How "observant" of you;-)! Somewhere in this car is a microscopic draw on the battery. Until I can track it down I thought a disconnect would save the battery. I do have a good trickle charger and I will keep that hooked up but I was thinking safer than sorry if I am on a trip and don't have an outlet available, not to mention one more security device....although, one would probably NOT be able to hotwire this car very easily if at all.