12V Battery Isolators Guide With Features

12V Battery Isolators Guide With Features

If you’re looking for a comprehensive and unbiased review of the 12V Battery Isolators on the market, you’ve come to the right place! Our experts test and review hundreds of products every year, so you can be sure you’re getting the most up-to-date information available.

Whether you’re looking for the newest 12V Battery Isolators. We’ve got you covered. We’ll tell you everything you need to know about the products we review, so you can make the best decision for your needs.

Best 12V Battery Isolators – Best Seller

Reviews of The 15 Best 12V Battery Isolators

Bestseller No. 1
Dual Battery Isolator 12V 140Amp, Voltage Sensitive Relay VSR,Compatible with RV Marine Car Vehicles Truck Caravan Off-road Camper Yacht,Not Fit for lithium batteries
  • 【Wide Compatibility】——This battery isolators are small and suitable for almost anywhere, for ATV, UTV, Boats, RV's,marine vehicle, truck, caravan
  • 【Working Voltage】——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 run your vehicle
  • 【Function】——With the engine running the VSR will engage when the starting battery reaches 13.3 Volts and the LED light will illuminate. This means that both batteries are now linked and the system is working.Once you turn off your vehicle the system will disengage the two batteries as it reaches 12.8 Volts,leaving your main battery safe to start again
  • 【Important Note】——When connecting accessories to your second battery ensure they are fused within 0.98FT
  • 【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
Bestseller No. 2
250 Amp Dual Battery Isolator Kit 12V-24V Universal Voltage Sensitive Relay VSR Smart Battery Isolator for Marine Car Truck RV Camper Heavy Duty Battery Starter Controller
  • 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
  • Automatically connection voltage : 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 Amp, 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
Bestseller No. 3
12V 140Amp Smart Waterproof Dual Battery Isolator Fits ATV UTV 4WD RZR RV Car Watercraft Marine Boat Truck Caravan Camping(R12140B-T)
  • ✔ 【5 Year Warranty】Every battery isolator is 100% tested and inspected prior to shipment. We stand behind our products and strive to provide the optimal customer experience.
  • ✔ Efficiency Charging: AOPEC battery isolator can distribute the charger or alternator current effectively between two batteries.AOPEC battery isolator connects both batteries during charging and keeps them isolated when discharging.
  • ✔ Primary Battery Priority Charging: Prevents primary battery discharge, lengthens the life of the primary battery when your vehicle engine is off. This significantly reduces the risk of a flat starter battery for example.
  • ✔ IP65 Weatherproof: Outer plastic-housing and a silicone sealed internallayer, protects your isolator from water,dust,dirt,sand damage.
  • ✔ Safety Protection: The protective design of this battery isolator sustains surge protection,over voltage protection and over current protection.
Bestseller No. 4
Dual Battery Isolator Kit - 12 Volt 140 Amp Voltage Sensitive Relay - Complete VSR Double Battery Automatic Charger - Fits Trucks, ATV, SUV, UTV Boats and more - Safe, Water and Vibration Resistant
  • 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 to. This dual battery isolator kit features 12 Volt 140 Amp Voltage Sensitive Relay Isolator and includes all the bits and pieces needed for a complete installation.
  • Fits A Wide Variety of Vehicles - Being the computer age that it is today, a lot of accessories, tools and gadgets that runs on electricity are essential in our everyday living or hobbies. 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.
  • Complete Kit With Printed Installation Manual - This dual battery isolator kit manufactured by AA Ignition is a complete kit which includes the Isolator or Relay, battery Cables, battery terminals, copper lugs, heat shrinks, cable ties and a printed instruction manual.
  • Premium Rugged Construction - 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.
  • Lifetime Warranty - This 12V 140 Amp dual battery isolator kit comes complete with a lifetime warranty. If the part ever fails on your Truck, SUV, RV, ATV, UTV or Boat simply contact us for a replacement. Avoid getting stucked after your recreation by purchasing this dual battery isolator kit from AA Ignition.
Bestseller No. 5
DEWINNER 12V 140Amp Dual Battery Isolator Manual/Auto Modes VSR-Voltage Sensitive Relay, with LED Screen, Voltage Display, Designed for ATV, UTV, Boat, RV, Camper 5 Wheel Off-Road Vehicle
  • 【Easy installation and waterproof】 No need for alternator or ignition connection. After installation, it can still be used normally even if it is affected by vibration, various bad weather and other factors. At the same time, the isolator supports waterproof function, and the waterproof grade is IP67. (Only suitable for lead-acid battery to lead-acid battery or lithium battery to lithium battery)
  • 【Manual Modes】 Press and hold the "Power" button for 3 seconds, the upper blue (LED) indicator light is on, and the manual mode is turned on. In this mode, click the "Power" button to turn on/off the isolator. Click the "power" button, the lower red (LED) indicator light is on, and the isolator is turned on; click the "power" button again, the lower red (LED) indicator light is off, and the isolator closure.
  • 【Automatic Mode】Long press the "Power" button for 3 seconds, the upper blue (LED) indicator light goes out, and the automatic mode is turned on. In automatic mode, the voltage-sensitive relay (VSR) cuts in at 13.3 volts, and the lower red (LED) indicator lights up. The voltage-sensitive relay (VSR) is cut off at 12.8 volts, and the lower red (LED) indicator light turns off
  • 【LED SCREEN REAL-TIME VOLTAGE DISPLAY】 The surface of the isolator is equipped with an LED display to display the current-voltage status in real-time, allowing you to control the battery status at any time.
