Dual Battery Isolator 12V 140A VSR Relay with LCD

12V dual battery isolator helps manage charging between your starter and auxiliary batteries, reducing drain while keeping power ready for accessories. Designed for lithium and lead-acid setups, it features an LCD dual-voltage readout, adjustable start/stop thresholds, and a voltage sensitive relay with manual and automatic modes. Built for vehicles and off-grid rigs that see vibration, dust, and changing conditions.

• Delivers 140A VSR switching to charge a second battery while protecting the starter battery from discharge


• Supports lithium and lead-acid systems with adjustable cut-in/cut-out voltage for tuned power management


• Lets you switch to Manual mode to link batteries and assist starting when the main battery is low


• Shows both battery voltages on a bright LCD display (4.5–20V) for quick diagnostics


• Prevents rapid cycling with an adjustable 3–60s delay plus overvoltage/undervoltage protection

Keep your electrical system predictable on the road or water. This smart split-charge isolator is sized for tight installs yet built to handle tough environments, helping you monitor two batteries at a glance and control when they connect or isolate. Ideal for car, truck, RV, UTV/ATV, boat, and other 12V dual-battery setups running fridges, lights, inverters, or comms gear. Grab yours today and simplify dual-battery charging.

• Rated voltage/current: DC 12V, 140A


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


• Delay time: adjustable 3–60 seconds


• Material: PA6


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


• Net weight (with accessories): 0.5 lb / 0.24 kg


• Color: Black