I have done some research on this problem and come across an informative 
discussion on this problem on a Debian-related mailing list:
http://www.mail-archive.com/debian-eeepc-de...@lists.alioth.debian.org/msg01135.html

What I got from this is:

The Eee pc's battery does not adhere to ACPI standards in reporting its
capacity, returning a percentage in a field which is specified as having
the unit mAh. Linux (ACPI driver, I guess) exports the percentage value
of capacity in mAh in /proc/acpi/battery (and possibly elsewhere), which
leads into problems in anything that uses it.

So where should this be fixed? Given that this has slim chance of
happening in Eee pc's BIOS and no chance of everyone even upgrading to
that unlikely new BIOS version, I would say the next best place would be
just one step up the ladder -- in Linux ACPI driver -- because if this
would be fixed (only) in devicekit-power, other processes that don't
rely on dk-p, e.g. manually cat'ing /proc/acpi/battery/BAT0/info, would
still return erroneous results.

-- 
power manager reports 1% battery even though it is full
https://bugs.launchpad.net/bugs/403303
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