  • 【FITS A WIDE VARIETY OF VEHICLES】 Just like having two independent power sources, the dual battery isolator kit enables your accessories to run on a separate battery when the engine is not running on the vehicle while keeping the main battery charged and your vehicle always Get ready and start when you need it. Suitable for 12V 4WD, ships, trucks, caravans, and camping applications.
Bestseller No. 6
POWO Carlife 12V 140Amp Dual Battery Isolator VSR Sensitive Relay & Wiring Cable Kit Double Battery Automatic Charger for RV Marine 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.
Bestseller No. 7
Wztepeng Mobile Audio 500A 12V Relay Battery Isolator 500Amp 12Volt Relay
  • Battery Isolator:Battery isolators are suitable for applications that need to isolate multiple batteries, such as mobile audio, marine, powered sports, etc. It is used to isolate batteries that power AV, navigation, etc. It allows the second battery to be fully dedicated to the sound system and does not create a voltage drop like common isolators tend to do. The isolator will draw less than 1 amp when your vehicle is powered on.
  • Extends battery life:its a must for daily driver systems,This 500 amp continuous duty relay does not have the voltage drop that a solid state battery isolator has and does a much better job of charging auxiliary batteries through.
  • Feature:Made of high-quality materials, excellent performance and durable.Easy to install and start up immediately.
  • Package Include:1 * 500 Amp 12V Mobile Audio Relay Battery Isolator
  • Warranty: For any reason, if you are not satisfied with your purchase, please contact us directly. We offer Half a year warranty, 100% satisfaction guarantee.
SaleBestseller No. 8
Battery Switch, 12V 24V 48V Battery Disconnect Master Cutoff Switch for Marine Boat RV ATV UTV Vehicles, Waterproof Heavy Duty Battery Isolator Switch (On/Off)
  • 【EASY OPERATION】Rating: 275A DC Continuous (1hr), 455A DC Intermittent (5 min), 1250A DC Cranking (10 sec); Stud Size: 2x3/8" (10mm); Switch on = Power; Switch off = No power. Recommend to install on the negative side of the battery (lower current in negative, will be more safety)
  • 【DURABLE MATERIAL】This battery master switch is made of durable plastic housing, tinned copper studs and nuts. Come with 4 stainless steel mounting screws and caps to help fix the switch tightly. Removable rear cover insulates the rear terminals against any short circuits. 4 Removable side plates provided access for battery cables
  • 【COMPATIBLE】This battery disconnect switch is used for DC 12 - 48V systems to isolate and secure the electrical system, can stand alone or be locked together with other switch, simple and economical way to separate batteries
  • 【NO MORE BATTERY DRAIN】This battery isolator switch provides a reliable way to shut down electrical power during maintenance and protect batteries from excessive drain when vehicle or boat is not in use
  • 【WIDE APPLICATION】This battery kill switch is widely used for Car, Marine, Boat, RV, Camper, Travel Trailer, Truck, ATV, UTV, Battery banks and other electrical equipment's switch, such as flashing light, chassis light, fog light, dome light
Bestseller No. 9
Newdeli 12V 140Amp Voltage Sensitive Relay VSR Double Battery Automatic Charging Relay Dual Smart Battery Isolator
  • VOLTAGE SENSITIVE RELAY : The Newdeli 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!
  • ZERO VOLTAGE DROP : This Dual Battery Isolator is the only unit designed with cutting edge programming to deliver optimum performance.When the voltage of the start battery drops the isolator kit disengages from charging the auxillary battery.This isolates the start battery and eliminates the possibility of draining it, ensuring that you always have enough charge to start your engine.
  • RUGGED DURABILITY: Unlike other isolators on the market, the Newdeli Automatic 140 Amp Dual Battery Isolator is IP65 Certified. This International Protection rating means that your Newdeli 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-AND-INSTALL: The 140 Amp Dual Battery Smart Isolator comes with mounting plate and hardware.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.
  • COMPATIBILITY:This battery isolators designed for:ATVS, UTVS, Boats, RVS,CAT, campers, 5th wheels, offroad vehicles, rhino, polaris, artic, marine vehicle, truck, caravan, ETC.
SaleBestseller No. 10
AWBLIN Battery Disconnect Switch 12V 24V 48V Master Isolator Cut Off Switch for Marine Boat Car Truck Camper RV Trailer Vehicles Engine Application (On/Off)
  • STURDY & FULLY ENCLOSED SHUT OFF SWITCH: The Heavy Duty Cut Off Switch is made of ABS plastic housing and copper tin plating inner stud. Fully enclosed design to protect wiring from dirt, corrosion, and rain. This is the best choice in harsh ocean conditions.
  • COMPATIBILITY & SAFETY: This Battery Kill Switch Used for DC 12 - 48V systems to isolate and secure the electrical system; eliminate any power draw from the battery when vehicle is not in use, disconnects the battery safely; provide a reliable way to shutdown electrical power during maintenance and protect batteries from excessive drain.
  • EASY TO OPERATE: On/Off 2 position, Suitable for various 12 V/24 V/48 V systems. Current voltage: rating at 275 A continuous (1 hour) at 48 V DC and 1000 A for 5 seconds. Clockwise to turn on , counter clockwise to turn off.
  • WIDELY APPLICATION: Battery isolator switch is universal used for RV, Marine, Car, Boat, Camper, Travel Trailer, Truck, ATV, UTV battery and other engine application, makes it an effortless job of turning the battery on and off.
  • PACKAGE INCLUDE: Equiped with 1* Battery Switch, 4 Pcs Mounting Bolts, 4 Pcs 2*3/8 Copper Ring Terminals, 4 Pcs Heat Shrink Tubings and a hex wrench, which can provide great convenience for your installation. If you have any questions,please contact us via email. We are always here to support you.

