NVX XSBI500 Microprocessor-Controlled 500 Amp, Dual Sensing Smart Relay Battery Isolator

Love how it disconnects my back battery when car is off and since I have a high output alternator it almost instantly start charging my back battery along with my front battery so my voltage stays pretty steady on a salt 2 amp. I would definitely recommend this. And they're great customer service because the first one I ordered got lost by FedEx so they sent me a second one then the second one quit working after I upgraded my power cable from the primary battery to the secondary and they are exchanging it. So it's good all the way around.

Hooked up easy. Looks great and so far works as it should

Product works as expected. I'm satisfied with the purchased of this item.

A must have if you are running a second battery, especially if you are running lithium cells or any secondary battery battery. It can save you the trouble of to dead batteries or overcharging lithium batteries. Pros smart auto connect and disconnect of secondary battery from charging system which isolates it m from other battery. With it disconnected from main battery if somthing pull you voltage down it will not effect the secondary battery. Or trash lithium banks by pulling them down and not being able to charge them back up. Oh it also comes with a thin almost flat switch that you can manually connect both batteries together to jump start yourself. Small Con for some, bit pricey compared to others but still a lot cheaper than replacing a bad battery.