PAC PAC-80 80-Amp Relay Battery Isolator Mobile Audio Relay and Battery Isolator 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 isolators 80 Amps at 12V Continuous Power Handling 150 Amps Surge Power Handling Handles 80-Amps Continuous and 150-Amp Surges Durable Weatherproof Construction For Switching Power Sources and Systems with Heavy Current Draw Keeps Primary Starting Battery from being Drained Does Not Create any Voltage Drop to the Secondary Battery