read this about 800mhz battery probhttp://notebookforums.com/showthread.php?t=31027
The problem with the m680x series is not os related, but BIOS. The min and max throttle settings for cpu stay at %40 for min and max on battery power, but as soon as you give it a/c power you've got min at %40 and max at %100.
So... those of you talented enough to edit the bios, try to edit only the min and max throttle under battery power also the voltage changes so that they are lower, and we're in business!
I don't think it would take too much battery for following reasons:
when operating at 800mhz things take a little longer to process
when on dynamic throttling things are processes faster so in theory battery time does go down but you aren't spending it waiting for the cpu to process things but rather the battery time you waste isn't spent waiting for things to happen.
Just like driving a car faster or slower on the freeway, drive around 60MPH and you get great gas mileage but it takes you a long time to get there. Go 100+ miles an hour gas mileage goes down the toilet (spending extra money on gas) but you get there %40 percent faster.