Do iPod batteries need to be calibrated the same as laptop batteries? I do this every month or two with my Macbook. http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh2339.html I have heard to not do so will drastically shorten laptop battery life. Are iPods the same way? Should I charge it all the way and then let it run down and sleep before recharging it again?