Dual Battery Isolator Kit, 12V 140A VSR, LCD Voltmeter

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.

• Delivers 12V 140A split-charging to manage two batteries and protect starting power


• Supports lithium and lead-acid batteries with adjustable cut-in/cut-out start-stop voltage


• Switches between Auto VSR mode and Manual mode to combine batteries for emergency starting


• Displays both battery voltages on a bright LCD (4.5V–20V) for fast diagnostics


• Includes heavy-gauge 6 AWG copper wiring plus connectors, lugs, heat shrink, and zip ties

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.

• Rated voltage/current: DC 12V, 140A


• Voltage display range: 4.5V–20V (dual display)


• Adjustable delay time: 3–60 seconds


• Cable size: 13.3 mm² (6 AWG)


• Cables included: 20 ft/6 m red + 2 ft/0.6 m black ground


• Main material: PA6 plastic isolator + copper wire


• Dimensions: 3.1 x 2.8 x 2.4 in (80 x 70 x 60 mm)


• Net weight (with accessories): 3.5 lbs / 1.6 kg


• Color: Black


• In the box: isolator with mounting screws, 3 copper connectors, 2 heat shrink tubes, 4 cable lugs, 6 zip ties