Blue Sea 7650003 Add-A-Battery Kit - Boxed Packaging

The Blue Sea 7650003 Add-A-Battery Kit provides a complete two-battery bank management solution for recreational and professional marine vessels. This boxed battery switching system automates charging while isolating engine and house circuits, delivering the dual-battery functionality that modern boaters depend on without requiring constant manual intervention.

At the core is the Dual Circuit Plus Battery Switch, which isolates the engine and house electrical systems under normal operation to prevent one battery bank from draining the other. When emergency starting power is needed, the switch automatically combines both battery banks into a single source—critical functionality for situations where a starter battery is depleted. The 120 Amp SI ACR (Automatic Charging Relay) monitors charging voltage and seamlessly combines battery banks when the engine is running, ensuring both batteries receive charge from the alternator without manual switching. This design eliminates operator error and extends battery service life by preventing chronic undercharging.

The Add-A-Battery Kit is engineered for weekend fishermen running GPS and electronics alongside engine loads, as well as offshore and extended-range operators who depend on house battery banks for trolling motors, lighting, galley equipment, and navigation systems. It eliminates the complexity of manual battery isolation switches and the guesswork of alternator charging distribution. Weekend boaters benefit from set-and-forget operation; serious anglers gain the reliability needed for multi-day offshore runs where battery management failures can compromise safety and mission success.

Blue Sea Systems is recognized for engineering marine electrical components to the rigorous corrosion and vibration standards required in salt-water environments. This 7650003 configuration ships in protective boxed packaging, ensuring components arrive in field-ready condition without external damage or corrosion.