incorrect battery design capacity

[Jachym Cepicky <jachym.cepicky@gmail.com>]

Hi, 
if I'm in wrong mailing list, my apologizes, plese point me to the right
one.
 
It is truth, that my laptop is about 3 years old, and so, I can not
expect  miracles from my battery, however, I would call this an bug:

I have HP Compaq nx6125 and on the battery it is written, that it is
10.8V - 4.8 Ahr, which I understand, that capacity of my battery is 4800
mAh. 

However,  cat /proc/acpi/battery/C179/info 
present:                 yes
design capacity:         638 mAh
last full capacity:      638 mAh
battery technology:      rechargeable
design voltage:          11100 mV
design capacity warning: 32 mAh
design capacity low:     7 mAh
capacity granularity 1:  100 mAh
capacity granularity 2:  100 mAh
model number:            Primary
serial number:           03740 2006/01/12
battery type:            LIon
OEM info:                Hewlett-Packard

The last full/design capacity ratio is (after 3 years) impressive. But I
would expect the design capacity little bit (about 7.5x?) higher. 

Is it the bug of acpi? Kernel? Do I have to buy me a new battery?  Can I
set somehow design capacity by hand?

Linux kocour 2.6.27-11-generic #1 SMP Thu Jan 29 19:24:39 UTC 2009 i686
GNU/Linux
Ubuntu 8.10
acpi 1.1

Thanks

Jachym
-- 
Jachym Cepicky
e-mail: jachym.cepicky gmail com
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/pgp/JachymCepicky.pgp