Mobile Audio Continuous Relay and Battery Isolator High Current Relay 12VDC

 in stock
Amazon.com
as of October 4, 2021 10:04 pm

Features

  • Function: An isolator is used to combine two batteries when a alternator is charging ( engine running) and isolate them when not charging ( engine off) so you can still start your vehicle
  • Voltage: 12VDC/ Dimensions: 2-3/8"W x 2-3/8"D x 3-3/4"H/Power Handling: Continuous power handling of 200 amps/ Surge Power Handling: 300 amps
  • Advantage: Does not create a voltage drop to the second battery like conventional isolators
  • Wrie Diagram : Connect the two small studs one to ground the other to an ignition on source from fuse box , the order on the large/ small studs does not matter
  • 100% New and High Quality; 1 Year Warranty and Free Return and Refund

250 AMP Battery Isolator Universal 12V-24V VSR Voltage Sensitive Relay Intelligent Dual Battery Isolator Kit for Car, Truck, RV, Emergency Battery Starter Switch Heavy Duty Charge Power Relay

 in stock
Amazon.com
as of October 4, 2021 10:04 pm

Features

  • High current 250 Amp Battery Isolator, Universal application 12V/24V, LCD display voltage of two batteries.
  • Function: Dual battery isolator switch 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.
  • Dual battery isolation protection controller, which automatically detects and identifies the system voltage after the isolator is powered on.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.
  • Voltage Sensitive Relay designed with samll size, portable and compatible for a wide variety of vehicles as 12V/24V Jeep, Truck, SUV, RV, Caravan & Camping Applications. Don't need to drain the original battery on your vehicles trying out your new devices when off-roading, the dual battery isolator will be a nice solution to lengthen the life of the primary battery when your vehicle engine is off…
  • With this dual battery isolator kit, no worries of engine cannot be started when original battery out of power, by pressing the emergency button to turn on the sub battery to start the engine. Easy to install, Just power wire in, power wire out.

Top 12v battery isolators brands

One of the things we suggest to most of our readers is to buy the 12v battery isolators from a well-known brand. Good brands provide, good quality products, great customer support, and have service centers in different places around the country. Regarding the 12v battery isolators I have a preference for the products of the brands listed below.

  • KeyLine Chargers
  • Ampper
  • DEWINNER
  • Horsmile
  • Stinger
  • ANODIZING
  • UCkasayfy
  • Important notes when buying 12v battery isolators

    There are some things you should consider when buying a 12v battery isolators. We spent 22 hours researching the most important things you should consider when buying a 12v battery isolators. So should we start with the list of things you should consider?

    1. Budget and price matching

    Make a list of the things you want in your 12v battery isolators and the price you are willing to pay for it. So try to look for a product in that price range and choose the one that appeals to you the most. One tip we would like to give you is: don’t settle for a cheaper product if it doesn’t even have a function you need.

    Most 12v battery isolatorss fall within the price range of $ 114.97 to $ 38.98. Therefore, if budget is not a problem and you want the best product for your needs, we advise you to choose the KeyLine Chargers 12V 140 Amp Dual Battery Isolator Voltage Sensitive Relay (VSR) Pro Dual Battery Kit.

    If you want something medium range, choose 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. If you have a very low budget, you can choose the one that is the Dual Battery Isolator 12V 140Amp Manual and Auto modes Voltage Sensitive Relay VSR Compatible with RV Marine Car Vehicle Truck Caravan Off-road Camper Yacht ATV UTV Boats,Not Fit for lithium batteries

    2. Does it have all the features you need?

    Most importantly, the 12v battery isolators you are purchasing should have all the features you are looking for. In case you don’t even have one, don’t buy! We are saying this because you will not be able to use it for that purpose. If you are a person without budget problems, I would suggest you to choose the best model which is Dual Battery Isolator 12V 140Amp Manual and Auto modes Voltage Sensitive Relay VSR Compatible with RV Marine Car Vehicle Truck Caravan Off-road Camper Yacht ATV UTV Boats,Not Fit for lithium batteries

    3. The brand

    Buying the 12v battery isolators from a reputable brand can actually make sense. Not only will it be better than others in terms of “build quality”, but it will also have some extra features, better customer support. Famous brands have multiple service centers across the country, so if you have any problems you can simply take your 12v battery isolators to one of their service centers.

    4. Warranty Matters!

    When you buy a 12v battery isolators from a well-known brand, you will get a guarantee. Low-cost products also come with warranties, but the claim process could be tougher. That’s why I always suggest you buy the product from a reputed brand and the one that comes under warranty. It will save you from repair costs in the future. On average, around 21% of people end up paying 40% of the product price for the service! You can save on service costs if the product is under warranty!

    5. Check out our website

    On our website we have experts in all categories and no matter what the product is, we have a better review or list about it. The products on our list are based on expert picks, advice and hours of research. That’s why when you buy something that’s listed on our best list, you won’t regret it. However, there is a possibility that we may not have covered the product you might be interested in, but if you come across something like this, please let us know via comments or contact us.

    FAQs

    What is the best 12v battery isolators?

    The best 12v battery isolators is the one that has all the features that meet your needs. I think the best is KeyLine Chargers 12V 140 Amp Dual Battery Isolator Voltage Sensitive Relay (VSR) Pro Dual Battery Kit

    Are there any good deals on 12v battery isolators?

    In the offline market, you won’t find many offers. However, I have chosen the best 12v battery isolators and have added links to Amazon which has deals and deals running on a regular basis.

    What is the cheapest 12v battery isolators?

    Although most of the cheaper 12v battery isolators do not have many features, but if you are looking for the best one at a low cost, my best bet would be on Dual Battery Isolator 12V 140Amp Manual and Auto modes Voltage Sensitive Relay VSR Compatible with RV Marine Car Vehicle Truck Caravan Off-road Camper Yacht ATV UTV Boats,Not Fit for lithium batteries

    Where can I buy the 12v battery isolators?

    There are several places where you can buy it, but in my opinion, when it comes to the online marketplace, I wouldn’t recommend anything other than Amazon. It’s because their service is great!

    Why should you trust our website?

    We have been in the review business for more than 15 years and our motive is to help people buy the top rated products at the best price. We went through 22 to help you find the best 12v battery isolators

    Conclusion

    We hope you liked the 12v battery isolatorss that we have listed in our best list. If it was helpful, bookmark our site and share it with people you know whenever they intend to buy something.
    To conclude this guide,

  • If you are looking for the best 12v battery isolators: you should consider the idea of KeyLine Chargers 12V 140 Amp Dual Battery Isolator Voltage Sensitive Relay (VSR) Pro Dual Battery Kit
  • If you want the one that has similar characteristics to the best, then you should consider Ampper Battery Switch, 12-48 V Battery Power Cut Master Switch Disconnect Isolator for Car, Vehicle, RV and Boat (On/Off)
  • If you want a 12v battery isolators that is “value for money”, choose 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)
  • If you want the cheapest 12v battery isolators, then Dual Battery Isolator 12V 140Amp Manual and Auto modes Voltage Sensitive Relay VSR Compatible with RV Marine Car Vehicle Truck Caravan Off-road Camper Yacht ATV UTV Boats,Not Fit for lithium batteries should be the best for your needs!
  • Updated: October 4, 2021 — 10:04 pm