I bought my black macbook off of ebay about a year ago and so far have been pleased with, however a few months after i got it i realized the battery wouldn't last but about 15 to 30 minutes. Now i wasn't to concerned cause i always kept it plugged in. But as i started college i started needing it on campus and not always having a place to plug into and it was essentially unusable. So i bought a brand new battery and have been using it for a couple days. When i got it, i charged it all the way up, let it drain all the way down, then charged it back up full and left it on the charger for well over 2 hours (as that's what apple suggests). But still, my battery seems to be draining VERY quickly. Such as now. I charged it up full before i left for school this morning. In less than 20 minutes on very light web browsing and listening to music, i'm down to 86%. And the other annoying this is i have the time instead of the battery percentage, and the time is bouncing all over the place. It'll start out around 3:15 or so, then 4:05, then 1:45, then 2:30 all in about 2 or 3 minutes. So i'm wondering is there something wrong with my computer? Some setting that needs to be tweaked? Bluetooth is off, wifi on. I'm only running firefox and itunes. I'm also running cee pee you, little snitch, and temperature monitor in the background, however i severely doubt programs as light at those would really affect battery life that much. My second question is completely different. Because my macbook is a little older, i'm still running tiger. I want to put on snow leopard, but i'm wondering, will any of my programs be affected? Basically will have to reinstall any of them? I'll just say, without sounding sinister, i don't want to have to reinstall any programs. haha thanks for any help guys!