battery discharging too fast

[Nenhum _de_Nos]

i'd like to know if anyone has ever seen something like this, my
laptop when using FreeBSD (now running 6.2-PRERELEASE) jumped from
100% to 60% in less than 40s !

the hardware is ok, when running windows it lasts what is expected.

also always had this huge jump when get close to 30% (this from 100%
was the first time).

more details, i was running a cpu intense program at full speed and
moved the laptop from my bedroom to the kitchen. it was fully charged
and droped that much.

it is a Toshiba Tecra M3 notebook.

thanks

matheus

-- 
We will call you cygnus,
The God of balance you shall be