Asus battery replacement

Hello everyone, I just submitted my phone zenfone max pro m1 to the service centre today for my battery replacement and I've been told to go and get the phone in the evening. I wanted to know that can I ask them to give me the old battery so that I can keep it to myself or will it not be allowed by them?
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Comments
you can ask them to give your old battery but my sugg was let it be with them they will recycle it so that it doesn't go to landfill