I have had my 2007 outlook for about 18 months. I was looking under the hood recently and noticed the absence of a battery. I saw the positive cable attached to the fuse box and noticed that it goes straight down from there. I don't know where it is but it is undoubtedly underneath the vehicle. I suppose this is another GM trick to keep you using GM service departments. Another post I read says that if the battery goes dead, the ignition key locks up in the on position and cannot be removed. It amazes me how many tricks and gimmicks car manufacturers can come up with to try to keep you coming back to the dealership to be fleeced.