Battery Life

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Well, if you use less power it will charge faster and the battery will last longer, of course. Depending on the laptop you can adjust the monitor brightness or the performance (I think that just slows down the processor). You can also tell it to shut off the monitor or hd after a period, but that won't do you any good while you're using it. If it is still under warrantee and the performance didn't always suck, you can try to get the battery replaced. Keep in mind that the warrantee of the battery will be shorter (mine is 1 year), as they are expected to fail after a while.