I don't know the answer, but I wanted to comment for those that might not know, this is a side post battery (I assume... I have a '94 which is a side post)
Disconnect the Regal battery cables. Find the battery clamp then remove it. Lift the battery out, then put the new one in. install the clamp, then connect the battery cables.
The battery should be under the back seat, remember to always connect the ground (black or -) to a peice of bare metal that is grounded to your car like the frame, if you don't you risk blowing up your car because of a hydrogen gas released from the battery, remove the Black - ground first to keep from making a spark and connect the ground last.
A 1996 Buick Regal will jump start using a portable battery pack. Another person can also use jumper cables to help jump start another car.
Disconnect the battery, remove the spark plug cables and boots, and remove the old spark plugs. Put in the new spark plugs, attach the boots and cables, and connect the battery.
Disconnect the battery of the car, remove the cables and boot covers, and remove the old spark plugs. Put in the new spark plugs, replace the cables and boot covers, and connect the battery.
THe battery is under the back seat so you have to TAke all theose cables out
There are many pictures available showing how to connect jump cables to a Buick Le Sabre. These pictures can be found in online, in a library, or in an auto manual.
You need another vehicle. Find a friend with a car and ask if he has jumper cables. if they have them they can assist.
Check battery and cables
It is important to replace old spark plugs to keep a car engine running well. To replace them disconnect the battery, remove the cables, remove the old spark plugs, replace with the new spark plugs, replace the cables in the correct order, and connect the battery.
Clean battery terminals, then tighten down the battery cables. With the ignition key---like any other time.
First take the cables off then the hold down then lift the battery out. Clean the battery box with a mixture of soda and water then spray it with WD40 then install the new battery and clean the cables before you reinstall them.