Isolator 2 Battery 12vs of 2025
Best Choice1
DB ElectricalDB Electrical BSL0003 160 Amp Dual Multi Two Battery Isolator Stero Systems Marine EMS Vehicles, Fire Trucks
Why we love it
Efficiently manages dual battery systems.
Compatible with multiple vehicle types.
Reliable with a 1-year warranty.
9.8Exceptional
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Value for Money2
Victron EnergyVictron Energy ArgoDiode Battery Isolators 160-2AC (2 Batteries 160 amp)
Main highlights- Victron Energy ArgoDiode battery isolators 160-2AC allow simultaneous charging of two batteries from one alternator
- Victron Energy Argo Battery Isolators feature a low voltage drop thanks to the use of Schottky diodes
- Diode Battery Isolators allow simultaneous charging of two or more batteries from one alternator, without connecting the batteries together. Discharging the accessory battery, for example, will not result in also discharging the starter battery
- Alternator energize input: Victron Energy new AC diode isolators feature a special current limited energize input that will power the B+ when the engine run/stop switch is closed
- All models are fitted with a compensation diode that can be used to slightly increase the output voltage of the alternator, this compensates for the voltage drop over the diodes in the isolator
9.7Exceptional
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3
STINGER45% OffStinger SGP32 200 AMP Battery Relay Isolator and Relay
Main highlights- Universal 12V Applications
- Prevents primary battery discharge
- Maximum current transfer
- Extends battery life
- 200 AMP Battery Isolator and Relay
9.6Exceptional
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4
GMURA250 Amp Dual Battery Isolator Kit, Universal 12V/24V VSR Voltage Sensitive Relay Switch Kit, Heavy Duty Smart Battery Isolator for Marine Car Truck RV ATV
Main highlights- 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
- Voltage Display: After connection, the voltage display is 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
- Unrestrained Start Engine: Current: 250 Amps; 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
- 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
- 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
9.5Excellent
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5
KeyLine ChargersDual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine
Main highlights- Trusted Performance with Warranty & Money-Back Guarantee – Every dual battery kit by KeyLine Chargers is backed by a 12-month industry-leading warranty. If you’re not 100% satisfied with your purchase, take advantage of our 30-day money-back guarantee—no questions asked! Drive with confidence knowing you have a premium battery isolator 12V kit keeping your power system running at full capacity.
- Smart Voltage Sensitive Relay (VSR) for Optimal Charging – Featuring a 12V dual battery wiring kit, this system automatically activates at 13.3V and disengages at 12.8V, ensuring your starting battery remains fully charged. Whether you're installing a marine dual battery kit for your boat, a dual battery kit for truck applications, or need a battery isolator 12V kit for off-grid power, this setup prevents battery drain and guarantees reliable performance.
- 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.
- Built for Extreme Conditions & Rugged Durability – Engineered for off-road adventures, marine use, and daily driving, this dual battery isolator kit is IP65-rated for water, dust, and vibration resistance. Its solid-state design ensures durability, making it an excellent choice for automotive, RV, UTV, and marine battery isolator needs. Whether battling tough trails or navigating open waters, count on this dual battery wiring kit to provide uninterrupted power.
- Advanced Dual Battery Isolator 12V Kit – Designed for superior performance, this dual battery kit ensures efficient power distribution between two batteries without voltage drops. Unlike traditional battery isolator diodes, this automatic disconnect switch eliminates power loss while maintaining a seamless connection between your primary and auxiliary power sources. Compact at 2.6” x 2.6” x 2”, it’s perfect for under-hood installations or as part of a battery relocation kit.
9.3Excellent
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6
RANSOTORANSOTO Dual Battery Isolator Kit 12 Volt 140 Amp Voltage Sensitive Relay Complete VSR Double Battery Automatic Charger Battery Disconnect Switch Battery Isolator 12v
Main highlights- This package is including: 1x Voltage Sensitive Relay,1x Positive Battery Connection Cable (20 ft),1x Negative Battery Connection Cable (2 ft),2x M4x40mm Screws,3x M4x20mm Screws,1x 25-6 Toroidal Terminal Blocks,1x Negative Marine Battery Terminal,2x Positive Marine Battery Terminal,2x Red Heat Shrink Tubing,1x Black Heat Shrink Tubing,6x Cable Ties,3x Tinned copper lugs ,1x Instructions.
- Rugged and durable: 12 volt dual battery isolator kit is made of high quality materials and advanced technology, with good high temperature resistance, shock resistance and waterproof performance.
