The official online store for Original True® Dual Smart Battery Isolator Kits, designed for automotive, marine, UTV, and golf cart applications. The site specializes in voltage-sensitive relay technology that simplifies dual battery management, ensuring reliable power distribution between main and auxiliary batteries. Products include small, medium, and large Automatic battery isolator dual battery kits, UTV-specific solutions, lithium-compatible isolators, and accessories such as volt meters and cables. Proudly made in the USA, these kits are DIY-friendly and trusted by enthusiasts and professionals alike. Dfna.info provides durable, easy-to-install solutions for anyone needing dependable dual battery performance across vehicles and equipment.