Comment 44 for bug 629258

The issue has arisen because the percentage charge remaining figure has been removed from the menu, and the remaining time displayed now is only a rough estimate based on the current charge of the battery and the unreliable discharge rate.

In your case, the discharge rate is very wrong (0.0072 W), and upower has a heuristic to detect when the hardware isn't working (which is triggered in your case). In this case, the only measurement possible is the percentage charge remaining, which we don't display anymore.

The numbers indicated by your hardware currently suggest you have 6368 hours of charge remaining, which is clearly wrong.