Dual battery isolator kit keeps your starter battery protected while charging an auxiliary battery automatically for reliable power on the road or water. This 12V split charge relay uses a voltage sensitive relay (VSR) to connect at 13.3V and isolate at 12.8V, so accessories run from the leisure battery without risking a no-start. Built for RV, camper van, 4x4, marine, and workshop installs with a compact, sealed design.

Set up a dependable dual-battery system for fridges, lights, winches, inverters, or onboard electronics without constantly switching cables. The voltage-sensing logic connects only when charging voltage is present, then separates batteries after shutdown with a short delay to avoid nuisance cycling. Designed for cars, trucks, caravans, RVs, boats, yachts, ATVs/UTVs, and off-road builds where wiring needs to stay organized and protected. Grab yours today and finish your split-charge install with confidence.