Pontiac 2007 Solstice Owner's Manual page 64

Battery Replacement
Under normal use, the battery in the remote keyless
entry transmitter should last about four years.
If the battery is weak the transmitter will not work
within its normal range. It is probably time to
change the battery if you have to be very close to
the vehicle before the transmitter works.
Notice: When replacing the battery, use care
not to touch any of the circuitry. Static
from your body transferred to these surfaces
may damage the transmitter.
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To replace the battery do the following:
1. Insert a flat object with a thin edge into the
notch, located below the trunk release
button, and pry the front and back apart.
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.
4. Snap the front and the back of the transmitter
together.
5. Test the operation of the transmitter with the
vehicle.