The Best and safest way to charge your battery is to jump start the car and let the engine charge the battery. If this is not possible, the following should be useful.
This answer assumes that the battery is still in the car.
How to charge the battery in a 2001 Cadillac DeVille;
1) Start with the ignition off and key out (for the entire charging operation).
2) Open both rear doors (ventilation), remove the rear seat bottom by pulling up on the front edge.
3) Check that the Battery cable bolts are tight and the battery is not leaking.
4) With the charger off and unplugged:
5) Connect the + (usually red) battery charger clamp to the + terminal (bolt) of the Battery.
6)connect the - (usually black) battery charger clamp to a bare metal bolt as far away from the battery and other electronics as possible (I use the seat belt stud).
7) Plug in and/or turn on the battery charger. Check the gage on the charger, if it reads 0 you have a bad connection (or Battery) check your connections and try again.
8) Do not let the battery charge at 15 or more amps for longer than 10 min. it will die. Check the battery every 30 min, if the battery is too hot to touch stop charging and let it cool.
9) Battery chargers vary in the way they say that the battery is charged so I won't be able to tell you how yours works, but when charging is complete, unplug the charger and disconnect its wires from the battery. Replace the back seat bottom and you are done!
Cadillac Man
its under the back seat....
Possibly defective alternator.
The battery is located under the rear seat (passenger side).
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I have a 2000 Deville DTS. The battery is located below the back seat. Just pull up the seat (not back), and you will find the battery.
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Battery is under rear seat. Replace with only the vented correct battery.
The back seat should pop out and your battery and some fuse boxes are under your back seat.
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You