Blue Sea 7649 Mini Add-A-Battery Kit

The Blue Sea 7649 Mini Add-A-Battery Kit is purpose-built for anglers and boaters who demand reliable power management on the water. After decades of running electronics—GPS, fish finders, live wells, cabin lights—while maintaining engine start capability, any serious boater knows the danger of a dead battery stranding you miles from shore. This compact marine battery management system solves that critical problem by isolating your start battery from auxiliary house loads, ensuring your engine fires every time, regardless of how long your electronics have been running.

The Mini Add-A-Battery operates through a smart solenoid design that automatically isolates the primary start battery while allowing a secondary battery to power onboard equipment independently. When the engine starts, both batteries charge simultaneously; when shut down, the house battery cannot drain your start reserve. The kit's compact footprint—measuring just 8 x 4 x 12 inches and weighing 1.65 pounds—fits easily in engine compartments, under consoles, or tight spaces where full-size battery isolators won't fit. Blue Sea Systems engineered this unit with marine-grade construction to withstand salt spray, vibration, and temperature cycling that recreational and commercial vessels encounter year-round.

Dual-battery setups benefit bass boats, center consoles, cruisers, and trawlers where extended fishing days or overnights demand multiple power sources. Installation is straightforward for anyone comfortable with basic marine wiring; the kit includes all necessary components for a professional setup. Whether you're trolling electronics all day in summer heat or running cabin systems through a winter crossing, this battery management system gives you the redundancy and peace of mind that keeps you fishing instead of paddling. The Blue Sea 7649 Mini Add-A-Battery Kit is ideal for vessels already equipped with a secondary battery or as the foundation for a new dual-battery configuration.