UCkasayfy Dual Battery Isolator 12V 140A VSR with Voltage Display, IP67 Waterproof

UCkasayfy Dual Battery Isolator Kit is a 12V, 140A voltage-sensitive relay system that automatically manages and protects two lead-acid batteries while preventing one battery from draining the other.

This smart battery isolator kit combines a Voltage Sensitive Relay (VSR) with a clear voltage display and rugged IP67-rated housing so you can run accessories, start engines, and maintain battery health across vehicles, boats, RVs, trailers, ATVs and UTVs. It detects charging voltages and connects or disconnects the auxiliary battery at preset thresholds, allows manual reverse charging in emergencies, and includes over/under-voltage safeguards. Note: this unit is not compatible with lithium batteries.

How does the UCkasayfy VSR decide when to join or separate batteries?

The built-in VSR monitors system voltage and automatically connects the main and auxiliary batteries when charging voltage rises, then separates them when voltage drops. This ensures the starter battery remains charged for vehicle starts while auxiliary loads are powered from the secondary battery.

• Automatic cut-in at 13.3V and cut-out at 12.8V for reliable operation.
• Real-time voltage display for instant status checks.
• Manual override for controlled reverse charging in emergencies.

What protections and environmental ratings does it offer?

Safety features disconnect the circuit if voltage is outside safe bounds and the enclosure is engineered to withstand harsh outdoor use. The unit includes both electrical and environmental protections to reduce risk and improve lifespan in demanding installations.

• Automatic disconnect when input voltage is below 11V or above 17V to prevent damage.
• IP67 waterproof rating protects electronics from dust and water ingress.
• Robust construction suitable for marine and off-road vibration conditions.

Where and how can I use this dual battery isolator kit?

The UCkasayfy 140A isolator is designed for a wide variety of vehicle and marine setups that use conventional lead-acid batteries. It helps preserve starter batteries, manage auxiliary loads, and support accessories without complex wiring or high-maintenance components.

• Fits cars, trucks, RVs, boats, trailers, ATVs, UTVs, campers and marine applications using lead-acid batteries.
• Ideal for powering winches, fridges, lights and inverters from a separate battery bank.
• Simplifies battery management when storing vehicles or towing trailers to avoid drained starter batteries.

Can I use this isolator with lithium or modern battery chemistries?

This model is built and calibrated for lead-acid battery charging profiles and safety limits; it is explicitly not suitable for lithium batteries. Installing it with lithium chemistry could prevent correct charging behavior or trigger protection disconnects.

• Not recommended for lithium, LiFePO4, or other non-lead-acid batteries.
• Use only with compatible 12V lead-acid, AGM or flooded batteries for expected performance.
• If you have lithium batteries, select a dedicated lithium-compatible isolator or battery management solution.

Who is this for? The UCkasayfy Dual Battery Isolator Kit is aimed at owners of conventional 12V vehicles, boats, and off-road rigs who need an automatic, low-maintenance way to protect their starter battery while using auxiliary electrical loads. It suits DIY installers, fleet operators, outdoor enthusiasts and anyone who wants a straightforward VSR solution with clear voltage readout and rugged weatherproofing. If you use lithium batteries, choose a product specifically rated for that chemistry instead.