Small and compact battery isolator suitable for use in a wide range of vehicles and applications, including ATV/UTV, boats, RVs, marine vehicles, trucks, and caravans. How it works - When the main battery voltage is above 13.3V, the main battery charges the auxiliary battery. - When the main battery voltage drops below 12.7V, the main and auxiliary batteries are disconnected. - With the engine running, the VSR engages when the starting battery reaches 13.3V and the LED lights to indicate the two batteries are linked. When the vehicle is turned off, the system disengages at 12.8V, leaving the main battery ready to start again. Specifications - Continuous current: 100-120A - Instantaneous current: 160A - Current consumption (charging): 250mA - Current consumption (standby): 8mA Benefits - Protects main battery from deep discharge while maintaining charge to the auxiliary battery - Automatically links and unlinks batteries based on vehicle voltage, ensuring starting reliability - Compact design suitable for tight spaces; low standby draw for long-term use Use scenarios - ATV/UTV or boat setups with a dedicated auxiliary battery - RV or caravan with a secondary house battery charged from the vehicle battery - Truck or heavy vehicle with auxiliary power for accessories such as lights or fridges