Hi, I have a SONY VAIO VGN-SZ760N running Windows XP Service Pack 3.
I have done my best to avoid the dreaded memory effect with my battery. At first, I unplugged the computer as much as possible to use battery only so that the battery didn't get used to having power all the time. Then, I read that the best way to combat the effect was to just remove the battery and use direct power whenever possible, so I did that for a while.
Still, my battery has stopped lasting to its full potential. When I charge it (no matter for how long), it only goes up half way.
it lasts for about 2 hours.
There's a little switch on my computer (a physical switch above the keyboard) that says "Stamina/Speed" and I always keep it on "Speed." Not sure if that is important.