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the battery is located under the rear seat cushion on your cadillac deville, to remove the rear seat cushion just pull up on the front of the cushion to release it and pull it forward. you will see the battery and a fuse block.
there are also terminals under the hood that run directly to the battery for jumpstarting but going to the battery itself is the best way. those re-located terminals don't usually work because the amperage has to travel pretty far to get to the battery.
GM puts batteries under the rear seat in some of there cars, including Cadillacs. This is a rather interesting location, and it increases the labor charge to change the battery, as well as making it difficult to find many manufacturers that make one that is compatible.