I think one problem is that the kernel does not propagate the discharge 
information to the /sys architecture.  If I look at 
/proc/acpi/battery/BAT0/state
I can read
present:                 yes
capacity state:          ok
charging state:          charging
present rate:            26018 mW
remaining capacity:      3800 mWh
present voltage:         10637 mV

But the rate is nowhere to be found in /sys/class/power_supply/BAT0/ and
it would appear that the battery applet is looking there now.

This is a Thinkpad T41 I am using, by the way.

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You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is a subscriber of a duplicate bug (38795).
https://bugs.launchpad.net/bugs/629258

Title:
  Battery life estimation never comes around

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