- Installation: Easy to install and did't need special tool.
- Function: It can isolate the charging of two batteries, enabling vehicle accessories to draw power from the secondary battery when the engine is not running, while ensuring that the main battery is continuously charged at the same time.
- Dual Battery Isolator Kit can be widely used in a variety of 12-volt power system vehicles. Such as RV, crossovers, trucks, SUVs, camper, boat, yacht, etc.
9.2Excellent
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7
Mata1Mata1 Dual Battery Isolator Kit 12V 140Amp IP-67 Waterproof Rating VSR (Voltage Sensitive Relay) Smart Car Charger for All Automotive Land or Marine Vehicles
Main highlights- UNIVERSAL COMPATIBILITY - Power up any ground or marine vehicle including ATVs, boats, cars, mini-vans, trucks, RVs, and yachts; Perfect versatile solution for all automotive power needs
- RELIABLE POWER SOURCE - Get a reliable power source for all on-road travels and off-road expeditions with a smart dual battery isolator; Keep your main battery charged and engine running to ensure your automobile never run out of power in remote areas again
- HEAVY-DUTY - Manufactured using premium-grade polyamide 66 and copper PVC; Mata1 endeavours to provide you a robust device that can withstand the test of time and provide you lasting performance
- EASY INSTALLATION w/ COMPLETE KIT - Compact design (2.7” x 2.7” x 2”) that fits easily in your automobiles barely taking any space; Enjoy hassle-free installation w/ a complete isolator kit including cables, lugs, terminals, and instructions
- ALL-WEATHER RESILIENT - Explore any environment with confidence with the IP-67 waterproof rating dual battery isolator; Designed to perform well and stay resilient in even the toughest weather conditions and terrains
9.1Excellent
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8
NilightNilight 12V 140AMP Dual Battery Isolator Kit with 6 AWG Power Cable Terminal Voltage Sensitive Relay Smart VSR Automatic Charger Disconnect for Truck Van RV ATV UTV Boat Can Am
Main highlights- Wide Application: 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 camper van trucks, caravans, RV, ATV, UTV, Boat and camping applications.
- Versatile: Our VSR Battery Isolator can be used to protect any 12 Volt battery; It eliminates the possibility of running the battery out and keeps it fully charged for when you need it most. Important Note: This item is not compatible with Lithium Batteries
- Safe and efficient: The dual battery isolator is made of high-quality material casing and a silicone seal, withstanding extreme weather conditions and vibrations. Its IP66 waterproof rating ensures safe off-road use in dusty, wet, and unpredictable environments, providing you with a reliable and durable solution for your marine or automotive dual battery needs.
- Package Includes: 1x 140amp smart battery isolator; 1x 6AWG Red Battery Cable with Two Connectors; 1X 6AWG Black Battery to Ground Cable with Two Connectors; 1x negative marine battery terminal; 2x positive marine battery terminals; 3x 5/16” battery clamp; 8x screws; 6x nuts; 4x spring washers; 2x red heat shrink; 1x black heat shrink; 2x insulated blue ring terminals; 6×cable ties.
- Function: The Voltage Sensitive Relay (VSR) ensures that the primary battery is always charged and ready to start the vehicle by cutting in at 13.3 volts and cutting out at 12.8 volts. When your engine is turned on and the starting battery is fully charged, the isolation will start charging the second (auxiliary) battery at the same time. Enables you to charge two batteries from one alternator at the same time.
8.9Very Good
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9
SEACHOICESeachoice Battery Select Switch, Disconnect Isolator Cutoff, Dual, 12 -50V
Main highlights- UL listed, ignition protected and CE approved
- Size: 5-1/4 inch x 2-5/8 inch
- Permits selection between batteries for starting, charging or operation in parallel
- Manufacturer part number 50-11501
- For use with two or more batteries and systems under 50V
- Capacity: 250A continuous, 360A intermittent
8.7Very Good
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10
Victron EnergyVictron Energy ArgoDiode Battery Isolators 80-2SC (2 Batteries 80 amp)
Main highlights- The Argo Battery Isolators feature a low voltage drop thanks to the use of Schottky diodes
- Discharging the accessory battery, for example, will not result in also discharging the starter battery
- Diode Battery Isolators allow simultaneous charging of two or more batteries from one alternator, without connecting the batteries together
- All models are fitted with a compensation diode that can be used to slightly increase the output voltage of the alternator, this compensates for the voltage drop over the diodes in the isolator
8.6Very Good
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