Comment 34 for bug 1482390

It is reproducible:

When the AC adapter is connected and the battery is fully charged:

$ sudo acpitool -a -b
  Battery #1 : Discharging, 100.0%
  AC adapter : online

$ sudo acpitool -B
  Battery #1 : present
    Remaining capacity : 51901 mWh, 100.0%
    Design capacity : 56041 mWh
    Last full capacity : 51901 mWh, 92.61% of design capacity
    Capacity loss : 7.387%
    Present rate : 0 mW
    Charging state : Discharging
    Battery type : Li-ion
    Model number : ASUS