I just wondered if and how one can check the actual, fully charged battery capacity on a Linux notebook compared to the design value. Turns out to be very simple:
cobra@mini:~$ acpitool -B Battery #1 : present Remaining capacity : 1870 mAh, 85.00% Design capacity : 2200 mAh Last full capacity : 2200 mAh Present rate : 0 mA Charging state : discharging Battery type : rechargeable, Lion Serial number : 11
Seems that the battery on my Mini is still in good shape. :) The above reading, by the way, was taken after running the little thing for more than an hour on battery.