Blue Sea Systems 7649 Mini Add-A-Battery Kit with ACR and Dual Circuit Switch

The Blue Sea Systems Mini Add-A-Battery kit is a complete dual-battery management solution for boats adding a second battery to support electronics, trolling motors, or upgraded audio systems. This integrated system combines an automatic charging relay (ACR) and a dual circuit battery switch to intelligently manage charging and power distribution between two batteries up to 65 amps continuous rating.

System Components and Operation:

The included Blue Sea Systems 7601 ACR automatically combines both batteries during charging from a single source—typically your engine's alternator—ensuring both batteries receive a full charge without requiring external voltage regulators or isolators. Unlike traditional battery isolators that create voltage drop, the ACR provides efficient charging without power loss. During engine starting, the ACR automatically isolates the house battery to protect sensitive electronics from voltage fluctuations. The relay features ignition protection, allowing safe installation in gasoline engine compartments.

The m-Series 6011 Dual Circuit Plus battery switch provides intelligent power management with three positions. In the normal operating position, the switch keeps house and starting batteries separated, with each powering only its dedicated circuits. This prevents accidentally draining your starting battery by running accessories too long. The emergency combine feature allows you to draw power from both batteries when needed—critical for emergency engine starting or radio calls. The switch features tin-plated copper studs for maximum conductivity and corrosion resistance, with ignition protection for engine room installation.

Key Features:

• Complete dual-battery management system with ACR and battery switch
• Charges two batteries efficiently from single source without voltage drop
• Automatic start isolation protects sensitive electronics during engine cranking
• Emergency combine feature draws power from both batteries when needed
• Simplifies switching and eliminates risk of draining starting battery
• Ignition protected components suitable for gasoline engine compartments
• Tin-plated copper terminals resist corrosion in marine environments
• Multiple mounting options including surface and rear mount

7601 ACR Specifications:

• Nominal voltage: 12V/24V with automatic detection
• Continuous rating: 65A (115A intermittent for 2 minutes)
• Closing voltage: 13.0V/26.0V (30 second delay)
• Opening voltage: 12.75V/25.5V (30 second delay)
• Operating current: 90mA combined, 15mA open
• Over-voltage lockout: 16V at 12V nominal
• Under-voltage lockout: 5V at 12V, 19V at 24V
• Terminal stud size: 1/4 inch
• Recommended cable size: 1/0 AWG to meet rating
• Dimensions: 2-7/8" L × 2-7/8" W × 2-5/8" D

6011m Dual Circuit Plus Switch Specifications:

• Switch positions: 3 (Off, On, Combine)
• Continuous rating: 300A
• Intermittent rating: 450A for 5 minutes
• Cranking rating: 675A for 30 seconds
• Maximum voltage: 32V DC
• Battery inputs: 2 with emergency combine function
• Terminal stud size: 3/8 inch
• Recommended cable size: 4/0 AWG to meet ratings
• Mounting: Surface or rear mount with #10 screws
• Dimensions: 2-7/8" L × 2-7/8" W × 3-1/8" D

Designed and built for the demanding marine environment, this complete battery management kit provides professional-grade dual-battery functionality with simplified installation and reliable automatic operation.