Yes but whatever you do make sure it's fused. A lighter outlet on your car
is of course at the car's fuse panel and you can also use a type of lighter
plug that contains a fuse but if you're doing anything involving direct
connection to a car or other similarly large battery use some kind of in-
line fuse holder. A car battery can put out a huge amount of current in a
short, enough to melt small gauge wire and there's always the possibility
of a hydrogen explosion at the battery.