Comment 78 for bug 531190

I think you have multiple problems here. One of them is that either energy-full or energy-full-design is wildly incorrect, resulting in very low % full readings. There's an example above - here's mine. Note that upower (and battery meter), are both reporting 11% left; there's really a lot more than that.

Device: /org/freedesktop/UPower/devices/battery_BAT0
  native-path: /sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0
  vendor: DPONz4516KWDGKMA3123456789ABCDE
  model: bq20z4516KWDGKMA3123456789ABCDE
  power supply: yes
  updated: Tue Apr 19 21:07:33 2011 (12 seconds ago)
  has history: yes
  has statistics: yes
  battery
    present: yes
    rechargeable: yes
    state: discharging
    energy: 75.59 Wh
    energy-empty: 0 Wh
    energy-full: 636.83 Wh
    energy-full-design: 84.5 Wh
    energy-rate: 17.343 W
    voltage: 11.92 V
    time to empty: 4.4 hours
    percentage: 11.8697%
    capacity: 100%
  History (charge):
    1303261653 11.870 discharging
    1303261623 11.893 discharging
    1303261593 11.915 discharging
    1303261563 11.936 discharging
  History (rate):
    1303261653 17.343 discharging
    1303261623 20.442 discharging
    1303261593 15.973 discharging
    1303261563 15.189 discharging