I never knew how bad my batteries were till today.
So, I was sleeping in my room, with my computer on me, because I was listening to music.
And since I didn't want to bring my charger there, I used one battery.
It was at 80% or so.
And when I woke up one hour later, it was around 18%.
And I was on Power Saver.
With my screen down.

At this rate, I'm going to have by new batteries at the end of the year.
I still remember when we first received our tablets, the batteries could last us 18 hours at minimum brightness and Power Saver.