Your key transponder may be faulty, you would need to take the keys to a dealer and see if they can read the codes from them, if not, the car wont see them either.
If a yellow key symbol is flashing on your dash then this is another indicator of the key failing. If the plip cannot unlock the car either and only the key blade will do it, then the immobiliser may need re-coded to your keys after the battery replacement, or if it has worked since then, and the stopped recently, I would suspect the transponder chip in the key.
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