Add-A-Battery Kit - 120A

• Simplifies switching
• Isolates engine and house circuits
• Combines batteries for emergency starting
• Tin-plated copper studs for maximum conductivity and corrosion resistance
• Automatically combines batteries during charging
• Isolates batteries during engine cranking and when not charging
• Shares the charge between two batteries more efficiently than a battery isolator
• Allows efficient dual battery charging without needing regulator adjustment or rewiring