--- title: "dual battery isolator kit — Niche Verdict: Skip it (37/100) | Amazon United States - Flapen" canonical_url: "https://flapen.com/amazon/research/us/automotive/dual-battery-isolator-kit" last_updated: "2026-07-10T02:41:25.306Z" locale: en meta: description: "a small market ($105K/yr) — dual battery isolator kit doesn't clear our bar today." "og:description": "a small market ($105K/yr) — dual battery isolator kit doesn't clear our bar today." "og:title": "dual battery isolator kit — Niche Verdict: Skip it (37/100) | Amazon United States - Flapen" --- Back to Flapen home # **dual battery isolator kit** **Skip it****37/100 ** a small market ($105K/yr) — dual battery isolator kit doesn't clear our bar today. **Market/yr** **$105K** **Growth (1y)** **+127.6%** **Products** **10** **Brands** **7** was 15 a year ago **Sellers** **12** **Price range** **$34.65–$179.04** **Returns** **3.2%** **Rating** **4.4★** **Skip it** Scored 37/100 across market size, growth, competition, quality gap, and returns. Market sizeGrowthCompetitionQuality gapReturns Market size **5** ×0.30 Growth **68** ×0.30 Competition **11** ×0.20 Quality gap **52** ×0.10 Returns **74** ×0.10 ## **Demand** Weekly Amazon search volume, last 104 weeks — +127.6% year over year. 3K1KPrime Day '25Spike '26Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26 ## **Seasonality** Monthly demand index across the year — 1.00 is average. JFMAMJJASOND No pronounced peak months · busiest ÷ quietest = 1.4× ## **Competition** - VEVOR50% - KeyLine Chargers21% - UCkasayfy12% - Nilight8% - ISINSWIFT3% - ARONOVA2% - Other (1 brands)2% The top 5 products capture 83% of clicks — a locked-up shelf that new listings rarely crack. 7 brands and 12 sellers compete here. **Brands** **7 **▼falling was 15 a year ago **Sellers** **12** **Top 5 brand share** **96%** #ProductBrandPriceRatingReviewsClick shareTrend 1 ![VEVOR Split Charge Relay Kit 6mtr 12V Automatic Dual Battery Isolator Kit with 140AMP Voltage Sense Relay VSR Compatible with RV Marine Car Vehicle Truck Caravan Camper Yacht ATV UTV Boats Workshop](https://m.media-amazon.com/images/I/41UNO6O3BRL.jpg) [**VEVOR Split Charge Relay Kit 6mtr 12V Automatic Dual Battery Isolator Kit with 140AMP Voltage Sense Relay VSR Compatible with RV Marine Car Vehicle Truck Caravan Camper Yacht ATV UTV Boats Workshop**](https://www.amazon.com/dp/B0CY2C3NMZ) VEVOR$49.124.4★49741%▼falling 2 ![Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup](https://m.media-amazon.com/images/I/41l+WSiaSiL.jpg) [**Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup**](https://www.amazon.com/dp/B00WTAFR5W) KeyLine Chargers$113.154.5★1,12515%▼falling 3 ![UCkasayfy Dual Battery Isolator Kit 12V 140amp Voltage Sensitive Relay VSR Smart Battry Isolator Compatible with UTV Marine car RV Boat Truck Trailer ATV Camper Moto Not Fit for Lithium Batteries](https://m.media-amazon.com/images/I/51GI8vxAhiL.jpg) [**UCkasayfy Dual Battery Isolator Kit 12V 140amp Voltage Sensitive Relay VSR Smart Battry Isolator Compatible with UTV Marine car RV Boat Truck Trailer ATV Camper Moto Not Fit for Lithium Batteries**](https://www.amazon.com/dp/B0DLWCQZXS) UCkasayfy$47.924.3★10912%▲rising 4 ![Nilight 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](https://m.media-amazon.com/images/I/51WCPjlUHjL.jpg) [**Nilight 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**](https://www.amazon.com/dp/B0CZMXN5SK) Nilight$92.514.2★2998%▼falling 5 ![VEVOR Dual Battery Isolator Kit 12V 300 Amp 20 ft 2AWG Manual and Automatic VSR Voltage Sensitive Relay with Voltmeter LCD Screen Smart Battery Isolator Compatible with Lithium Batteries for UTV](https://m.media-amazon.com/images/I/41olIuUxscL.jpg) [**VEVOR Dual Battery Isolator Kit 12V 300 Amp 20 ft 2AWG Manual and Automatic VSR Voltage Sensitive Relay with Voltmeter LCD Screen