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
It's located under the back seat.
Underneath the back seat of the car. I was surprised!!
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
its under the back seat on the passenger side
It's the guy in the trench coat in the back seat ;)
To remove the back seat from a 2005 Buick LeSabre, start by locating the two release levers or bolts at the base of the seat cushion. Pull the levers or remove the bolts to release the cushion from its clips. Then, lift the seat cushion up and out of the car. For the seatback, check for any bolts or clips at the bottom and remove them before tilting the seatback forward and lifting it out.