Amazon.com: Dual Battery Isolator Kit 12V 140Amp Manual and Auto modes Voltage Sensitive Relay VSR Compatible with RV Marine Car Vehicle Truck Caravan Camper Yacht ATV UTV Boats,Not Fit for lithium batteries :
Battery Isolator Switch Add-A-Battery Blue Sea Systems 7650
VEVOR 12V 140A Dual Battery Isolator Kit 6mtr for Auxiliary Battery Relay System (#165607110962)