On the back seat in order to lift it off to get to your battery all you have to do is pop the seat off. Get your hands under the seat from the sides and lift upward the back seat will pop. Make sure you do this on both sides.
its under the back seat
In my 2000 LeSabre, it's under the back seat. Remove the rear seat and I'll bet it's there.
its under the back seat
the battery is under the back seat
Underneath the back seat of the car. I was surprised!!
It's located under the back seat.
Under the back seat
As odd as this sounds check under the back seat. My brother has a new model Lesabre and he had to take the seat part of the back seat out to change his battery.
Answerunder the back seat
It's the guy in the trench coat in the back seat ;)
its under the back seat on the passenger side
unbolt it