DIY: Save Your Battery: Unplug Your Laptop

That's my tip of the day. Once fully charged, an additional supply of electricity does more harm that good. So be sure to "pull the plug" once you are done charging. And that goes for batteries in cell phone, electric shavers and other electronic gadgets.

For the science - you can read this article from a researcher at Lawrence Berkeley National Lab:

http://thisweekinbatteries.blogspot.com/2010/02/pull-plug-your-battery-will-thank-you.html