Fangrui Product Details [500 Amp Battery Isolator]the 500 Amp Battery Isolator Is Designed To Isolate A Second Battery Or Applications Where Multiple Batteries Need To Be Isolated, Making It Ideal For Audio, Navigation, Winches, Generators, Etc., Without Dropping The Voltage Of The Second Battery As Traditional Isolators Do While Preventing The Main Battery From Discharging. [premium Quality]500 Amp Battery Isolator Audio Relay Uses High Quality Copper Coiled Wire To Dramatically Increase Electrical And Thermal Resistance While Extending Service Life, Meets Or Exceeds Part Number Standards, And Is Endurance-tested For Extreme Environments. [high Current Isolator]the Rated Voltage Of This Battery Isolator Is 12v, It Can Provide 500a Constant Current Stably Under 12v Voltage, And 700a Under Surge Power, Which Is Upgraded On The Traditional Isolator, And It Will Not Cause Voltage Drop To Other Batteries Except The Main Battery. [key Features]prevent The Main Battery From Discharging, When The Main And Secondary Batteries Are Conne