Review on Efficient Battery Saver: Koolatron F70110 12V in Sleek Black Design by Paul Sanchez

That should be a standard SUV buying issue! This should already be a built-in function. If you are reading this review you are the target market to buy this. I use this extensively for long distance and night riding in my Honda Element. During the day it helps me make ice cream in my 12v freezer and at night it helps me warm up the car with a 12v heater without worrying about draining the car battery. When I wake up in the morning after a cold night and use my heater, I make sure that my battery has enough charge in the morning so that I can start the engine. Inverter to charge my laptop with it worry-free. Operation is simple: chain this to whatever you have powered from your always-on 12V plug. If you drain the battery down to around 11V, your accessories will be de-energized. The light changes from green to red when you are too low.