I bought s10lite on 11th nov 2020 , I faced this problem while registering my finger print & today suddenly my finger print sensor stop working...now after doing this & that it has started.its really not expected

my s10 lite mobile battery is draining so fast, yesterday I bought this phone today It completed fully charged at 4am after that I have very little used.now its 6.30pm , battery is 50% what to do? do I ask to change my phone or is this normal ?