Recently I observed the following on my Thinkpad X230 with Ubuntu 16.04 on it:
When I use the Laptop and the charger is not plugged in, I observe battery drops from around 40% to 5%. It seems like I can use the full charged battery only from 100% to ~40%.
What could be the reason for this? Is there anything I can do about it?
The following screenshots capture the problem.
Thanks in advance!