Smart Battery Isolator Compatible with Lithium Batteries for UTV**](https://www.amazon.com/dp/B0FYF7Y8JM) VEVOR$120.154.0★106%▲rising 6 ![Dual Battery Isolator Kit Heavy Duty 300 AMP 1000 AMP Peak Voltage Sensitive Relay VSR for 12 Volt Systems - Works with All Batteries Types Including Lithium and LiFePO4](https://m.media-amazon.com/images/I/51185+JPrHL.jpg) [**Dual Battery Isolator Kit Heavy Duty 300 AMP 1000 AMP Peak Voltage Sensitive Relay VSR for 12 Volt Systems - Works with All Batteries Types Including Lithium and LiFePO4**](https://www.amazon.com/dp/B08TM748F8) KeyLine Chargers$179.044.4★636%▲rising 7 ![VEVOR Dual Battery Isolator Kit 12V 140 Amp 20 ft 6AWG Manual and Automatic VSR Voltage Sensitive Relay with Voltmeter LCD Screen Smart Battery Isolator Compatible with Lithium Batteries for UTV](https://m.media-amazon.com/images/I/51rNxSVk9IL.jpg) [**VEVOR Dual Battery Isolator Kit 12V 140 Amp 20 ft 6AWG Manual and Automatic VSR Voltage Sensitive Relay with Voltmeter LCD Screen Smart Battery Isolator Compatible with Lithium Batteries for UTV**](https://www.amazon.com/dp/B0FYFDRGJG) VEVOR$59.864.7★174%▲rising 8 ![ISINSWIFT Dual Battery Isolator Kit 140 Amp 12v Voltage Sensitive Relay (VSR) Automatic Disconnect Switch | Cars RV UTV ATV Marine Switches for Bateries](https://m.media-amazon.com/images/I/51MNm2KYzBL.jpg) [**ISINSWIFT Dual Battery Isolator Kit 140 Amp 12v Voltage Sensitive Relay (VSR) Automatic Disconnect Switch | Cars RV UTV ATV Marine Switches for Bateries**](https://www.amazon.com/dp/B0CXCTS97C) ISINSWIFT$47.474.6★233%▼falling 9 ![ARONOVA Passenger Side Battery Tray Replacement With Base Clamp Kit Compatible with select Cadillac Escalade/Chevrolet Avalanche Silverado Suburban Tahoe/GMC Sierra Yukon models](https://m.media-amazon.com/images/I/31Bke7FKvNL.jpg) [**ARONOVA Passenger Side Battery Tray Replacement With Base Clamp Kit Compatible with select Cadillac Escalade/Chevrolet Avalanche Silverado Suburban Tahoe/GMC Sierra Yukon models**](https://www.amazon.com/dp/B0BPTDDJFP) ARONOVA$34.654.1★1022%▲rising 10 ![12V 240A Dual Battery Isolator Kit with Remote Control LCD Display Voltage Sensitive Relay (VSR) for Dual Battery Setup Compatible with Truck Van RV ATV UTV Boat](https://m.media-amazon.com/images/I/51Nj33c67TL.jpg) [**12V 240A Dual Battery Isolator Kit with Remote Control LCD Display Voltage Sensitive Relay (VSR) for Dual Battery Setup Compatible with Truck Van RV ATV UTV Boat**](https://www.amazon.com/dp/B0FLDHQFSQ) IMAYCC$83.484.6★62%▲rising ## **Product shelf** All 10 tracked products in this niche. Top sellersNewestTrending [![VEVOR Split Charge Relay Kit 6mtr 12V Automatic Dual Battery Isolator Kit with 140AMP Voltage Sense Relay VSR Compatible with RV Marine Car Vehicle Truck Caravan Camper Yacht ATV UTV Boats Workshop](https://m.media-amazon.com/images/I/41UNO6O3BRL.jpg)**VEVOR Split Charge Relay Kit 6mtr 12V Automatic Dual Battery Isolator Kit with 140AMP Voltage Sense Relay VSR Compatible with RV Marine Car Vehicle Truck Caravan Camper Yacht ATV UTV Boats Workshop** VEVOR**$49.12**4.4★497 reviews](https://www.amazon.com/dp/B0CY2C3NMZ) [![Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup](https://m.media-amazon.com/images/I/41l+WSiaSiL.jpg)**Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup** KeyLine Chargers**$113.15**4.5★1,125 reviews](https://www.amazon.com/dp/B00WTAFR5W) [![UCkasayfy Dual Battery Isolator Kit 12V 140amp Voltage Sensitive Relay VSR Smart Battry Isolator Compatible with UTV Marine car RV Boat Truck Trailer ATV Camper Moto Not Fit for Lithium Batteries](https://m.media-amazon.com/images/I/51GI8vxAhiL.jpg)**UCkasayfy Dual Battery Isolator Kit 12V 140amp Voltage Sensitive Relay VSR Smart Battry Isolator Compatible with UTV Marine car RV Boat Truck Trailer ATV Camper Moto Not Fit for Lithium