Blue Sea Systems Add-A-Battery kits include a Dual Circuit Plus Battery Switch and an Automatic Charging Relay. These components simplify switching and automate charging, so that all you have to do is turn the battery switch ON when you board and OFF when you leave. Adding a second battery prevents getting stranded with a dead battery by isolating the start battery from the house loads that can quickly discharge a battery. The Add-A-Battery kits offer a simple way to control switching the Dual Circuit Plus Battery Switch and automatically shares a single source of charging between two batteries with the Automatic Charging Relay.

• The relay automatically combines batteries during charging, isolates batteries when discharging. The Start Isolation option protects electronics from voltage sags and spikes during engine cranking.
• The relay supports 12 or 24V systems.
• Relay Continuous Rating: 65A; Intermittent Rating: 115A
• Relay: CE marked for Ignition Protection, Meets ISO 8846 and SAE J1171 external ignition protection requirements. Rated IP67 - temporary immersion up to 1 meter for 30 seconds.
• The Dual Circuit Plus Battery Switch switches two battery banks simultaneously with one ON/OFF switch while maintaining battery bank isolation, minimizing the risk of a dead start battery.
• Battery Switch Continuous Rating: 300A; Intermittent Rating: 450A
• Battery Switch: CE marked for Ignition Protection, Meets UL 1500 and SAE J1171 external ignition protection requirements. Rated IP66 - protected against powerful water jets.