I have problems with my Dell E6410 running 11.04 Natty Narwhal. I
noticed some strange values for BAT0 (I have BAT1 but not installed).
The following were from when my computer's battery was fully charged and
on AC power:

$ cat /sys/class/power_supply/BAT0/charge_full
8061000
$ cat /sys/class/power_supply/BAT0/charge_now 
8400000
$ cat /sys/class/power_supply/BAT0/charge_full_design 
8400000

Device: /org/freedesktop/UPower/devices/battery_BAT0
  native-path:          
/sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0
  vendor:               SMP
  model:                DELL HJ59002
  serial:               6061
  power supply:         yes
  updated:              Tue Nov 29 14:48:33 2011 (631 seconds ago)
  has history:          yes
  has statistics:       yes
  battery
    present:             yes
    rechargeable:        yes
    state:               fully-charged
    energy:              93.24 Wh
    energy-empty:        0 Wh
    energy-full:         93.24 Wh
    energy-full-design:  93.24 Wh
    energy-rate:         2.997 W
    voltage:             13.038 V
    percentage:          100%
    capacity:            95.9643%
    technology:          lithium-ion

$ upower -v
UPower client version 0.9.9
UPower daemon version 0.9.9

So may battery says it has 100% charge, but that it is no longer capable
of 100% charge (capacity = 95.9643%). The battery charge indicator in
Gnome (classic) displays what looks like a critical battery icon (red
battery outline), but the drop-down menu lists "Laptop battery is
charged." Sometimes I will get an indicator that the battery is critical
as soon as I unplug AC power, at which time it will hibernate.

It seems like there is some error when it receives values with
charge_now > charge_full. Does anyone else with this problem see similar
values?

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https://bugs.launchpad.net/bugs/531190

Title:
  upower (devkit-power) reporting bad data when AC cable is unplugged

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