Charging issue for corebook x

I have purchased my corebook x i3 12th gen laptop 2 days before. i ave charged it fully once but in second time charging it taking so much times that feels horrible. what can i do? should i replace it?

also i want to add that if i listen to music in full volume theres a beep sound coming out of it when the bass hits. why is that?

Where did you buy it ?

Is it new or used ?