Hi I need help with my battery charging

[Microsoft Windows]

I'm lowkey panicking but I just bought my laptop two days ago and everything was going well but just today my laptop hasn't been charging properly. At first it stayed on 80% but when I took the charger off and put it back on it went down to 79% and now it has been on 79% for an hour and I have restarted my laptop and everything but still nothing. The battery life is also meant to be 6 hours but when it was at 97% yesterday the laptop said it was expected to go flat in 2 hours.

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