Blue Sea Systems Add-A-Battery Kit - 120A Dual Circuit System for Enhanced Power Management

• AUTOMATIC CHARGING RELAY: Includes Automatic Charging Relay that senses charge voltage; combines batteries during charging and isolates at rest
• DUAL CIRCUIT PLUS SWITCH: Manages starter and house banks independently; maintains power distribution while protecting reserve capacity
• EMERGENCY PARALLEL FUNCTION: Integrated combine feature links batteries when needed; supports engine starting if one battery is discharged
• SIMPLIFIED TWO BANK CONTROL: Single ON and OFF operation controls two battery banks; reduces switching errors and wiring complexity
• MARINE RATED COMPONENTS: Tin plated copper studs resist corrosion in harsh environments; continuous rating of 120 A for inboards and larger outboards

The Blue Sea Systems 7650 Add-A-Battery kit provides automatic battery management for boats with two battery banks. Designed for inboards and larger outboards, this 120 A system simplifies switching and charging without the need for external regulators or isolators. The included Dual Circuit Plus battery switch manages the starter and house banks independently while allowing a single ON and OFF operation for everyday use. An integrated automatic charging relay senses charging voltage and combines batteries during engine operation, so both banks receive a charge. When charging stops and voltage drops, the system isolates the batteries to help protect sensitive electronics and preserve starting power. An emergency combine feature allows both batteries to be linked for engine starting if one bank is discharged. Built for harsh marine environments, the kit features corrosion resistant, tin plated copper studs for reliable conductivity and long service life.