Dual Pro SS4 Auto 4 Bank Battery Charger w/3 Bank B.O.S. – Marine Electrical Replacement Part is organized for electrical wiring & connectors shoppers who need a clear, professional marine parts buying experience.

SS4 Auto 4 Bank Battery Charger with 3 Bank B.O.S. This kit combines Dual Pro’s B.O.S. Battery Optimization System - 12V - 3-Bank (PN: BOS12V3) and Dual Pro’s SS4 Auto 40A - 4-Bank Lithium/AGM Battery Charger (PN: SS4AUTO). B.O.S. (Battery Optimization System) - 12V - 3-Bank B.O.S. actively shuttles energy between batteries to keep “the pack” balanced, increasing battery strength and longevity. Batteries in a pack will become “out of balance” and the pack is only as good as its “weakest link”. In watercraft applications, this is further compounded when the trolling motor battery is used for peripherals and/or to assist the cranking battery. B.O.S. actively shuttles energy as needed between b

Fitment & Product Details

• Brand / Manufacturer: Dual Pro
• Voltage: 12V

• Search-optimized by brand, system, part type, and fitment cues.
• Verify compatibility with your original part number, engine model, and application before ordering.
• Built for boat owners, e-commerce shoppers, and professional marine service teams.