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Hello, there is a procedure to follow after replacing the key battery.
Get all the keys for the car that you have that are remote controllers for the central locking also.
Make sure all the doors are unlocked and the front doors are closed
Turn the ignition switch to position I then back to position 0 within 5 seconds
Remove the key from the ignition
Press and hold the unlock button (up to 15 seconds) and whilst holding the unlock button, press the lock button three times (within 10 seconds)
Let go of both buttons
If successful the doors will lock and then unlock
Repeat for each other remote key (max 30 seconds between keys)
I hope this helps you.