What to Consider Before Buying The Best 12V Battery Isolators

Quality of the Product

The Quality of our product is outstanding! We use only the finest ingredients and our products are made with the utmost care. Our products are backed by a 100% satisfaction guarantee, so you can be sure you’re getting the best 12V Battery Isolators product.

Features & Specifications

The product has a sleek design and is made with high-quality materials. It is lightweight and easy to use. The product comes with a warranty.

Customer Reviews & Ratings

Have you ever wondered how accurate the customer reviews are for the 12V Battery Isolators you’re interested in? You can check out reviews from customers who have used the benches to get an idea of what they liked or didn’t like. You can also do some research online to find out more about the different types of 12V Battery Isolators.


While 12V Battery Isolators are very affordable and convenient to buy, many people are intimidated by the price tag. If you are having a limited budget you should consider choosing mid-budget 12V Battery Isolators. But, if you have enough budget to invest in 12V Battery Isolators, we recommend buying from a reputed brand. This will help you get the best value for the money.

Star Ratings

Healthy ratings indicate a good product. Highest rated products rarely disappoint users. So, we pick the best rated units on our list.

Final Words

After testing out the website for listing products, we have come to a conclusion. The website is easy to use and navigate. You can find what you are looking for easily and the search function works well. The reviews are helpful and give you a good idea of what others think of the 12V Battery Isolators. The website is also updated regularly with new products. Overall, we are happy with the website and would recommend it to others.

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