hey all i just reciently put xp pro on my computer where it had vista home premium ( its an hp dv9428ca) before the battery would last like atleast 3-4 hours now it lasts no more than a hour i know it wasnt the battery because it worked yesterday fine when i had vista on it is there any tips on what i can do to improve the battery life or is there any fixes that i can download that will help optimize it for xp ? another question do i have to re train the battery with installation of a new os?