I will be getting a previous generation MBP soon and will be using it mostly as a desktop replacement. I was wondering a couple of things about MBP battery tho: 1) First of all, when I receive the laptop, how many hours should I charge it before using it for the first time? (Usually, about 9 hrs is recommended, isn't it?) 2) Is there any difference in performance at all, whether the laptop is plugged in, or solely on battery? (Because on my current Toshiba laptop I have a feeling that when on battery, at times laptop's performance is slightly worse than otherwise). 3) What would be the best way to preserve the battery life? Can I keep it in my laptop all the time, even when it is plugged in (when at home), or should I rather keep using up the battery first and then when it's about to run out plug it in? Or will it not really make any difference with either because after all the battery's life expectancy is 2-3 years and will come to an end sooner or later anyway? Thanks in advance.