The LapBook Pro runs on 50% battery life

The last month my LapBook Pro, a year and a half old, shuts down when the battery is at 50%! The screen turns off and the keyboard lights up for another 4-5 minutes. And then everything goes off. So, I can work on a laptop half the usual time - a maximum of 2 hours. Following the percentage of battery charge I noticed it goes off at 50%! When I connect the charger it shows that it is charging at 1%! And it fills up much faster, in an hour and a half. Like I put it to charge at 50% battery charge!
It was upgraded to Windows 11 a few months ago (when Microsoft offered the upgrade).
Is it battery calibration? How do I make it?
Or is it something else?