I purchased this item about a year and a half ago when I left a light on in my F-350 pickup and the battery was very dead.  No lights, no clicking when trying to start it.  Nothing.  I was pulled all the way into the garage where the front of the truck was against a wall.  The grill comes up with the hood so there wasn't sufficient room to open the hood and I couldn't put it in neutral to push it back without power.