Cadillac 2007 Escalade EXT Owner's Manual page 96

To replace the battery in this type of RKE
transmitter do the following:
1. Use a flat object with a thin edge into the
notch, located above the metal base, and
separate the bottom half from the top half of
the transmitter.
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2. Remove the old battery, but do not use a
metal object to do this.
3. Slide the new battery into the transmitter with
the positive side of the battery facing up.
Use a type CR2032 battery, or equivalent
type. Make sure the cover is on tightly,
so water will not get in.
4. Snap the front and the back of the transmitter
together.
5. Test the operation of the transmitter with the
vehicle.