Dual battery isolator kit keeps your main battery protected while charging an auxiliary battery, so you can run accessories without risking a no-start. This 12V 140A voltage sensitive relay (VSR) supports lithium and lead-acid setups, with manual/auto switching and a dual LCD voltmeter to monitor both batteries in real time. Built for UTV, ATV, RV, truck, boat, and off-grid power systems where reliability matters.

Designed for harsh outdoor use, this smart isolator adds overvoltage/undervoltage protection plus an adjustable 3–60s delay to reduce relay chatter and unnecessary switching. The compact housing mounts easily and helps keep your dual-battery system stable when you’re powering winches, lights, fridges, radios, or camping gear. If you want cleaner wiring, clearer voltage tracking, and a quick way to recover from a drained starter battery, grab yours today and build a dual-battery setup you can trust.