Check the listing for details. 500 Amp Battery Isolator for Mobile Audio Relay Continuous Battery Isolator 12v. Condition: New. Listed at 49.86 USD. Thank you for visiting our ebay store! What Is A Battery Isolator? Battery isolator systems allow you to charge the secondary batteries in your van when the motor is running. There are many variations of hooking a system up, but they all share one common goal: to isolate your secondary battery so that when youre running all of your electronics you dont drain the starter battery. Lengthen the Life your Batteries When two vehicle batteries are wired in parallel they have a tendency to charge and drain one another. Installing a relay that disconnects the batteries when the engine is off prevents excessive wear and lengthens the life of the batteries. Whenever you turn your engine back on, the batteries will be connected without any voltage drop to the second battery. Product Description: 500 AMP High Mobile Audio Relay Battery Isolator 500 Amps at 12V Continuous Power Handling 700 Amps Surge Power Handling Draws Less Than 1 Amp When On Universal 12V Applications Switching Power: 10 - 16 VDC Item Weight: 780g Relay and Battery Isolator,easy to install Great for isolating a second batter making it dedicated to the stereo system Does not create a voltage drop to the second battery like conventional isolator Package List:1 * 500 Amp Mobile Audio Relay Battery Isolator About Quality: We only sell the best quality of products;And if you unsatisfy with our product, you can return to us, no risk. About After-sales service: LIFETIME WARRANTY.If you have any problem about our products,please contact us firstly, we will do our best to solve any problem for you; 500 Amp Battery Isolator for Mobile Audio Relay Continuous Battery Isolator 12v