Ideally, Buchmann says, you should try to keep your [laptop] battery charged from 20 percent to 80 percent. Keep in mind that these are guidelines for ideal use—it's generally inconvenient to unplug your machine before it goes all the way to 100. But even if you're not on constant guard, be mindful of charging your machine constantly, well past when you know it's full. You also should be conscious of letting your battery run all the way to zero.
Try to keep your laptop as cool as possible. The best technique here is to charge up your battery when the computer is turned off. When your laptop is turned on and plugged in, you should pull the battery out of your computer. Yes, pull it out.
More fodder for the advice drawer that will probably need to be cleaned out in 6 months.