Batteries** UCkasayfy**$47.92**4.3★109 reviews](https://www.amazon.com/dp/B0DLWCQZXS) [![Nilight 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](https://m.media-amazon.com/images/I/51WCPjlUHjL.jpg)**Nilight 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** Nilight**$92.51**4.2★299 reviews](https://www.amazon.com/dp/B0CZMXN5SK) [![VEVOR Dual Battery Isolator Kit 12V 300 Amp 20 ft 2AWG Manual and Automatic VSR Voltage Sensitive Relay with Voltmeter LCD Screen Smart Battery Isolator Compatible with Lithium Batteries for UTV](https://m.media-amazon.com/images/I/41olIuUxscL.jpg)**VEVOR Dual Battery Isolator Kit 12V 300 Amp 20 ft 2AWG Manual and Automatic VSR Voltage Sensitive Relay with Voltmeter LCD Screen Smart Battery Isolator Compatible with Lithium Batteries for UTV** VEVOR**$120.15**4.0★10 reviews](https://www.amazon.com/dp/B0FYF7Y8JM) [![Dual Battery Isolator Kit Heavy Duty 300 AMP 1000 AMP Peak Voltage Sensitive Relay VSR for 12 Volt Systems - Works with All Batteries Types Including Lithium and LiFePO4](https://m.media-amazon.com/images/I/51185+JPrHL.jpg)**Dual Battery Isolator Kit Heavy Duty 300 AMP 1000 AMP Peak Voltage Sensitive Relay VSR for 12 Volt Systems - Works with All Batteries Types Including Lithium and LiFePO4** KeyLine Chargers**$179.04**4.4★63 reviews](https://www.amazon.com/dp/B08TM748F8) [![VEVOR Dual Battery Isolator Kit 12V 140 Amp 20 ft 6AWG Manual and Automatic VSR Voltage Sensitive Relay with Voltmeter LCD Screen Smart Battery Isolator Compatible with Lithium Batteries for UTV](https://m.media-amazon.com/images/I/51rNxSVk9IL.jpg)**VEVOR Dual Battery Isolator Kit 12V 140 Amp 20 ft 6AWG Manual and Automatic VSR Voltage Sensitive Relay with Voltmeter LCD Screen Smart Battery Isolator Compatible with Lithium Batteries for UTV** VEVOR**$59.86**4.7★17 reviews](https://www.amazon.com/dp/B0FYFDRGJG) [![ISINSWIFT Dual Battery Isolator Kit 140 Amp 12v Voltage Sensitive Relay (VSR) Automatic Disconnect Switch | Cars RV UTV ATV Marine Switches for Bateries](https://m.media-amazon.com/images/I/51MNm2KYzBL.jpg)**ISINSWIFT Dual Battery Isolator Kit 140 Amp 12v Voltage Sensitive Relay (VSR) Automatic Disconnect Switch | Cars RV UTV ATV Marine Switches for Bateries** ISINSWIFT**$47.47**4.6★23 reviews](https://www.amazon.com/dp/B0CXCTS97C) ## **Reviews** What buyers praise and complain about, mined from review topics. ### **What buyers love ** **Assembly/Installation**25% *“Took about 30 minutes to install, works great”* **Quality-Overall**17% *“well made”* **Battery Life**14% *“Now You Can Accessorize While Protecting Your Starter Battery”* **Advertised Vs Actual Product**10% *“Worked as advertised”* **Efficiency**8% *“Does the job perfectly”* **Durability**6% *“seems pretty durable”* **Connectivity-Overall**3% *“Hooked up fine”* **Charging**2% *“Keeps my chassis batteries charged”* **Size-Overall**2% *“Fit good”* **Strength**1% *“Seems heavy duty”* ### **What buyers complain about ** **Defective Material/Parts**11% *“then the metal bracket that holds the battery was not manufactured correctly”* **Size-Overall**11% *“Inaccurate wire sizes poor connectors”* **Battery Life**11% *“still pulling from crank battery”* **Functionality-Overall**10% *“It didn't work for me”* **Instructions/User Manual/Troubleshooting**9% *“the directions were a very poor translation”* **Quality-Overall**9% *“Junk”* **Assembly/Installation**7% *“Had to tweak it to install”* **Durability**7% *“Failed from the start”* **Socket/Port/Plug**4% *“the pre-installed wire connectors do not fit in the fuse blocks”* **Value For Money**4% *“too expensive”* #### **Top return reasons**- Size-Overall16% - Functionality-Overall13% - Compatibility-Overall13% - Defective Material/Parts11% - Charging8% - Amplification7% - Advertised Vs Actual Product5% - Weight Heavy4% - Value For Money3% - Assembly/Installation3%