João, I have the same situation you describe on my Dell Mini 9. So in my
opinion, there are currently two issues:

* g-p-m has no estimates about the remaining battery *time*. This seems to be 
because of lacking ACPI information, if I understood it correctly. This could 
be solved by calculating these estimates in g-p-m, but this is probably not 
trivial.
* The second issue is how the battery indicator deals with this situation. 
Currently, it simply shows “estimating…” forever, but never comes around with 
estimated values. I think if it cannot get the remaining battery *time*, it 
should resort to displaying the battery *charge* (percentage). This is probably 
much easier to implement and would give at least any usable value, instead of 
the useless “estimating…”. And, if I recall correctly, this was the behavior in 
Lucid.

So if it is not possible to resolve the issue of getting the time
estimates in the short term, I’d suggest to resort to the values that
*are* available (as the charge percentage).

-- 
Battery life estimation never comes around
https://bugs.launchpad.net/bugs/629258
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