The same issue happens in Hardy and I think this bug is present since
2006 (see also bug #159407, opened on 2007, and marked as invalid
because of lacking of info).

1) I start the PC  with battery plugged in:
"
ma...@dominus:/proc/acpi/ac_adapter/ACAD$ cat state 
state:                   off-line
ma...@dominus:/proc/acpi/ac_adapter/ACAD$ cat ../../battery/BAT1/state 
present:                 yes
capacity state:          ok
charging state:          discharging
present rate:            1574 mA
remaining capacity:      879 mAh
present voltage:         10730 mV
"

2) I hibernate the PC
3) I unplug the battery and I plug-in in the ac-power
4) I startup the PC
5) 
"
ma...@dominus:/proc/acpi/ac_adapter/ACAD$ cat ../../battery/BAT1/state 
present:                 yes
capacity state:          ok
charging state:          charged
present rate:            0 mA
remaining capacity:      0 mAh
present voltage:         0 mV

ma...@dominus:/proc/acpi/ac_adapter/ACAD$ cat state 
state:                   on-line
"

You will see that at last the ac-power is recognized as on-line (and this is 
ok) but also the battery is recognized as present (and this is not ok). 
The gnome-power-manger plugin still shows battery icon even if, if you move the 
mouse cursor over the icon, you can read that the PC is running with ac-power 
and the battery state cannot be read at that moment. 

The same issue, but obviously in the opposite way, happens if you start,
at first, the PC with ac-power and then, after hibernation, you plug-in
the battery and you unplug ac-power.

** Changed in: gnome-power-manager (Ubuntu)
       Status: Invalid => New

-- 
After hibernate: Battery not correctly recognized/displayed in Panel applet
https://bugs.launchpad.net/bugs/73750
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