Victron Energy Argofet Battery Isolator 100-3 3 Batteries - 100AMP One Size. In contrast with diode battery isolators FET isolators have virtually no voltage loss. Voltage drop is less than 002 Volt at low current and averages 01 Volt at higher currents. Warranty InfoPlease contact your dealer for any returns repairs or support issues related to this product. Package Contents: Victron Energy Argo FET Battery Isolator - 3 Batteries Victron Energy ARG100301020R: Argofet Battery Isolator 100-3 3 Batteries - 100AMP One Size