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.