Comment 2 for bug 629258

Marking as invalid for the same reasons as your previous bug:
»The new battery menu (which you should have if you are running Ubuntu Lucid or later) does not have tooltips / mouse over text anymore. Instead it has a menu item directly showing »Laptop battery X hours X minutes left«.

It does not need to estimate anymore, so I’m going to mark this bug as invalid.«

If it occurs nonetheless, you should either update your system or report this upstream to GNOME: https://wiki.ubuntu.com/Bugs/Upstream/GNOME