Add A Battery Kit Mini, MFG# 7649, designed for outboard powered boats with alternator output of 65A or less, isolates the start battery from the house loads which prevents the discharge of the start battery. Waterproof and includes battery temperature compensation, start isolation and comes with an external indicator remote. Battery temperature compensation allows you to charge a battery based on its temperature. Simplifies switching. Isolates engine and house circuits. Combines batteries for emergency starting. Tin-plated copper studs for maximum conductivity and corrosion resistance. Automatically combines batteries during charging. Isolates batteries during engine cranking and when not charging Includes M-series mini dual circuit plus battery switch. Its always receiving safe and optimal charging voltages. Start isolation ensures that sensitive electronics are not subjected to the voltage sags from engine cranking.