I unpacked my new MacBook only 2 days ago and it showed 9-10 hours of battery life (as advertised). I didn't calibrate it, since it is no longer necessary (I was told).
Today I noticed that it started to show only 4 hours of battery life with 98% charge. I am a student and it shows me these stats when I run nothing - I am not editing photos, watching movies, etc. I only had I tab in a browser (Chrome) opened.
Do you know, why is that? Should I check with Apple if my battery is somehow faulty?
I am a first time MacBook owner.