12V dual battery isolator kit keeps your starter battery protected while charging a second battery automatically for accessories, fridges, and winches. The voltage sensitive relay (VSR) engages at 13.3V and disconnects at 12.8V, so the batteries separate when the engine is off. Designed for tough installs with IP65 water and dust resistance and a complete 5m cable kit for cleaner wiring.

Built for real-world vibration, moisture, and dust, this compact voltage sensing relay kit installs neatly in tight bays and electrical lockers. Low standby draw helps reduce parasitic drain, while short engage/disengage delays smooth operation during charging changes. Use it to run auxiliary lights, inverters, comms, or camping gear without risking a no-start morning. Grab yours today and set up a reliable dual battery system before your next trip.