Battery Tender?« Black Power Connector Receptacle is an onboard receptacle that enables the D/C connector for DC to DC connections. The unique silver-plated solid copper alloy electrical contacts and high impact UV protected glass-reinforced thermoplastic housing with a lock device provides a positive connection that avoids vibration and water incursion. Come with all stainless-steel hardware. Perfect for battery connections to trolling motors, navigational electronics or any DC accessory.