I've noticed the same with a Dell 1505n running Gutsy. The tooltip popup says
there is 55 min remaining when the battery is at 98%.
Yet if I pull up the Device Information page for it, it correctly shows
"Discharge Time: 5 hours 56 minutes"
** Changed in: Ubuntu
Importance: Undecided => Medium
Status: Unconfirmed => Confirmed
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Laptop Battery Time Remaining Outrageously Inaccurate
https://bugs.launchpad.net/bugs/120258
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